2,151 results on '"Air drying"'
Search Results
152. Improved Procedure for Natural Convection Garlic Drying
- Author
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Aissa Amari, Azzedine Mazari, Amor Bouhdjar, Sofiane Elmokretar, Mohamed Semiani, Hakim Semai, and Amal Boukadoum
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0106 biological sciences ,Natural convection ,Materials science ,Mechanical Engineering ,Agriculture (General) ,Airflow ,Evaporation ,effective diffusivity ,Residual moisture ,04 agricultural and veterinary sciences ,Solar drying ,040401 food science ,01 natural sciences ,S1-972 ,0404 agricultural biotechnology ,010608 biotechnology ,stepwise increasing temperature ,Lower cost ,Air drying ,free convection airflow ,Composite material ,solar drying ,Waste Management and Disposal ,Agronomy and Crop Science ,Water content - Abstract
Vegetable drying is an energy consuming procedure despite the fact that it is the most efficient way to preserve agricultural products. This study investigates a new way to dry good quality garlic at lower cost. Thin garlic layer was submitted to free convection airflow at air drying temperature of 40 °C, 50 °C, and 60 °C. Using the slope method, effective diffusivity coefficient was determined at each drying temperature during the first and second falling drying rate periods. Considering the former, it increased with increasing temperature. In relation to latter, it decreased with the temperature increase. However, at low drying temperatures, process keeps on going to very low moisture content; and it develops to an asymptotic value at high temperatures, indicating that shrinking at high temperature prevents evaporation of some residual moisture. Considered separately, these temperatures do not reflect the conditions met in solar drying, since in solar systems, air temperature increases during the day with increasing solar radiation. Therefore, characterization of garlic drying by means of step temperature varying – the first hour of drying at 40 °C; the second hour of drying at 50 °C, and the remaining time of drying at 60 °C – might better correspond with conditions under solar drying and result in better understanding of the process.
- Published
- 2020
153. Air drying kinetics and quality characteristics of osmodehydrated-candied pumpkins using alternative sweeteners
- Author
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Andriana E. Lazou, Magdalini Krokida, Maria C. Giannakourou, and Stamatina Katsoufi
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Materials science ,General Chemical Engineering ,Kinetics ,Low calorie ,04 agricultural and veterinary sciences ,02 engineering and technology ,040401 food science ,0404 agricultural biotechnology ,020401 chemical engineering ,Air drying ,Food science ,0204 chemical engineering ,Physical and Theoretical Chemistry ,Quality characteristics ,Osmotic dehydration - Abstract
In order to obtain nutritious, low calorie candied pumpkins, of superior quality, air drying kinetics of pretreated pumpkin slices were investigated using three different drying temperatures (40, 6...
- Published
- 2020
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154. Stress simulation and cracking prediction of corn kernels during hot-air drying
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Pengxiao Chen, Weijun Xie, Shuo Wei, Bo Xiao, Fenghe Wang, and Deyong Yang
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0106 biological sciences ,Materials science ,General Chemical Engineering ,04 agricultural and veterinary sciences ,040401 food science ,01 natural sciences ,Biochemistry ,Lower temperature ,Endosperm ,Stress (mechanics) ,Cracking ,0404 agricultural biotechnology ,010608 biotechnology ,von Mises yield criterion ,Air drying ,Relative humidity ,Composite material ,Moisture gradient ,Food Science ,Biotechnology - Abstract
A moisture-heat transfer and stress model of corn kernels based on multi-component heterogeneity was developed and verified to predict the stress cracking during hot-air drying. Simulated results showed that the moisture gradient and von Mises stress of each corn component simulated by the verified model increased first and then decreased, where the von Mises stress in the outer layer of corn kernels was larger than that in the inner layer. The maximum von Mises stress of each corn component increased with the increase of drying temperature and the decrease of relative humidity. The stress cracks were mainly formed in hard endosperm and soft endosperm, because the maximum von Mises stress of hard endosperm was larger than the yield stress of the two components, which were agreement with statistical results of stress cracks. Therefore, a drying operation with lower temperature and higher relative humidity is beneficial for inhibiting the stress cracking in corn kernels.
- Published
- 2020
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155. EXPERIMENTAL AND NUMERICAL STUDY OF CONVECTIVE HOT AIR DRYING OF CIRCULAR SHAPED CASSAVA PELLETS
- Author
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Nwadike Emmanuel Chinagorom, Azaka Onyemazuwa Andrew, Enibe Sammuel Ogbonna, and Achebe Chinonso Hubert
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Convection ,Materials science ,Pellets ,Air drying ,Composite material - Published
- 2020
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156. Multivariate analyses of the volatile components in fresh and dried turnip (Brassica rapa L.) chips via HS-SPME–GC–MS
- Author
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Chun-ju Liu, Jia-Heng Li, Dajing Li, Qi Gao, Hao-Ting Han, Jia-Hui Zhang, Chunquan Liu, and You-Lin Xue
- Subjects
0106 biological sciences ,04 agricultural and veterinary sciences ,040401 food science ,01 natural sciences ,Hexanal ,Freeze-drying ,chemistry.chemical_compound ,0404 agricultural biotechnology ,chemistry ,010608 biotechnology ,Brassica rapa ,Principal component analysis ,Air drying ,Food science ,Gas chromatography–mass spectrometry ,Food Science - Abstract
Turnip is a vegetable that has many health promoting effects. To diversify the usage and increase the consumption of turnip, the effects of hot air drying, infrared drying, explosion puff drying and freeze drying (FD) on the volatiles of turnip chips were studied. The volatiles of fresh turnip and dried turnip chips were isolated by HS-SPME–GC–MS and a total of 67 volatiles were identified. However, the volatiles in turnip chips dried by different methods are quite different. Based on principal component analysis and hierarchical cluster analysis, the volatiles of fresh turnip were distinguished from those of the dried chips and FD was separated from the other drying methods. As the result of orthogonal projection on latent structure-discriminant analysis (OPLS-DA), isothiocyanato-cyclopropane and (2-isothiocyanatoethyl)-benzene were identified as the characteristic volatiles of fresh turnip. While, 2-azido-2,3,3-trimethyl-butane and hexanal were identified as the characteristic volatiles for FD dried chips.
- Published
- 2020
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157. Removal of Air-Drying Artifact of Papanicolaou Stained Smears with Normal Saline and Fresh Frozen Plasma
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Lata Lata, Manju Kumari, Rashmi Arora, and Sachin Kolte
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Pathology ,medicine.medical_specialty ,Pap smears ,medicine.diagnostic_test ,business.industry ,medicine.medical_treatment ,Papanicolaou stain ,Staining ,Fine-needle aspiration ,medicine ,General Earth and Planetary Sciences ,Air drying ,Fresh frozen plasma ,business ,Saline ,General Environmental Science ,Fixation (histology) - Abstract
Background Papanicolaou stained (Pap) smears in fine needle aspiration cytology play an important role for studying chromatin details of the cells and also ensures its optimal resemblance with the cell nuclei on histological sections. The conventional Pap Stained smears are ethanol fixed before drying. But delay in fixation due to any reason results in drying artifacts in the stained smears making it an inept smear for further examination. Aims & objectives: To study the role of rehydration fluid for removal of air drying artifact. Material and methods: Fifty fine needle aspiration smears from different organs with drying artifact in Pap Stained smears were included in the study. The smears were destained, rehydrated with rehydrating fluid for two hours and were restained with Pap stain after fixation with 95 % alcohol. Results : Smears treated with this solution showed reversal of the air drying artifact with better nuclear details and background material staining. Conclusion: Rehydration of destained Pap smears with rehydrating fluid followed by restaining results in optimal staining of the nuclear and background details preventing the material loss and making the smears appropriate for staining.
- Published
- 2020
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158. Comparison of the sowing, harvesting and antioxidant properties of seeds and seedlings of a giant field moth (Agrostis gigantea Roth) after air drying and thermal dehydration
- Author
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Valery N. Zelenkov, Аnatoly А. Lapin, Agroecology Williams, Vyacheslav V. Lаtushkin, Aromatic Plants, and Vladimir M. Kosolapov
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Environmental Engineering ,Antioxidant ,Field (physics) ,Chemistry ,medicine.medical_treatment ,food and beverages ,Sowing ,Agrostis gigantea Roth ,medicine.disease ,Industrial and Manufacturing Engineering ,Horticulture ,medicine ,Air drying ,Dehydration - Abstract
The study of the biological characteristics of feed crops and the use of modern methods in the study of the processes of their selection is relevant for the intensification of feed production. The article presents the results of a biochemical study of the giant VIK-2 (Agrostis gigantea Roth) field birch seed, their sowing and yield properties after thermal dehydration (drying of air-dried samples at 105 oС to constant weight), as well as their total antioxidant activity during germination in the dark. The total antioxidant activity of seeds and seedlings was studied using coulometric analysis and determined using electrogenerated bromine, the samples were analyzed on a certified couponometer Expert-006 (LLC Econix-Expert, Russia) using a certified method. The work shows that, compared with air drying after thermohydration, there is a decrease in the viability and yield properties of seeds. Seed germination decreased by 5.5%, the height of plants at the end of the germination period (on the 14th day after sowing) by 9.4%, the mass of 100 sprouts – by 21.3%, the yield of green mass (microgreen) also by 21.3%. The antioxidant activity of seeds after thermal dehydration also decreased by 21.4%. For the first time, data were obtained on the viability, formation of microgreen biomass and a change in the total antioxidant activity of the seeds of the VIK-2 giant cultivar after thermal dehydration (drying the initial seeds) in the test at 105 °C to constant weight. It was shown that thermal dehydration of seeds at 105 °C significantly affects the viability of seeds and seedlings of a bent field, which is associated with the characteristics of metabolism, forms and state of water activity in cells and tissues of plants.
