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13 results on '"Rastija, Vesna"'

1. QSAR of antitrypanosomal activities of polyphenols and their analogues using multiple linear regression and artificial neural networks.

Author

Rastija V and Masand VH

Subjects
Inhibitory Concentration 50, Linear Models, Molecular Structure, Multivariate Analysis, Neural Networks, Computer, Models, Theoretical, Polyphenols chemistry, Quantitative Structure-Activity Relationship, Trypanocidal Agents chemistry
Abstract

In order to find a thriving quantitative structure-activity relationship for antitrypanosomal activities (against Trypanosma brucei rhodesiense) of polyphenols that belong to different structural groups, multiple linear regression (MLR) and artificial neural networks (ANN) were employed. The analysis was performed on two different-sized training sets (59% and 78% molecules in the training set), resulting in relatively successful MLR and ANN models for the data set containing the smaller training set. The best MLR model obtained using the five descriptors (R3m(+), GAP, DISPv, HATS2m, JGI2) was able to account only for 74% of the variance of antitrypanosomal activities of the training set and achieved a high internal, but low external prediction. Nonlinearities of the best ANN model compared with the linear model improved the coefficient of determination to 98.6%, and showed a better external predictive ability. The obtained models displayed relevance of the distance between oxygen atoms in molecules of polyphenols, as well as stability of molecules, measured by the difference between the energy of the highest occupied molecular orbital and the energy of the lowest unoccupied molecular orbital (GAP) for their activity.

Published
2014
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2. Quantitative relationships between structure and lipophilicity of naturally occurring polyphenols.

Author

Rastija V, Nikolić S, and Masand VH

Subjects
Drug Design, Hydrophobic and Hydrophilic Interactions, Models, Theoretical, Polyphenols chemistry, Quantitative Structure-Activity Relationship
Abstract

The lipophilicity of polyphenols inherent in food, beverages, and medicinal plants was modelled by using 3D descriptors derived from optimized 3D molecular structures in combination with 2D descriptors. The training sets were generated by manual selection or by cluster formation, and statistically robust predictive models were obtained in both cases. The most relevant structural features for the lipophilicity of polyphenols are depicted by the statistically most significant variables: the number of donor atoms for the H bonds is unfavorable for lipophilicity, and the enhanced number of ring secondary C atom (sp3) also decreases lipophilicity, while the increased atomic polarizability implies higher lipophilicity of polyphenols. The study also revealed the importance of a three-dimensional distribution of atomic electronegativity for the lipophilicity of molecules.

Published
2013

3. Impact of leaf removal as a source of stresses on grapevine yields, chemical characteristics, and anthocyanin content in the grapevine variety Babica.

Author

Drenjančević, Mato, Kujundžić, Toni, Jukić, Vladimir, Karnaš, Maja, Braun, Ulrike, Schwander, Florian, Teklić, Tihana, and Rastija, Vesna

Subjects
VITIS vinifera, GRAPES, ANTHOCYANINS, YIELD stress, GRAPE ripening, MEDITERRANEAN climate, GRAPE quality
Abstract

Leaf removal (LR) treatments improve the photosynthetic capacity of the remaining leaves and induce flavonoid synthesis as a stress response in the common grapevine (Vitis vinifera L.). However, excessive exposure of grape berries to UV‐B radiation as a result of cultural practices in the Mediterranean climate may have negative effects on berry composition. This 2‐year study determined the effects of defoliation on the autochthonous red grape variety 'Babica' in a Mediterranean climate (wine‐growing region Dalmatia, Croatia). Six leaves were removed before flowering (FLR) and at the end of véraison (the onset of grape ripening; VerLR) and were compared to the untreated control. Yield parameters, sugar content, grape must pH, total polyphenols (TP), total anthocyanin (TA) content, and individual anthocyanin compounds were measured in grape skin extracts and wines. However, the greater mean daily temperature during the vegetation period and lesser rainfall before harvest in 2018 increased yield per vine, average cluster weights, density, and total acidity, compared to 2017. Both defoliation treatments significantly reduced TP in grape extracts, but these differences were not observed in wine. Compared to the control (NLR), VerLR treatment significantly reduced TA in grape skin extracts and wine. Significantly lesser TP concentrations, in grape skin extracts and wine, as well as TA were noticed during the 2017 season. VerLR treatment reduced the concentration of nine individual anthocyanins compared to the control in grape skin extracts, while this effect was not observed in wine. Season year was a statistically significant source of variability of the individual anthocyanin contents in wine. Under specific environmental conditions LR can decrease polyphenols, especially anthocyanins, and negatively impact grape and wine quality. [ABSTRACT FROM AUTHOR]