- Published
- 2020
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159. Parboiled rice production without steaming by microwave-assisted hot air fluidized bed drying
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Somkiat Prachayawarakorn, Thanit Swasdisevi, Somchart Soponronnarit, and Eleeyah Saniso
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0106 biological sciences ,Materials science ,Starch ,General Chemical Engineering ,Microwave power ,Boiler (power generation) ,Steaming ,04 agricultural and veterinary sciences ,Pulp and paper industry ,040401 food science ,01 natural sciences ,Biochemistry ,Microwave assisted ,chemistry.chemical_compound ,0404 agricultural biotechnology ,chemistry ,010608 biotechnology ,Air-fluidized bed ,Air drying ,Tempering ,Food Science ,Biotechnology - Abstract
Since the traditional parboiled rice process requires a high-pressure boiler and contains several processing steps, this work therefore proposes a new method of producing parboiled rice with no requirement of steam and fewer processing steps. With the proposed technique, a microwave-assisted hot air fluidized bed dryer (MWFB) was used. The Suphanburi 1 variety of paddy was first soaked in hot water and then dried by MWFB at temperatures of 111-169 °C and a fixed microwave power of 2 W/g wet paddy. The experimental results show that having the microwave turned on continuously for 180 s from the beginning of the drying process enhanced the rate of drying only when the drying rate was in the first falling rate period and could help to gelatinize the starch near the core of kernel, where it is very difficult to achieve gelatinization by hot air drying alone. During the MWFB drying process, the A-type crystalline structures decreased whilst V-type amylose-lipid complexes were formed. The amount of head rice yield, redness (a*-value), and yellowness (b*-value) increased whilst the lightness (L*-value) decreased during drying. To preserve the good head rice quality of the parboiled rice, the drying of the soaked paddy was not allowed to fall below 22–24% d.b. and the tempering step after drying was necessary.
- Published
- 2020
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160. Behavior of a portable solar dryer for pineapple fiber Comportamento de um secador solar para fibras de abacaxi
- Author
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Róger Moya and Marco Solano
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Secagem no ar ,humidade relativa ,teor de humidade ,temperatura ,radiação solar ,Air drying ,relative humidity ,moisture content ,temperature ,solar radiation ,Agriculture (General) ,S1-972 - Abstract
In Costa Rica, there has been a growing interest to use pineapple fiber from plant, for which current processes need to be improved or new processes need to be developed, with emphasis on drying methods. This work presents the design and evaluation of the behavior of a prototype portable solar dryer in four sites of Costa Rica. The design describes the main parts of the dryer, as well as how they were constructed. The behavior was evaluated according to temperature and relative humidity inside e outside the chamber, and the influence of direct and indirect solar radiation. In order to achieve improved dryer efficiency, a dehumidifier was used to control relative humidity, and a heating system was implemented during the hours of low temperature, low solar radiation and high relative humidity. Based on drying time, final moisture content of fibers of pineapple leaves from plant, and the varying hours when fibers were put to dry, the evaluation of the dryer revealed that the best fiber-drying interval is from 6h00 to 14h00, and after that, it is convenient to inject hot air and use a dehumidifier in the dryer in order to increase its efficiency.Na Costa Rica, o interesse pelo uso da fibra proveniente da folha de abacaxizeiro. Tem almentado e essa atividade precisa de melhoramento ou implementação de novos processos para alcançar maior eficiência, principalmente na secagem da fibra. O presente trabalho apresenta o design e comportamento de uma protótipo portátil de secadora solar em 4 sites geográficos da Costa Rica. Estão descritas as principais partes do secador, bem como a metodologia de construção. O comportamento foi avaliado de acordo com a temperatura e umidade relativa interna e externa da câmara e a influencia da radiação direta e indireta. Com a finalidade de melhorar a eficiência da secadora, foi usado um desumidificador para controlar a umidade relativa e ainda um sistema de aquecimento durante as horas de baixa temperatura e baixa radiação solar e nos períodos de alta umidade relativa. Foram avaliados o tempo de secagem, o teor de umidade final das fibras e a variação das horas que as fibras são colocadas no secador. O intervalo do dia onde apresenta as melhores condições para secagem é de 6h até 14h. Após essa hora, é conveniente acrescentar ar quente e/ou desumidificador dentro do secador para aumentar sua eficiência.
- Published
- 2012
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161. Effects of Processing and Storage Conditions on Functional Properties of Powdered Blueberry Pomace
- Author
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Calabuig-Jiménez, Laura, Hinestroza-Còrdoba, Leidy Indira, Barrera Puigdollers, Cristina, Seguí Gil, Lucía, and Betoret Valls, Noelia
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waste recovery ,TECNOLOGIA DE ALIMENTOS ,Environmental effects of industries and plants ,Renewable Energy, Sustainability and the Environment ,air drying ,Geography, Planning and Development ,TJ807-830 ,fruit by-products ,milling ,antioxidant properties ,Management, Monitoring, Policy and Law ,TD194-195 ,Renewable energy sources ,Environmental sciences ,GE1-350 - Abstract
[EN] Promoting a circular economy through valorisation of food processing waste into functional ingredients is a challenge today. The combination of hot air drying with milling is a cheap and highly available option for obtaining powdered products from blueberry pomace, a residue with a large amount of fibre and a high proportion of polyphenols from the fruit. The objective of this work was to analyse the effect of drying temperature (60 degrees C and 70 degrees C) and granulometry (coarse and fine) on physicochemical properties, including antioxidant properties and monomeric anthocyanins content. The potential prebiotic effect of blueberry pomace powders, as well as their water and oil interaction properties, were also assessed. Stability of physicochemical properties over 20 weeks of storage was also evaluated. Powders obtained showed a total fibre content higher than 30% with a good proportion between insoluble and soluble fractions and a high retention of monomeric anthocyanins from fresh pomace (75% at 60 degrees C and 66% at 70 degrees C). The powders showed good water interaction properties and interesting technological properties, such as solubility and hygroscopicity, which were not affected by differences in particle size. Stability of powders' physicochemical properties was evidenced throughout the storage period., This researchwas funded by GENERALITAT VALENCIANA, grant number AICO/2017/'049.
- Published
- 2022
162. SECADO DE UCHUVA (Physalis peruviana L) POR AIRE CALIENTE CON PRETRATAMIENTO DE OSMODESHIDRATACIÓN DRY GOOSEBERRY (Physalis peruviana L) WITH PRETREATMENT OF OSMOTIC DEHYDRATION
- Author
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Adriana M CASTRO, Ligia RODRÍGUEZ, and Edgar M VARGAS
- Subjects
Secado por aire caliente ,uchuva (Physalis peruviana L) ,β-caroteno ,deshidratación osmótica ,cinética ,Air drying ,cape gooseberry (Physalis peruviana L) ,undefined-carotene ,osmotic dehydration ,kinetic ,Food processing and manufacture ,TP368-456 ,Pharmaceutical industry ,HD9665-9675 - Abstract
En este trabajo se determinan las condiciones de temperatura más favorables para un proceso de secado de uchuva (Physalis peruviana L) con aire caliente, con deshidratación osmótica (DO) como pretratamiento, utilizando una solución de sacarosa de 70o Brix a 40oC durante 16 horas. Se realiza un seguimiento de la degradación de β-caroteno con el tiempo y la temperatura. En la fruta tratada con aire caliente a 60oC y pretratada con DO, se obtiene una pérdida total de β-caroteno del 98%. La fruta tratada con aire caliente a 40 oC y sin DO, presenta la menor pérdida total de β-caroteno, la cual alcanza un 28%. Los tiempos de secado para alcanzar una humedad de la fruta cercana a 2,5% base seca son de 7, 9 y 12 horas a 60, 50 y 40oC respectivamente, para las frutas tratadas sin DO. Para las frutas tratadas con DO, los tiempos de secado son de 4, 5 y 6 horas a 60, 50 y 40ºC respectivamente. La cinética de degradación encontrada es de primer orden. El estudio de estimación de costos de proceso de secado encuentra que la mejor condición de proceso es a 60oC y sin el tratamiento de DO, con un costo aproximado de procesamiento de $374,42/Kg de fruta.This study find the air temperatures for dehydrating Cape gooseberry, (Physalis peruviana L), with osmotic dehydration as a pretreatment, using a solution of sucrose of 70 o Brix to 40 oC by 16 hours. The highest level of β-carotene degradation, 98%, due to the effects of oxygen, temperature and provitamin lixiviation, takes place with the pretreated fruits, which dry at 60ºC. Lixiviation contributes to 80% of this. The fruits without pretreatment and dry at a temperature of 40ºC suffer a lower level of β-carotene degradation, 28%. The times for the untreated fruit, to reach a moisture level close to 2.5%, decrease as the air temperature increase (40, 50 y 60ºC, 12, 9 and 7 hours respectively). In the case of the pretreated fruit, the drying times are 4, 5, and 6 hours for 60, 50 y 40ºC respectively. Degradation kinetic is first order. The economic study find that the cost for dehydrating at 60°C for the untreated fruit was the most suitable with an approximately cost of $374.42/Kg of fruit.