Published
2023
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4. Antioxidant Activity, Metabolism, and Bioavailability of Polyphenols in the Diet of Animals.

Author

Bešlo, Drago, Golubić, Nataša, Rastija, Vesna, Agić, Dejan, Karnaš, Maja, Šubarić, Domagoj, and Lučić, Bono

Subjects
ANIMAL feeding behavior, FOOD of animal origin, ANIMAL nutrition, POLYPHENOLS, SATURATED fatty acids, PLANT polyphenols
Abstract

As the world's population grows, so does the need for more and more animal feed. In 2006, the EU banned the use of antibiotics and other chemicals in order to reduce chemical residues in food consumed by humans. It is well known that oxidative stress and inflammatory processes must be combated to achieve higher productivity. The adverse effects of the use of pharmaceuticals and other synthetic compounds on animal health and product quality and safety have increased interest in phytocompounds. With the use of plant polyphenols in animal nutrition, they are gaining more attention as a supplement to animal feed. Livestock feeding based on a sustainable, environmentally friendly approach (clean, safe, and green agriculture) would also be a win–win for farmers and society. There is an increasing interest in producing healthier products of animal origin with a higher ratio of polyunsaturated fatty acids (PUFAs) to saturated fatty acids by modulating animal nutrition. Secondary plant metabolites (polyphenols) are essential chemical compounds for plant physiology as they are involved in various functions such as growth, pigmentation, and resistance to pathogenic organisms. Polyphenols are exogenous antioxidants that act as one of the first lines of cell defense. Therefore, the discoveries on the intracellular antioxidant activity of polyphenols as a plant supplement have contributed significantly to the improvement of antioxidant activity, as polyphenols prevent oxidative stress damage and eliminate excessively produced free radicals. To achieve animal welfare, reduce stress and the need for medicines, and increase the quality of food of animal origin, the addition of polyphenols to research and breeding can be practised in part with a free-choice approach to animal nutrition. [ABSTRACT FROM AUTHOR]

Published
2023
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6. Polyphenols in Ruminant Nutrition and Their Effects on Reproduction.

Author

Bešlo, Drago, Došlić, Gloria, Agić, Dejan, Rastija, Vesna, Šperanda, Marcela, Gantner, Vesna, and Lučić, Bono

Subjects
RUMINANT nutrition, POLYPHENOLS, BIOAVAILABILITY, ANIMAL reproduction, OVUM, SPERMATOZOA
Abstract

The feeding of domestic animals with diets in which polyphenols are present is increasingly attracting the attention of nutritionists and scientists. This review summarizes the knowledge regarding polyphenols' possible positive and negative effects and their bioavailability. The bioavailability of substances is a prerequisite for any postabsorption effect in vivo. Positive and negative properties have been confirmed in previous studies on the diets of domestic animals rich in polyphenols, such as secondary metabolites of plants. Free radicals are formed in every organism, leading to oxidative stress. Free radicals are highly reactive molecules and can react in cells with macromolecules and can cause damage, including in reproductive cells. Some polyphenols at specific concentrations have antioxidant properties that positively affect animal reproduction by improving the quality of male and female gametes. The intake of phytoestrogens that mimic estrogen function can induce various pathological conditions in the female reproductive tract, including ovarian, fallopian, and uterine dysfunction. The metabolism of genistein and daidzein yields the metabolites equol and p-phenyl-phenol, leading to a decline in cow fertilization. The findings so far confirm that numerous questions still need to be answered. This review points out the importance of using polyphenols that have both benificial and some unfavorable properties in specific diets. [ABSTRACT FROM AUTHOR]