- Published
- 2008
163. Investigation of moisture distribution and drying kinetic in noncentrifugal cane sugar during hot‐air drying using LF‐NMR
- Author
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Xie Caifeng, Li Yarong, Jianbin Li, Tongquan Wen, Kai Li, and Meng Lidan
- Subjects
Moisture distribution ,Materials science ,biology ,General Chemical Engineering ,Air drying ,General Chemistry ,Cane ,Kinetic energy ,Sugar ,Pulp and paper industry ,biology.organism_classification ,Food Science - Published
- 2021
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164. Design of apple snacks – A study of the impact of calcium impregnation method on physicochemical properties and structure of apple tissues during convective drying.
- Author
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Casim, Silvina, Romero-Bernal, Angela Rocío, Contigiani, Eunice, Mazzobre, Florencia, Gómez, Paula Luisina, and Alzamora, Stella Maris
- Subjects
- *
APPLE cider , *SNACK foods , *CALCIUM , *SUSTAINABILITY , *NATURAL disasters , *ATMOSPHERIC pressure , *GLASS transitions , *ALMOND - Abstract
Calcium impregnation methods (at atmospheric pressure, AI, or under vacuum, VI) followed by air drying at 60 °C were used for producing healthy apple snacks. This study compared the effect of the impregnation method on the ultrastructure features and physicochemical properties (desorption isotherm, density, porosity and shrinkage, thermal transitions, rheological behaviour, colour) of fortified apples along convective drying. Calcium concentration in AI and VI dried apples were ≈ 3600 and ≈ 5200 ppm respectively, which implied, considering a portion of dried apple of 50 g, 18% and 26% of the recommended intake for adults. Calcium incorporation did not affect the desorption behaviour but induced browning of apple tissues. Drying resulted in a great increase in porosity of AI samples and a noticeable compaction of the VI tissues. Impregnated tissues at a w ≤ 0.47 exhibited distinctive mechanical properties: AI apples were characterized by very high stiffness and lower resistance to rupture, while VI apples appeared stronger and moderately stiff. This study will help to develop large-scale commercial production of calcium fortified apple snacks with distinctive characteristics. High quality and content of nutrients, easy industrialization and storage and a long shelf life are important aspects of these healthy snacks. They constitute a valuable functional shelf-stable product, that also can help feeding the population during natural disasters and wars, as well as reducing food insecurity in vulnerable groups as part of the diet. On the other hand, the use of apples not meeting the organoleptic requirements for direct consumption, or not processed into juice, drink, or cider as raw material, looks of particular interest for diversifying the production within the framework of sustainable production. • Healthy apple snacks can be formulated by calcium impregnation before drying step. • Calcium impregnation method affects apple structure and physicochemical properties. • Calcium incorporation induces browning of dried apple. • Calcium do not modify apple desorption isotherms but changes glass transition. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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165. Thermochemical and physical evaluation of poplar genotypes as short rotation forestry crops for energy use.
- Author
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Monedero, Esperanza, Hernández, Juan José, Cañellas, Isabel, Otero, Jose María, and Sixto, Hortensia
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- *
SHORT rotation forestry , *FAST growing plants , *RENEWABLE energy sources , *PARTICLE size distribution , *THERMOCHEMISTRY , *ENERGY crops - Abstract
Short rotation plantations of fast-growing species provide a promising way to produce heat and electricity from renewable sources. The thermo-chemical and physical properties of different genotypes of poplar in short rotation forestry crops grown at three locations with different climatic and edaphic characteristics as well as planting density, have been determined in order to characterize the most appropriate biomass in terms of energy potential. The planting density was 6666 or 13,333 trees/ha (depending on the location) in a rotation of three-four years and the analysis was carried out at the end of the first rotation. For all the genotypes, experimental tests to quantify the moisture content, particle size distribution, bulk density, heating value, ash content and composition as well as the volatile matter were performed. In addition, natural air drying of biomass (stem and branches) was studied in two locations with the aim of determining the humidity loss during raw storage. A significant effect of the genotype and the planting density on the biomass properties was observed. The results obtained indicate that ‘Monviso’ and ‘Viriato’ are the most suitable genotypes. No operational problems related to ash fouling and deposition in combustion devices are expected for any of the genotypes studied. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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166. Determination of bulk density of Mirabelle plum during hot air drying as influenced by ultrasound-osmotic pretreatment.
- Author
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Dehghannya, Jalal, Gorbani, Rasoul, and Ghanbarzadeh, Babak
- Abstract
Prunes are generally produced by drying fresh plums with a stream of hot air. Changes in various quality indicators, such as bulk density of foodstuffs, have substantial impact on the performance of drying processes. Optimization of bulk density is, therefore, a requirement for development and perpetuity of drying technologies. The aim of this study was to investigate the effect of ultrasound-assisted osmotic dehydration pretreatment on bulk density of Mirabelle plum at various operating conditions (sonication time, concentration of osmotic solution and immersion time in the osmotic solution). Results showed that application of ultrasound-assisted osmotic dehydration, compared to control sample, led to a significant (p < 0.05) increase in bulk density from 1.33 to 9.90 %. Experimental data of bulk density variations versus dimensionless moisture content were well fitted to an empirical power model with high R. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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167. Characteristics of apple juice and sugar infused fresh and frozen blueberries.
- Author
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Akharume, Felix U., Singh, Kaushlendra, and Sivanandan, Litha
- Subjects
- *
APPLE juice , *FROZEN blueberries , *OSMOREGULATION , *FOOD storage , *MOISTURE content of food - Abstract
Use of apple juice concentrate and standard sugar-based osmotic solution were compared during osmotic dehydration (OD) of fresh and frozen blueberries for solid gain and water loss. Additionally, fresh and frozen blueberries were characterized for moisture desorption using a thermo-gravimetric analyzer (TGA) at an isothermal temperature of 105 °C under dry nitrogen condition. Weight loss-time data generated from the TGA was used to calculate the overall liquid diffusion coefficient during moisture desorption. Results showed that the use of apple juice concentrate as an osmotic solution increased sugar concentration of frozen blueberries to 30.30 °Brix, which was similar to that obtained from the use of sugar-based osmotic solution (32.90 °Brix). Additionally, irrespective of the osmotic solution type, the osmotically dehydrated frozen blueberries reached the desired safe water activity (a w ) range (0.40–0.50) in the 600 min drying time during follow-up drying at 74 °C. Moisture desorption characterization using TGA showed that fresh blueberries took about 53% additional drying time compared to frozen blueberries. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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168. Improved shelf life of dried Beauveria bassiana blastospores using convective drying and active packaging processes.
- Author
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Mascarin, Gabriel, Jackson, Mark, Behle, Robert, Kobori, Nilce, and Júnior, Ítalo
- Subjects
- *
BEAUVERIA bassiana , *ENTOMOPATHOGENIC fungi , *FOOD dehydration , *SHELF-life dating of food , *VITAMIN C - Abstract
The yeast form (blastospore) of the dimorphic insect-pathogenic fungus Beauveria bassiana can be rapidly produced using liquid fermentation methods but is generally unable to survive rapid dehydration processes or storage under non-refrigerated conditions. In this study, we evaluated the influence of two convective drying methods, various modified atmosphere packaging systems, and storage temperatures on the desiccation tolerance, storage stability, and virulence of blastospores of B. bassiana ESALQ 1432. All blastospore formulations were dried to <5 % water content equivalent to a < 0.3. The viability of B. bassiana blastospores after air drying and spray drying was greater than 80 %. Vacuum-packaged blastospores remained viable longer when stored at 4 °C compared with 28 °C with virtually no loss in viability over 9 months regardless the drying method. When both oxygen and moisture scavengers were added to sealed packages of dried blastospore formulations stored at 28 °C, viability was significantly prolonged for both air- and spray-dried blastospores. The addition of ascorbic acid during spray drying did not improve desiccation tolerance but enhanced cell stability (∼twofold higher half-life) when stored at 28 °C. After storage for 4 months at 28 °C, air-dried blastospores produced a lower LC and resulted in higher mortality to whitefly nymphs ( Bemisia tabaci) when compared with spray-dried blastospores. These studies identified key storage conditions (low a and oxygen availability) that improved blastospore storage stability at 28 °C and will facilitate the commercial development of blastospores-based bioinsecticides. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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169. Effect of Temperature on the Drying Behavior and Quality of Citrus Peels.