Published
2022
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7. Analysis of biologically active polyphenols in wines from Croatia

Author

Rastija, Vesna and Medić-Šarić, Marica

Subjects
polyphenols, wine, food and beverages, HPLC
Abstract

ANALYSIS OF BIOLOGICALLY ACTIVE POLYPHENOLS IN WINES FROM CROATIA V. Rastija and M. Medić- Šarić Introduction Polyphenols are secondary plant metabolites that attract great interest due to their biological activities, such as antioxidant activity, anti-inflammatory, antimicrobial and antifungal action. There is evidence that some of them have positive effect against a large variety of degenerative processes, such as cancer, atherosclerosis, cardiovascular disorders, age-related macular degeneration and cognitive decline in aging. Wines contain large amount of polyphenols such as phenolic acids, flavones, flavonols, catechins, anthocyanins, procyanidins and resveratrol. Considering the importance of biologically active polyphenols in wine, it is necessary to develop an accurate and rapid method for their analysis. Materials and Method Twelve commercial wines, vintage 2002, from three different wine-growing Sub-regions of Croatia were analyzed. Total polyphenols were analyzed according to the Folin– Ciocalteu method. Samples for chromatographic analysis were prepared by extraction of wines with diethyl ether at pH 2. A reversed-phase high performance liquid chromatographic (HPLC) method that uses gradient elution and diode array detection (DAD) to determine 7 phenolic acid and eight flavonoids in wine extracts was developed. The chromatographic separation of these polyphenols was performed in a single run with flow rate at 1 ml/min and UV-visible spectra were recorded between 250 -500 nm and compared with those of standards. Wavelengths used for quantification were 280 nm and 360 nm. Results Analysis of total polyphenols by Folin– Ciocalteu method implied that wines produced in Mediterranean part of Croatia have a highest polyphenolic content. White wines contain significantly lower amounts of total polyphenols (400.8 mg/L) compared with red wines (1665.131 mg/L). Applied HPLC method allows the separation of 19 polyphenols with antioxidant properties from wine extracts in a single run. The most abundant polyphenol is gallic acid (0.7 – 26.9 mg/L). Biologically most active compounds, catechin and trans- resveratrol were present in each of analyzed wine. Highest concentrations of those compounds, together with one of the most potent antioxidant - quercetin, were determined in wines from Dalmatia. Since the vintage of the examined wines was identical, the observed quantitative differences are related to the grape variety, geographical origin, growing and winemaking procedures. Conclusion The present study, which utilized new HPLC method for simultaneous determination of fifteen polyphenols and analysis of total polyphenols, demonstrates that the wines made from Croatia contain a significant amount of biologically active polyphenols and certainly, moderate and regular consumption of those wines (in particular red wine) can reduce risk of some diseases. However, wines made in Dalmatia contain a highest level of polyphenols as a result of dry mediterranean clime with high cluster sun exposure, so those wines could have highest positive effects on human health.

Published
2007

8. Polyphenolic composition of Croatian wines with different geographical origins

Author

Rastija, Vesna, Srečnik, Goran, and Marica-Medić-Šarić

Subjects
*WINE chemistry, *POLYPHENOLS, *WINE analysis, *HIGH performance liquid chromatography
Abstract

Abstract: Twelve samples of commercially available wines produced in three different wine-growing sub-regions of Croatia were analysed, to determine their polyphenolic content and associate the concentration levels of these compounds with the geographical origin of wine. Total phenols were analysed according to the Folin–Ciocalteu method. Fifteen individual polyphenols were analysed by a reverse-phase HPLC method that used gradient elution and diode array detection. Wines made in Central and Southern Dalmatia were richest in total phenols and individual polyphenols. Flavonols and trans-resveratrol pattern were the basis for the classification of samples according to their geographical origin and type of wine. [Copyright &y& Elsevier]