- Author
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Marey, Samy and Shoughy, Mohamed
- Subjects
- *
FRUIT drying , *FRUIT quality , *TEMPERATURE effect , *CITRUS , *FRUIT skins , *ENERGY consumption - Abstract
The effects of the drying temperature and the residual moisture content on the drying behavior, energy consumption and quality of dried citrus peels (CPs), which are value-added food ingredients, were studied. The CP samples were dried in a laboratory-scale hot-air dryer at air temperatures from 40 to 70 °C under a constant air velocity of 1 m/s until the desired moisture content for safe storage was reached or until the final moisture level was achieved for the specific drying conditions. Cakes prepared from blends containing different proportions (0 %, 10 %, 15 % and 20 %) of dried CPs were also evaluated for chemical composition and sensory attributes. The optimal drying temperatures were 50-60 °C, and the optimal moisture content was 10±0.2 % w.b.; these conditions reduced the drying time and energy consumption and maximized the product quality. In contrast, over-drying CPs with the higher temperatures and to a final moisture level of 5.4±0.2 % sharply increased the loss of vitamin C, carotenoids as antioxidants and essential oils. Incorporation of 15 % dried orange and mandarin peels in cake formulas increased the dietary fiber by 33.5 % and 29.6 %, the crude fat by 2.9 % and 4.6 % and the ash by 30.6 % and 29.0 %, respectively, whereas the protein and total carbohydrate content decreased slightly. Highly acceptable nutritious cakes could be obtained by incorporating 15 % orange or mandarin peel dried to 10 % w.b. moisture content into the formulation. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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170. Tillandsia stricta Sol (Bromeliaceae) leaves as monitors of airborne particulate matter-A comparative SEM methods evaluation: Unveiling an accurate and odd HP-SEM method.
- Author
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de Oliveira, Martha Lima, de Melo, Edésio José Tenório, and Miguens, Flávio Costa
- Abstract
Airborne particulate matter (PM) has been included among the most important air pollutants by governmental environment agencies and academy researchers. The use of terrestrial plants for monitoring PM has been widely accepted, particularly when it is coupled with SEM/EDS. Herein, Tillandsia stricta leaves were used as monitors of PM, focusing on a comparative evaluation of Environmental SEM (ESEM) and High-Pressure SEM (HPSEM). In addition, specimens air-dried at formaldehyde atmosphere (AD/FA) were introduced as an SEM procedure. Hydrated specimen observation by ESEM was the best way to get information from T. stricta leaves. If any artifacts were introduced by AD/FA, they were indiscernible from those caused by CPD. Leaf anatomy was always well preserved. PM density was determined on adaxial and abaxial leaf epidermis for each of the SEM proceedings. When compared with ESEM, particle extraction varied from 0 to 20% in air-dried leaves while 23-78% of particles deposited on leaves surfaces were extracted by CPD procedures. ESEM was obviously the best choice over other methods but morphological artifacts increased in function of operation time while HPSEM operation time was without limit. AD/FA avoided the shrinkage observed in the air-dried leaves and particle extraction was low when compared with CPD. Structural and particle density results suggest AD/FA as an important methodological approach to air pollution biomonitoring that can be widely used in all electron microscopy labs. Otherwise, previous PM assessments using terrestrial plants as biomonitors and performed by conventional SEM could have underestimated airborne particulate matter concentration. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
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171. Estimation of total, open-, and closed-pore porosity of apple slices during drying.
- Author
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Wang, Dandan and Martynenko, Alex
- Subjects
- *
FRUIT drying , *FLUID dynamic measurements , *POROSITY , *HEAT convection , *CONVECTIVE flow , *MOISTURE , *VOLUME (Cubic content) , *MOLECULAR volume , *VOLUME measurements - Abstract
The purpose of this research was to develop an approach for porosity estimation in the process of convective air drying. Fresh apple slices were exposed to 80°C drying to equilibrium moisture content 0.2 g/g. Porosity at different stages of drying was estimated using three approaches: (1) direct volume and mass measurements, (2) pycnometer measurements, and (3) theoretical model. All three approaches were in good agreement in the range of moisture contents above 1.0 g/g. However, at moisture contents below 0.26 g/g, significant deviation of pycnometer measurements from both experimental estimates and theoretical model was observed. This difference could be explained by transformation of open pores into closed pores due to glass transition phenomenon. This study presents an example of separate quantitative estimation of total, open-, and closed-pore porosity. [ABSTRACT FROM PUBLISHER]
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- 2016
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172. Neglected grass species of Southern Africa: Nutritive value of conserved Hyperthelia dissoluta harvested at different growth stages.
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GUSHA, JACOB, CHAMBWE, TONDERAI, MUGABE, PRISCA H., HALIMANI, TINYIKO E., KATSANDE, SIMBARASHE, and MASOCHA, MHOSISI
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GERMINATION ,FORAGE plants ,SILAGE ,GRASS silage ,FIELD crops - Abstract
Copyright of Tropical Grasslands / Forrajes Tropicales is the property of International Centre for Tropical Agriculture - CIAT and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2016
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173. Shrinkage of Mirabelle Plum during Hot Air Drying as Influenced by Ultrasound-Assisted Osmotic Dehydration.
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Dehghannya, Jalal, Gorbani, Rasoul, and Ghanbarzadeh, Babak
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MIRABELLE plum , *DRYING agents , *MOISTURE content of food , *ULTRASONICS , *DEHYDRATION reactions - Abstract
Convective drying in hot air is still the most popular method applied to reduce the moisture content of fruits and vegetables. Conventional hot-air drying of Mirabelle plum is considered to be a slow and energy intensive process. This is due to the fact that the waxy skin of Mirabelle plum has low permeability to moisture, a fact which results in high shrinkage. The aim of this study was to investigate the effect of ultrasound-assisted osmotic dehydration pretreatment on shrinkage of Mirabelle plum as a function of moisture content with the end goal of optimizing operating conditions that minimize shrinkage of the produce during drying. Results showed that application of ultrasound-assisted osmotic dehydration led to a significant (p< 0.05) decrease in shrinkage (from 76.41 to 64.05%). A linear relation between moisture loss and shrinkage was observed. Results indicated that shrinkage may be easily estimated from changes in moisture content, and independent of the drying rate. Inversely, determination of shrinkage would provide an indirect indication of moisture content. [ABSTRACT FROM PUBLISHER]
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- 2016
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174. Research on the drying kinetics of household food waste for the development and optimization of domestic waste drying technique.
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Sotiropoulos, A., Malamis, D., Michailidis, P., Krokida, M., and Loizidou, M.