Published
2009
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9. QSAR study of antioxidant activity of wine polyphenols

Author

Rastija, Vesna and Medić-Šarić, Marica

Subjects
*QSAR models, *ANTIOXIDANTS, *POLYPHENOLS, *POLYNOMIALS, *MULTIPLE regression analysis, *DRUG lipophilicity, *CATECHIN
Abstract

Abstract: Quantitative structure activity relationships (QSAR) were obtained describing the antioxidant activity of the main pharmacologically active polyphenols of wine, using molecular properties and descriptors derived from the 2D and 3D representations of molecules. The best models for the prediction of the ability to scavenge the ABTS radical cation were obtained by polynomial regression analysis using zero-order connectivity index and molar refractivity. Statistically, significant models for lipid peroxidation inhibiting effects of flavonoids were obtained by polynomial and multiple regression using lipophilicity, Balaban index, Balaban-type index and 3D GETAWAY descriptor. The 3D descriptors possess the ability for discrimination of stereoisomers, like catechin and epicatechin. We demonstrated that a size and shape of molecules, as well as steric properties, play an important role in the antioxidant activity of polyphenols. [Copyright &y& Elsevier]

Published
2009
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10. Effect of harvest time on some quantitative and qualitative parameters of cv.cabarnet sauvignon (Vitis vinifera L.)

Author

Mucak, Ivona, Drenjančević, Mato, Jukić, Vladimir, and Rastija, Vesna

Subjects
total soluble dry matter, must acidity, ripening of grapes, real acidity, anthocyanins, harvest time, polyphenols
Abstract

Istraživanje je provedeno 2021. godine na pokušalištu Mandićevac, vinogorje Đakovo. Cilj istraživanja bio je utvrditi utjecaj različitih rokova berbe na neke kvantitativne (urod, masa 100 bobica) i kvalitativne (sadržaj ukupne topive suhe tvari, realni aciditet mošta, kiselost mošta, te ukupni polifenoli i antocijani) odlike kultivara cabernet sauvignon. Berba je obavljena u tri roka: 23.09.2021., 29.09.2021. i 05.10.2021. i to na načina da je metodom slučajnog odabira uzorkovan prosječni uzorak grožđa u svakom navedenom roku berbe. Prosječna masa grozda bila je najveća u prvom roku berbe, kao i masa 100 bobica. Sadržaj ukupne topive suhe tvari mošta povećavao se odlaganjem berbe, dok se vrijednost realnog aciditeta mošta kretala u prihvatljivim granicama i sukladno smanjenju kiselosti mošta, odnosno padu sadržaja jabučne i vinske kiseline mošta. Najveći sadržaj ukupnih polifenola i antocijana zabilježen je u prvom roku berbe., Research was conducted in 2021., in vineyard near Đakovo. The aim of the research was to determine the influence of different harvest dates on some quantitative (yield, weigth of 100 berries) and qualitative (total soluble dry matter of must, real acidity of must, must acidity, total polyphenols and total anthocyanins) characteristic of cabernet sauvignon cultivar. The harvest was carried out in three terms: 23.09.2021., 29.09.2021. and 05.10.2021. in such a way that an averange sample of grapes was harvest in each of mentioned terms using the method of random selection. The average weight of spring of grapes was the highest in the first period of harvest, as well as the weight of 100 berries The content of total soluble dry matter of the must grew with delay of the harvest, and the value of the real acidity of the must was within acceptable limits and in accordance with decrease in malic and tartaric acid content. The highest value of the total polyphenols and total anthocyanins was recorded in the first period of harvest.