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DRYING ,FOOD industrial waste ,SEWAGE ,ORGANIC wastes ,GREEN technology - Abstract
Domestic food waste drying foresees the significant reduction of household food waste mass through the hygienic removal of its moisture content at source. In this manuscript, a new approach for the development and optimization of an innovative household waste dryer for the effective dehydration of food waste at source is presented. Food waste samples were dehydrated with the use of the heated air-drying technique under different air-drying conditions, namely air temperature and air velocity, in order to investigate their drying kinetics. Different thin-layer drying models have been applied, in which the drying constant is a function of the process variables. The Midilli model demonstrated the best performance in fitting the experimental data in all tested samples, whereas it was found that food waste drying is greatly affected by temperature and to a smaller scale by air velocity. Due to the increased moisture content of food waste, an appropriate configuration of the drying process variables can lead to a total reduction of its mass by 87% w/w, thus achieving a sustainable residence time and energy consumption level. Thus, the development of a domestic waste dryer can be proved to be economically and environmentally viable in the future. [ABSTRACT FROM PUBLISHER]
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- 2016
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175. Drying characteristics and processing optimization of combined microwave drying and hot air drying of Termitomyces albuminosus mushroom
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Wei Haixiang, Liu Jing, Zhao Min, Yanmin Yang, Li Xiangli, Jinxiu Cai, and Xue Liping
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Mushroom ,Materials science ,Termitomyces albuminosus ,General Chemical Engineering ,Air drying ,General Chemistry ,Pulp and paper industry ,Microwave ,Food Science - Published
- 2021
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176. Effect of freezing and radiofrequency pretreatments on quality and kinetics of convective air‐drying of potatoes
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Dalal Albosharib, Hossein Jooyandeh, Mohammad Noshad, and Hassan Zaki Dizaji
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Convection ,Quality (physics) ,Materials science ,General Chemical Engineering ,Kinetics ,Air drying ,General Chemistry ,Pulp and paper industry ,Food Science - Published
- 2021
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177. Mathematical Modeling of Air Impingement Drying of the Brown Algae Sargassum muticum (Fucales)
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Pascal Morançais, Virginie Boy, Jean-Louis Lanoisellé, Jeanne Le Loeuff, Nathalie Bourgougnon, Thibaut Colinart, Laboratoire de Biotechnologie et Chimie Marine (LBCM), Laboratoire de Biotechnologie et Chimie Marines (LBCM), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
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0106 biological sciences ,biology ,Chemistry ,General Chemical Engineering ,[SDV]Life Sciences [q-bio] ,04 agricultural and veterinary sciences ,General Chemistry ,biology.organism_classification ,040401 food science ,01 natural sciences ,Industrial and Manufacturing Engineering ,Brown algae ,0404 agricultural biotechnology ,010608 biotechnology ,Environmental chemistry ,Air drying ,Sorption isotherm ,Sargassum muticum ,Fucales ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
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- 2021
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178. Effect of steam, microwave, and hot‐air drying on antioxidant capacity and in vitro digestion properties of polyphenols in oat bran
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Yakun Zhang, Jing Zhang, Chen Wang, Meili Zhang, Yuanyuan Zhang, and Xue Bai
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Antioxidant capacity ,Chemistry ,Polyphenol ,General Chemical Engineering ,Oat bran ,Air drying ,General Chemistry ,Food science ,In vitro digestion ,Microwave ,Food Science - Published
- 2021
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179. Vis-NIR Hyperspectral Imaging for Online Quality Evaluation during Food Processing: A Case Study of Hot Air Drying of Purple-Speckled Cocoyam (Colocasia esculenta (L.) Schott)
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Ayub Njoroge Gitau, John Ndisya, Duncan O. Mbuge, Liliana Badulescu, Barbara Sturm, Elke Pawelzik, Arman Arefi, and Oliver Hensel
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Multispectral image ,Bioengineering ,Feature selection ,570 Biologie ,TP1-1185 ,phenolic compounds ,Chemometrics ,non-invasive measurements ,Quality (physics) ,ddc:570 ,water activity ,Chemical Engineering (miscellaneous) ,Air drying ,QD1-999 ,Hue ,Remote sensing ,Mathematics ,moisture content ,structural morphology ,CIE L*a*b ,Process Chemistry and Technology ,Chemical technology ,browning index ,rehydration ratio ,Hyperspectral imaging ,Colocasia esculenta ,Chemistry ,antioxidants ,shrinkage - Abstract
In this study, hyperspectral imaging (HSI) and chemometrics were implemented to develop prediction models for moisture, colour, chemical and structural attributes of purple-speckled cocoyam slices subjected to hot-air drying. Since HSI systems are costly and computationally demanding, the selection of a narrow band of wavelengths can enable the utilisation of simpler multispectral systems. In this study, 19 optimal wavelengths in the spectral range 400–1700 nm were selected using PLS-BETA and PLS-VIP feature selection methods. Prediction models for the studied quality attributes were developed from the 19 wavelengths. Excellent prediction performance (RMSEP <, 2.0, r2P >, 0.90, RPDP >, 3.5) was obtained for MC, RR, VS and aw. Good prediction performance (RMSEP <, 8.0, r2P = 0.70–0.90, RPDP >, 2.0) was obtained for PC, BI, CIELAB b*, chroma, TFC, TAA and hue angle. Additionally, PPA and WI were also predicted successfully. An assessment of the agreement between predictions from the non-invasive hyperspectral imaging technique and experimental results from the routine laboratory methods established the potential of the HSI technique to replace or be used interchangeably with laboratory measurements. Additionally, a comparison of full-spectrum model results and the reduced models demonstrated the potential replacement of HSI with simpler imaging systems.
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- 2021
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180. Effects of ultrasound and blanching pretreatments on mass transfer and qualities of hot‐air drying of perilla ( Perilla frutescens L.) leaves
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Jiaoling Wang, Weidong Song, Ding Tianhang, Xiaotong Ma, and Chunfang Song
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Perilla frutescens ,biology ,Chemistry ,Blanching ,General Chemical Engineering ,Mass transfer ,Air drying ,General Chemistry ,Food science ,Perilla ,biology.organism_classification ,Food Science - Published
- 2021
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181. Hot Air Drying Characteristics and Quality Analysis of Ginger (Zingiber Officinale): Effect of Pretreatment and Process Intermittency
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Prasanta Majumder, Rajat Gupta, Laxman Mishra, and Abhijit Sinha
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law ,Chemistry ,Intermittency ,Scientific method ,Air drying ,Zingiber officinale ,Pulp and paper industry ,law.invention - Published
- 2021
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182. A Minimally Morphologically Destructive Approach for DNA Retrieval and Whole-Genome Shotgun Sequencing of Pinned Historic Dipteran Vector Species
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Alex Makunin, Matthew Mayho, Petra Korlević, Erica McAlister, Mara K. N. Lawniczak, and Paul Flicek
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AcademicSubjects/SCI01140 ,Mosquito Vectors ,Biology ,Genome ,chemistry.chemical_compound ,Low salt ,Lysis buffer ,Genetics ,Air drying ,historic DNA ,Ecology, Evolution, Behavior and Systematics ,Shotgun sequencing ,Diptera ,AcademicSubjects/SCI01130 ,museum genomics ,High-Throughput Nucleotide Sequencing ,DNA ,Genomics ,Sequence Analysis, DNA ,DNA extraction ,chemistry ,Evolutionary biology ,Vector (epidemiology) ,Research Article ,disease vectors - Abstract
Museum collections contain enormous quantities of insect specimens collected over the past century, covering a period of increased and varied insecticide usage. These historic collections are therefore incredibly valuable as genomic snapshots of organisms before, during, and after exposure to novel selective pressures. However, these samples come with their own challenges compared with present-day collections, as they are fragile and retrievable DNA is low yield and fragmented. In this article, we tested several DNA extraction procedures across pinned historic Diptera specimens from four disease vector genera: Anopheles, Aedes, Culex, and Glossina. We identify an approach that minimizes morphological damage while maximizing DNA retrieval for Illumina library preparation and sequencing that can accommodate the fragmented and low yield nature of historic DNA. We identify several key points in retrieving sufficient DNA while keeping morphological damage to a minimum: an initial rehydration step, a short incubation without agitation in a modified low salt Proteinase K buffer (referred to as “lysis buffer C” throughout), and critical point drying of samples post-extraction to prevent tissue collapse caused by air drying. The suggested method presented here provides a solid foundation for exploring the genomes and morphology of historic Diptera collections.
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- 2021
183. Development of an Optimized Drying Process for the Recovery of Bioactive Compounds from the Autumn Fruits of Berberis vulgaris L. and Crataegus monogyna Jacq
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Luigi Menghini, Corneliu Tanase, Gianina Crișan, Oleg Frumuzachi, Carla Pereira, Lillian Barros, Andrei Mocan, Stefania Cesa, Maria Inês Dias, Alexandru Gavan, Cadmiel Moldovan, Cristian Radu Sisea, Isabel C.F.R. Ferreira, and Mihai Babotă
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drying process optimization ,Physiology ,DPPH ,Drying process optimization ,Clinical Biochemistry ,Crataegus monogyna ,antioxidant activity ,RM1-950 ,Biochemistry ,Article ,Berberis vulgaris ,chemistry.chemical_compound ,barberry ,Antioxidant activity ,Barberry ,Air drying ,Food science ,Molecular Biology ,Folk medicine ,biology ,Chemistry ,Hawthorn ,Autumn fruits ,Cell Biology ,Barberry Extract ,biology.organism_classification ,hawthorn ,Antioxidant capacity ,Scientific method ,Therapeutics. Pharmacology ,autumn fruits - Abstract
Hot air drying has proven to be an efficient method to preserve specific edible plant materials with medicinal properties. This is a process involving chemical, physical, and biological changes in plant matrices. Understanding these processes will lead to an improvement in the yields of bioactive compounds. This study aims to optimize the drying process of two species’ fruits used in folk medicine, Berberis vulgaris and Crataegus monogyna. The optimized extracts’ antioxidant capacity was assessed using various assays, with the barberry extract showing very good activity (50.85, 30.98, and 302.45 mg TE/g dw for DPPH, TEAC, and FRAP assays, respectively). Both species exerted good fungal α-glucosidase inhibitory activity (IC50 = 0.34 and 0.56 mg/mL, respectively) but no activity on mammalian α-glucosidase. Additionally, this study identified and quantified the main bioactive compounds. The results presented herein are a breakthrough in industrializing this drying process. Additional studies are necessary to mechanistically understand the drying process involved in these plant materials. This work was supported by a grant of the Romanian Ministry of Education and Research, CNCS–UEFISCDI, project number PN-III-P2-2.1-PED-2019-5360.The authors are grateful to the Foundation for Science and Technology (FCT; Portugal) for financial support through national funds FCT/MCTES to CIMO (UIDB/00690/2020), the national funding for F.C.T. and P.I. and through the institutional scientific employment program contract for M.I.D., and L.B. The authors are grateful to FEDER—Interreg España—Portugal programme for financial support through the project TRANSCoLAB 0612_TRANS_CO_LAB_2_P. info:eu-repo/semantics/publishedVersion
- Published
- 2021
184. Electrohydrodynamic drying: Can we scale-up the technology to make dried fruits and vegetables more nutritious and appealing?