Published
2022

11. Effect of harvest time on phenolic and anthocyanins content of cv. Blaufrankisch (Vitis vinifera L.)

Author

Pintur, Ivana, Drenjančević, Mato, Jukić, Vladimir, and Rastija, Vesna

Subjects
frankovka, vintage date, polyphenolic ripeness, anthocyanins, polyphenols
Abstract

Cilj istraživanja bio je utvrditi utjecaj različitih rokova berbe na neke kvalitativne (ukupna topiva suha tvar, realni aciditet mošta, ukupna kiselost, ukupni poloifenoli, ukupni antocijani) odlike kultivara Frankovka u vinogorju Đakovo u 2021. godini. Berba je obavljena u tri roka (10.09.2021., 22.09.2021., 04.10.2021.) na način da je metodom slučajnog odabira ubran prosječni uzorak grožđa u svakom od navedenih rokova. Rezultati analiza obrađeni su opisnom statistikom. Sadržaj ukupne topive suhe tvari mošta rastao je sa odmakom berbe, a vrijednost realnog aciditeta mošta kretala se u prihvatljivim granicama. Najviša vrijednost ukupne kiselosti mošta, sadržaja ukupnih polifenola i antocijana zabilježena je u prvom roku berbe., The aim of the research was to determine the influence of different harvest dates on some qualitative (total soluble dry matter, real acidity of must, total acidity, total polyphenols, total anthocyanins) characteristics of the Blaufränkisch cultivar in the Đakovo vineyards in 2021. The harvest was carried out in three terms (10/09/2021, 22/09/2021, 04/10/2021) in such a way that an average sample of grapes was harvested in each of the mentioned terms using the method of random selection. Basic of the results of the analyzes were processed by descriptive statistics. descriptive statistics were made on the collected samples. The content of total soluble dry matter of the must grew with the delay of the harvest, and the value of the real acidity of the must was within acceptable limits. The highest value of the total acidity of the must, the content of total polyphenols, and anthocyanins was recorded in the first period of harvest.

Published
2022

12. DFT calculations and POM analyses of cytotoxicity of some flavonoids from aerial parts of Cupressus sempervirens: Docking and identification of pharmacophore sites.

Author

Elsharkawy, Eman R., Almalki, Faisal, Ben Hadda, Taibi, Rastija, Vesna, Lafridi, Hind, and Zgou, Hsaine

Subjects
*CYPRESS, *HEPATOCELLULAR carcinoma, *FLAVONOIDS, *CHEMICAL composition of plants, *ELECTRON impact ionization, *DENSITY functional theory, *MASS spectrometry
Abstract

• Two novel compounds apigenin 4′-pernyl-8-glucopyranosyl -7-O-α-glucopyranoside) and apigenin 4′-pernyl-8-glucopyranosyl -7-O-α-glucopyranoside), were isolated from the leaves of Cupressus sempervirens. • DFT, POM and docking analyses methods were applied in the structural validation of new isolated compounds. • The isolated compounds showed significant cytotoxicity against human hepatocellular liver carcinoma HepG2 cells, MCF-7, HC116 and A549. Two known polyphenols named apigenin 7-O-β- d -glucopyranoside (S1) and querctine-3-O-glucoside (S2), along with another two new compounds apigenin 4′-geranyl-8-glucopyranosyl-7-O-α-glucopyranoside (S3) and apigenin 4′-pernyl-8-glucopyranosyl -7-O-α-glucopyranoside (S4), were isolated from the leaves of Cupressus sempervirens. Structure elucidation of the isolated polyphenols was established on the basis of detailed spectroscopic analysis like 1D and 2D NMR analyses including 1H NMR, 13C NMR, COSY, DEPT, HMQC, UV, and Electron Spray Ionization Mass Spectroscopy (ESI-MS). Density Functional Theory (DFT) of computational, Petra/Osiris/Molinspiration (POM), and docking analyses methods were applied in the structural validation of new isolated compounds. The isolated compounds S1-S4 showed significant cytotoxicity against human hepatocellular liver carcinoma HepG2 cells, MCF-7, HC116 and A549. [ABSTRACT FROM AUTHOR]

Published
2020
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13. Effects of different terms of defoliation on some qualitative parameters of cultivar Frankovka (Vitis vinifera L.) in the Đakovo vineyards in 2015. year