- Author
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Alex Martynenko, Daniel I. Onwude, Thijs Defraeye, and Kamran Iranshahi
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Technology ,Dried fruit ,bepress|Engineering ,engrXiv|Engineering|Chemical Engineering ,convective drying ,food quality ,01 natural sciences ,7. Clean energy ,0404 agricultural biotechnology ,bepress|Engineering|Mechanical Engineering|Manufacturing ,Vegetables ,Air drying ,Desiccation ,Process engineering ,EHD drying ,scalability ,engrXiv|Engineering|Manufacturing Engineering ,novel thermal drying ,plant-based foods ,2. Zero hunger ,bepress|Engineering|Bioresource and Agricultural Engineering ,business.industry ,Nutritional content ,010401 analytical chemistry ,bepress|Engineering|Chemical Engineering ,04 agricultural and veterinary sciences ,040401 food science ,0104 chemical sciences ,Freeze Drying ,engrXiv|Engineering|Bioresource and Agricultural Engineering ,engrXiv|Engineering ,Fruit ,SCALE-UP ,Environmental science ,Electrohydrodynamics ,Food quality ,business ,Food Science - Abstract
Electrohydrodynamic (EHD) drying is a promising technology to better preserve the nutritional content and sensory appeal of dried fruits and vegetables. To successfully scale up this technology, we need to rethink the current EHD dryer designs. There is also a significant potential to further enhance the nutritional content and sensory quality of the dried products by optimizing EHD process parameters. This study particularly highlights the current bottlenecks in scaling up the technology and improving nutrient retention and sensory appeal of the dried products. We discuss plausible future pathways to further develop the technology to produce highly nutritious dried products. Particular emphasis has been given to quantifying the residual nutritional and sensory properties of EHD dried products, and possible EHD dryer configurations for farmers and the industry. Concerning the nutritional content, EHD drying preserves vitamins, carotenes, and antioxidants significantly better than convective air drying. From the sensory perspective, EHD drying enhances the color of dried products, as well as their general appearance. With respect to scalability, placing the fruit on a grounded mesh electrode dries the fruit much faster and more uniformly than the grounded plate electrode. Future research should be directed toward simultaneous measurements of multiple food nutrients and sensory properties during EHD drying with a grounded mesh collector. Quantifying the impact of the food loading density on drying kinetics and energy consumption of the EHD drying process should also be a future research goal. Research comparing EHD drying with commercially available drying methods such as freeze-drying, microwave-drying, and infrared drying should also be carried out. This study gives promising insight toward developing a scalable novel thermal drying technology tailored to the requirements of the current and future society., Comprehensive Reviews in Food Science and Food Safety, 20 (5), ISSN:1541-4337
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- 2021
185. Fluorescence Properties of the Air- and Freeze-Drying Treatment on Size-Fractioned Sediment Organic Matter
- Author
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Chi-Ying Hsieh, Yung-Yu Liu, Wei-Shiang Huang, Cheng-Wen Chuang, and Ting-Chien Chen
- Subjects
Technology ,QH301-705.5 ,QC1-999 ,optical indicators ,complex mixtures ,Freeze-drying ,Dissolved organic carbon ,General Materials Science ,Organic matter ,sediment humic substances ,Biology (General) ,Instrumentation ,QD1-999 ,Fluid Flow and Transfer Processes ,chemistry.chemical_classification ,Pollutant ,Total organic carbon ,air drying ,Process Chemistry and Technology ,Physics ,General Engineering ,Sediment ,Engineering (General). Civil engineering (General) ,Humus ,humanities ,Computer Science Applications ,Chemistry ,chemistry ,Wastewater ,Environmental chemistry ,freeze-drying ,TA1-2040 ,size-fractioned - Abstract
Sediment humic substance (SHS) is a highly heterogeneous and complex organic mixture with a broad molecular weight range. It is the significant component that associates distribution, transport, and biotoxicity of pollutants in a river environment. Air- and freeze-drying sediment pre-treatment may cause different biological activity and may result in different chemical quantities and sediment organic matter. This study collected sediments that received livestock wastewater discharge. The sediments were air- (AD) and freeze-dried (FD). The dried sediment organic matter was extracted with an alkaline solution and separated into three size-fractioned SHS samples. Size-fractioning is an effective method used to differentiate materials, on a molecular level. The bulk solution (<, 0.45 μm) was designated as BHS, and size-fractioned solutions were identified as LHS (<, 1 kDa), MHS (1–10 kDa), and HHS (10 kDa-0.45 μm). The AD SHS had a lower dissolved organic carbon (DOC) concentration than the FD SHS for the bulk and individual size-fractioned SHS, but the AD and FD SHS had a similar distribution of organic carbon in the size-fractioned SHS. The AD SHS had higher aromaticity (SUVA254) and an extent of humification (HIX) than the FD SHS. In addition, the high molecular weight SHS (HHS) had a higher SUVA254 but lower HIX than the MHS and LHS. The HHS had significantly lower fulvic acid but had higher humic acid-like substances than the MHS and LHS. This is possibly the reason the LHS had a higher humification degree but lower aromaticity than HHS. The size-fractioned SHS and optical indicators distinguished the difference between the chemical properties when air- or freeze-dried, due to the different degree of biological activities.
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- 2021
186. Hot air drying characteristics of Cardiospermum halicacabum leaves
- Author
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J. Jony Blessing Manoj, J. Prakash Maran, and S. Abitha
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010302 applied physics ,Materials science ,biology ,Moisture ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Thermal diffusivity ,Cardiospermum halicacabum ,biology.organism_classification ,Moisture ratio ,Cardiospermum ,01 natural sciences ,Horticulture ,Drying time ,0103 physical sciences ,Air drying ,0210 nano-technology ,Mora - Abstract
In this present study, influence of various temperatures (40–60 °C) on drying characteristics such as moisture ratio (MORA), drying rate (DYR) and moisture diffusivity (EMOD) of Cardiospermum helicacabum leaves were investigated using hot air drying method. Outcomes exhibited that, drying was occurred in falling rate period and enhancing temperature leads to elevate the drying characteristics as well as shorten the drying time. At higher temperature (60 °C), loss of moisture from leaves was occurred while comparing with other temperatures and shortens the time of drying. Similarly, EMOD was also increased with enhancement in temperature which indicates the quick diffusion process was takes place at higher temperature. Modified page model was precisely fit with observed drying data.
- Published
- 2021
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187. Storage studies of dried carnation flowers
- Author
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PK Nagre, SM Wararkar, and SR Dalal
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Desiccant ,biology ,Borax ,Silica gel ,fungi ,Randomized block design ,Carnation ,biology.organism_classification ,chemistry.chemical_compound ,Horticulture ,chemistry ,Post graduate ,Air drying ,Mathematics - Abstract
The present experiment entitled “Effect of desiccants on drying of carnation flower was carried out during the academic years 2015-16 and 2016-17 at Department of Horticulture, Post Graduate Institute, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola to find out suitable desiccant for drying for carnation flower. The experiment was laid out in Randomized Block Design with four replications. The treatments comprised of six different drying methods viz. Air drying under shade (control), drying after embedding in borax, clean fine sand, silica gel, 1:1 glycerol: water and 1:3, 1:1 glycerol: water. Embedded drying in silica gel scored maximum scores for extent of colour fading at 60, 150 and 180 days after drying during storage, whereas minimum scores were recorded in treatment of air drying under shade. With respect to incidence of pest and diseases scores of flowers during storage at 60, 150 and 180 days after drying, treatment silica gel embedded drying scored maximum points whereas minimum scores and maximum damage by pests and diseases were recorded in treatment in air drying under shade treatment.