Author

Rončević, Branimir, Drenjančević, Mato, Jukić, Vladimir, and Rastija, Vesna

Subjects
defoliation, vine, Blaufränkisch, anthocyanins, polyphenols
Abstract

Defolijacija je standardna vinogradarska mjera uklanjanja lišća u zoni grozda sa ciljem postizanja boljeg dozrijevanja groţĊa, prozraĉnosti, osiguravanje bolje zaštite od bolesti poput sive plijesni, boljeg razvoja mladica te ostalih vegetativnih dijelova, a moţe se provodit u razliĉitim terminima. Brojna istraţivanja svjedoĉe kako je defolijacija visoko korisna mjera. Cilj istraţivanja bio je utvrditi utjecaj razliĉitih termina defolijacije na sadrţaj šećera, ukupnu kiselost i realnu kiselost mošta te sadrţaj ukupnih polifenola i antocijanina u pokoţici kultivara Frankovka (Vitis vinifera L.). Istraţivanje je provedeno tijekom 2015. godine na vinogradarsko-vinarskom pokušalištu Poljoprivrednog fakulteta Osijek smještenom u Mandićevcu, vinogradarska regija Istoĉna kontinentalna Hrvatska, podregija Slavonija, vinogorje Đakovo. Pokus je postavljen po sluĉajnom blok sustavu s tri varijante u ĉetiri ponavljanja (kontrolni tretman – bez defolijacije, defolijacija neposredno po završetku cvatnje - E-L faza 27 i defolijacija pred poĉetak faze šare – E-L faza 34). Za parametre sadrţaj šećera u moštu, ukupna kislelost i realni aciditet mošta nisu utvĊene statistiĉki znaĉajne razlike. Kod sadrţaja sadrţaja ukupnih polifenola nisu utvrĊene statistiĉki znaĉajne razlike izmeĊu kontrolnog (417 mg/kg) i tretmana s defolijacijom po završetku cvatnje (426 mg/kg), a znaĉajno viši sadrţaj ukupnih polifenola, u odnosu na prethodna dva tretmana, izmjeren je kod tretmana s defolijacijom pred poĉetak šare (470 mg/kg). Ukupni sadrţaj antocijana statistiĉki se znaĉajno razlikuje. Rana defolijacija po završetku cvatnje dovela je do smanjenja sadrţaja ukupnih antocijana (461 mg/kg), a defolijacija pred poĉetak šare dovodi do suprotnog uĉinka odnosno znaĉajnog povećanja ukupnih antocijana (569 mg/kg), a kod kontrolnog tretmana je iznosio 530 mg/kg., Defoliation is a standard measure of removing the vine leaves in the zone cluster with the aim of achieving a better ripening of grapes, breathability, providing better protection from diseases such as gray mold, better development of shoots and other vegetative parts, and can be implemented in different terms. Numerous studies indicate that defoliation is a highly useful measure. The aim of this study was to determine the effect of different terms of defoliation on sugar content, total acidity and real acidity of must and content of total polyphenols and anthocyanins in the epidermis of Blaufränkisch cultivars (Vitis vinifera L.). The study was conducted during 2015. on experimental wineyard of Agricultural Faculty Osijek, located in Mandićevac, viticultural region Eastern Continental Croatia, Slavonia subregion, vineyards Đakovo. The experiment was design as a randomized complete block system with three variants in four replications (control treatment – no defoliation, defoliation immediately after pre-bloom – E-L phase 27 and defoliation before the start of veraison – E-L phase 34). There was no significant differences for parameters of the sugar content in the must, total acidity and real acidity of must. Also content of total polyphenols shows no statistically significant differences between the control (417 mg/kg) and treatment with defoliation after the end of flowering (426 mg/kg), but significanty higher content of total polyphenols, compared to the two previous treatment ,was measured at treatment with defoliation before the start of veraison (470 mg/kg). The total content of anthocyanins was significantly different. Early defoliation after completion of flowering shows reduce of content of anthocyanins (461 mg/kg), and defoliation before the veraison leads to the opposite effect and a significant increase of total anthocyanins (569 mg/kg), while in the control treatment was 530 mg/kg.

Published
2016

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