- Published
- 2020
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188. Influence of Drying Rate on Hot Air Drying Processing of Fresh Foods Using Pulsed Electric Field
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Junichi Kamagata, Takahiro Yamada, Takahiro Orikasa, Hitoshi Aoki, Katsuyuki Takahashi, Kouya Yamakage, and Koichi Takaki
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Materials science ,Electric field ,Moisture permeability ,Air drying ,Electrical and Electronic Engineering ,Composite material - Published
- 2020
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189. Effects of combined microwave-hot-air-drying on the physicochemical properties and antioxidant activity of Rhodomyrtus tomentosa berry powder
- Author
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Haiyu Luo, Guanghe Zhao, and Congying Hu
- Subjects
Rhodomyrtus tomentosa ,Antioxidant ,Mildew ,biology ,Chemistry ,General Chemical Engineering ,medicine.medical_treatment ,010401 analytical chemistry ,Significant difference ,04 agricultural and veterinary sciences ,Berry ,biology.organism_classification ,040401 food science ,01 natural sciences ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,0404 agricultural biotechnology ,medicine ,Air drying ,Food science ,Safety, Risk, Reliability and Quality ,Microwave ,Food Science - Abstract
Rhodomyrtus tomentosa berries are rich in nutrition, but easily mildew, so it is necessary to dry them with a proper drying technique in time. The effects of the combined microwave-hot-air-drying (CD) on the physicochemical and antioxidant properties of Rhodomyrtus tomentosa berry powder were evaluated in this study, compared with those of hot air drying (HD) and microwave drying (MD). The results showed that the hydration properties and oil holding capacity of CD-berry powder were better than those of HD- and MD-ones. However, CD-berry powder showed lower fillibility and liquidity than HD-one and but similar to MD-one. There was no significant difference among the thermal stability of berry powder produced by the three drying methods. Furthermore, CD was beneficial to maintain the color, nutrition, and active ingredients of Rhodomyrtus tomentosa berry powder. CD-berry powder and MD-one had similar antioxidant properties. In general, CD is more suitable for the processing of Rhodomyrtus tomentosa berry powder.
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- 2020
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190. ALLEVIATING CHILLING INJURY OF OLIVE DURING COLD STORAGE BY SAFE COMPOUNDS AFTER HARVEST
- Author
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N. A. Abd-Ghany, Karim M. Farag, Eman M. Shukry, Neven M.N. Nagy, and Laila F. Hagag
- Subjects
0106 biological sciences ,Chemistry ,Cold storage ,04 agricultural and veterinary sciences ,040401 food science ,01 natural sciences ,chemistry.chemical_compound ,Horticulture ,0404 agricultural biotechnology ,Cold store ,Postharvest ,Putrescine ,Relative humidity ,Air drying ,Chilling injury ,Cultivar ,010606 plant biology & botany - Abstract
Recently, there has been a great concern about increasing the yield and storage of many olive cultivars in Egypt and countries around the world. However, there is a lack of storage facilities to reduce the losses of olives. This study provide some safe treatments after harvest to extend the cold storage of olives, while reducing or mitigating the chilling injury of stored fruits. Treatments were done by dipping fruits of each used cultivar, namely Manzanillo and Toffahi in one of the treatment solutions which were, the control (water), Naphthalene Acetic Acid (NAA) at 100 or 200 ppm, Lisophos (LPE) at 200 or 400 ppm, putrescine at 1 or at 2 mM, in addition to benzyladenine (BA) at either 100 or 200 ppm. After dipping for 20 min, olives were left for air drying at room temperature (22 ± 2°C ) in foam plates, then stored in the cold store at (5 ± 1°C) and relative humidity of 95 %. Each solution contained the surfactant called Tween 20 at 0.05% (V/V). After each cold storage duration olives were left for 24 hrs on the bench at room temperature to warm up before assessing the physiological and chemical characteristics of fruits of each treatment. The results revealed that putrescine - treated fruits had higher chlorophyll content especially at 2 mM. Similar trend of results was obtained with LPE at 200 ppm or BA at 200 ppm. Meanwhile, there was a significant reduction of electrolyte leakage following the cold storage periods, especially with LOE at 400 ppm or putrescine at 1 mM when compared with the control. This study recommended dipping olive fruits after harvest and prior cold storage in Lisophos at 200 or 400 ppm or in putrescine solution at 1 mM to prolong the cold storage life and to reduce the injury of stored olives, while reducing their loss of quality.
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- 2020
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191. Experimental study of wet porous sand layer air-drying characteristics
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Yingke Zhang, Jingchun Min, and Yicun Tang
- Subjects
Moisture content ,Convection ,Materials science ,Biot number ,Convective heat transfer ,020209 energy ,Temperature ,Evaporation ,02 engineering and technology ,General Energy ,020401 chemical engineering ,Air drying ,Heat transfer ,ddc:330 ,Wet sand layer ,0202 electrical engineering, electronic engineering, information engineering ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,0204 chemical engineering ,Composite material ,Porosity ,lcsh:TK1-9971 ,Water content ,Layer (electronics) ,Lumped parameter analysis - Abstract
An experimental study has been carried out to investigate the convective air-drying characteristics of a wet sand layer. The experimental setup allows dynamic measurements of both sand layer weight and temperature, with hot air flowing towards the sand layer surface to ensure a uniform drying of it. Experiments are conducted for a 4 mm thick sand layer for three air temperatures of 45, 60 and 75 °C. The lumped parameter method is used to analyze the sand layer heat transfer. The results show that the sand layer temperature continuously increases throughout the drying process, which can be divided into three stages, i.e. the initial rapid, intermediate slow, and final rapid increase stages. There is no constant temperature stage that is often observed in water film evaporation experiment. The drying process can also be divided into three stages according to the sand layer drying rate variation, they are the increasing, constant, and decreasing rate stages, which roughly correspond to the three temperature rise stages. The lumped parameter analysis result supports that the convective heat from the hot air is used mainly for the water evaporation. Keywords: Wet sand layer, Air drying, Temperature, Moisture content, Lumped parameter analysis, Biot number
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- 2020
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192. The metabolic formation profiles of macamides accompanied by the conversion of glucosinolates in maca (Lepidium meyenii) during natural air drying
- Author
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Yang Wanlin, Hong Li, Jin‐Liang Shao, Zhang Shaozhi, Zhen‐Yuan Ruan, Pu Hongmei, and Yang Fang
- Subjects
0404 agricultural biotechnology ,Lepidium meyenii ,Chemistry ,010401 analytical chemistry ,Air drying ,04 agricultural and veterinary sciences ,Food science ,040401 food science ,01 natural sciences ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,Food Science - Abstract
During the natural air drying process of maca, the content of total glucosinolates decreased significantly in the first two months of drying, accompanied by the mass synthesis of macamides. Two kinds of glucosinolates and most of the known classes of macamides have the same two benzyl‐dependent functional groups. The result suggest that natural air drying is the most suitable condition for the formation of macamides, and these two glucosinolates are the most important kinds of precursors of macamides.
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- 2020
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193. Optimization of hot air drying process of corn using genetic algorithm and response surface methodology
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Zhe Liu, Junyi Chen, Wenfu Wu, Yi Jin, and Rongmin Cheng
- Subjects
lcsh:TP368-456 ,business.industry ,variation temperature ,010401 analytical chemistry ,Humidity ,lcsh:TX341-641 ,04 agricultural and veterinary sciences ,optimization process ,040401 food science ,01 natural sciences ,drying simulation ,0104 chemical sciences ,lcsh:Food processing and manufacture ,0404 agricultural biotechnology ,Scientific method ,Genetic algorithm ,variation humidity ,genetic algorithm ,Environmental science ,Air drying ,Response surface methodology ,Process engineering ,business ,lcsh:Nutrition. Foods and food supply ,Food Science - Abstract
To study the effect of temperature and humidity on the drying indexes and quality indexes of corn and to optimize the corn drying process, an orthogonal experiment of hot air drying with variable temperature and humidity was designed. The drying process of the actual dryer was simulated by taking the gradient of hot air temperature (x) and the gradient of absolute humidity (y) as the experimental factors. The results showed that the drying indexes (drying time, average drying rate, accumulated temperature) reached optimal values under the drying conditions of cooling and dehumidifying; among them, the optimal value of x was 10 °C (50 °C, 40 °C, and 30 °C), and the optimal value of y was 8 g/m3 (25 g/m3, 17 g/m3, and 9 g/m3). The quality indexes (percentage of damage, fatty acid value, germination rate) reached the optimal values under the drying conditions of heating and humidifying; among them, the optimal value of y for the three quality indicators was 8 g/m3 (9 g/m3, 17 g/m3, and 25 g/m3), but the optimal value of x were different, the optimal value of x were 2.65 °C (39.35 °C, 42 °C, and 44.65 °C), 2.24 °C (39.76 °C, 42 °C, and 44.24 °C) and 6.33 °C (35.67 °C, 42 °C, and 48.33 °C). A genetic algorithm was used to transform the multi-objective function into one index, and the results show that: when x was 2.26°C (39.74°C, 42.00°C, and 44.26°C), y was 4.84 g/m3 (12.16 g/m3, 17.00 g/m3, and 21.84 g/m3), the comprehensive characteristics of the drying process can be optimized.
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- 2020
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194. Aroma and quality of carrot dried using a microwave-convective drying system as affect by temperature gradient
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Jiangmiao Wu, Wang Tao, Zhen Xiao, Dongyun Wang, Yuan Jianfeng, Wanxiu Xu, Gang Li, Jinghong Tian, Ziming Xia, Guanyu Zhu, Shiju E, and Sun Xiaoming
- Subjects
Convection ,Materials science ,biology ,lcsh:TP368-456 ,010401 analytical chemistry ,drying temperature gradient ,Monitoring system ,lcsh:TX341-641 ,04 agricultural and veterinary sciences ,biology.organism_classification ,040401 food science ,01 natural sciences ,0104 chemical sciences ,Temperature gradient ,lcsh:Food processing and manufacture ,0404 agricultural biotechnology ,aroma ,quality ,Air drying ,Food science ,lcsh:Nutrition. Foods and food supply ,Microwave ,Aroma ,Food Science ,carrot - Abstract
A real-time aroma monitoring system to control a microwave combined with hot air drying (MHAD) process of carrot was designed. The samples were first dried at four fixed temperature gradients of 2°C/mm, 4°C/mm, 6°C/mm and 8°C/mm to investigate the effect of temperature gradient on the aroma diffusion. Carrot samples could be dried in a shorter time from 140 min to 100 min from low-temperature gradients 2°C/mm to high-temperature gradient 8°C/mm. Main volatiles lost more and charring volatiles was induced at highest temperature gradients 8°C/mm. A fuzzy logic controller was then designed and employed to control the drying process. Based on the temperature curve achieved under fuzzy logic control, a simple linear control method was developed where e-nose online assistance could be omitted. Color, vitamin C, rehydration ratio and sensory evaluation were performed after rehydration. With the new control strategies, carrot color and overall appearance were intact and less time and energy were consumed.
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- 2020
195. Modelling the drying characteristics of the traditional Indonesian crackers 'kerupuk'
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Annisa Kusumaningrum, D. J. Prasetyo, Asep Nurhikmat, and Ervika Rahayu Novita Herawati
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business.industry ,Flavour ,Food processing ,Animal Science and Zoology ,Air drying ,Process engineering ,business ,Agronomy and Crop Science ,Water content ,Texture (geology) ,Mathematics ,Vacuum drying - Published
- 2019
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196. Change of antioxidant compounds of spices during drying
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Emőke Anita Papp-Topa, Andrea Kántor, Nikolett Czipa, Loránd Alexa, and Béla Kovács
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Antioxidant ,Chemistry ,medicine.medical_treatment ,medicine ,General Earth and Planetary Sciences ,Dry matter ,Air drying ,Food science ,Water content ,General Environmental Science - Abstract
Spices and herbs have been used by humanity for thousands of years, so they are very important plants. In this study, the change of dry matter content and antioxidant compounds of eight spices (basil, thyme, rosemary, mint, parsley, lemongrass, chives, coriander) have been examined the raw plants and in plants preserved by three different drying methods (an oven in 50–60°C; drying at room temperature; lyophilisation between -40 and -50°C, under pressure), because we wanted to see the change of the parameters. The water content of raw plants was very high, i.e. the dry matter content was very low. By the application of the three drying methods nearly 100% of the water has left the plants, with the exception of the lyophilized basil and rosemary. Based on the results related to the original material, lyophilized has proved to be the best treatment for the preservation of antioxidant compounds, however air drying also showed high results for some spices.
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- 2019
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197. Influence of drying methods on the drying kinetics, bioactive compounds and flavor of solid-state fermented okara
- Author
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Hui Shi, Min Zhang, Arun S. Mujumdar, Weiqin Wang, and Jichen Xu
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Materials science ,General Chemical Engineering ,Kinetics ,Solid-state ,04 agricultural and veterinary sciences ,02 engineering and technology ,040401 food science ,Vacuum drying ,Freeze-drying ,0404 agricultural biotechnology ,020401 chemical engineering ,Chemical engineering ,Air drying ,Fermentation ,0204 chemical engineering ,Physical and Theoretical Chemistry ,Flavor ,Microwave - Abstract
Solid-state fermented Omar’s was dried using microwave vacuum drying (MVD) and infrared freeze-drying (IFD). Hot air drying (AD) and traditional vacuum freeze-drying (FD) were used as controls. The...
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- 2019
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198. Kinetics of air drying of jackfruit and mango pulp and development of mixed leather
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Md Amin, Md Islam, Farzana Akter, and Tasmia Rosy
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mango pulp ,Blanching ,Chemistry ,Pulp (paper) ,Kinetics ,lcsh:S ,dehydration ,jackfruit pulp ,engineering.material ,medicine.disease ,Ascorbic acid ,Pulp and paper industry ,lcsh:Agriculture ,stomatognathic system ,mixed leather and activation energy ,engineering ,medicine ,Air drying ,Dehydration ,Chemical composition ,Water content - Abstract
The study was concerned with the kinetics of dehydration of jackfruit and mango pulp and their use for the development of mixed leather. Kinetics study showed that jackfruit pulp dried faster than mango pulp. The chemical composition of fresh jackfruit and mango pulp showed that moisture, ash, protein, fat, vitamin -C, acidity, pH and total soluble solids content were found 74.23%, 0.86%, 1.55%, 0.60%, 5.04 mg/100g, 0.224% (wb), 5.41 and 25.0% for jackfruit pulp, whereas for mango pulp, the contents are 80.1%, 0.45%, 1.2%, 0.70%, 24.2 mg/100 g, 0.48% (wb), 3.79 and 18.0% respectively. During mechanical drying, it was shown that drying rate decreased with the increase in thickness and for fresh jackfruit and mango pulp, values of index n were 0.38 and 0.20 at 60°C respectively, whereas for steam blanched jackfruit and mango pulp, value of index n were 0.38 and 0.29 at 60°C respectively and these were lower than 2 as predicted by the Ficks 2nd law of diffusion. The activation energy (Ea) was calculated as 3.12 Kcal/g.mole, 2.786 Kcal/g.mole, 2.90 Kcal/g.mole and 2.786 Kcal/g.mole for the fresh jackfruit, fresh mango, steam blanched jackfruit and steam blanched mango pulps respectively. The organoleptic taste test showed that sample 401 (Fruit pulp with sugar and KMS) secured highest score. [Fundam Appl Agric 2019; 4(4.000): 1089-1096]
- Published
- 2019
199. Production of High-Quality, Semi-dried Dorumuk (Arctoscopus japonicus) through Infrared-Assisted Air Drying
- Author
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Sung Hee Park and SangGuan You
- Subjects
Arctoscopus japonicus ,Materials science ,biology ,Infrared ,Air drying ,Texture (crystalline) ,biology.organism_classification ,Pulp and paper industry ,Food Science - Published
- 2019
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200. Investigations of some quality parameters and mathematical modeling of dried functional chips
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Senem Suna, Tuğçe Halil, Canan Ece Tamer, and Azime Özkan Karabacak
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Fluid Flow and Transfer Processes ,Chemistry ,020209 energy ,Green Olive ,02 engineering and technology ,Condensed Matter Physics ,Snack food ,Vacuum drying ,Protein content ,020401 chemical engineering ,Age groups ,0202 electrical engineering, electronic engineering, information engineering ,Air drying ,Food science ,0204 chemical engineering - Abstract
In this study, the production of green olive, chickpea and haricot bean added potato chips was investigated in order to produce a functional snack food appealing to consumers from all age groups. Chips were produced by hot air drying (75–85 °C), vacuum drying (75–85 °C, 250 mbar), and microwave drying (90 W and 180 W). The effective diffusion coefficient of chips was calculated as between 4.25 × 10−9- 4.38 × 10−8. When the drying behavior of samples was examined; vacuum drying, convectional drying and microwave drying fitted in Page and Modified Page models. Total acidity, pH, salt, protein, total phenolics and antioxidant activity analyses were conducted in chips and chips doughs. In olive added chips, the highest total phenolic content was determined in the sample produced by vacuum drying method at 85 °C. Moreover, for chickpea-olive added chips, the highest total phenolic content and antioxidant activity were determined in microwave dried (180 W) samples. In haricot bean and olive added chips, antioxidant activity showed differences according to drying methods. Chickpea and haricot bean addition into chips doughs were increased the protein content in dried samples.
- Published
- 2019
- Full Text
- View/download PDF
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