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1. Eco-friendly PVA-chitosan adsorbent films for the removal of azo dye Acid Orange 7: Physical cross-linking, adsorption process, and reuse of the material

Author

John Perez-Calderon, Diego Alejandro Marin-Silva, Noemi Zaritzky, and Adriana Pinotti

Subjects
Hybrid film, Biosorbent, Azo dye, Chitosan, PVA, Physical cross-linking, Polymers and polymer manufacture, TP1080-1185, Engineering (General). Civil engineering (General), TA1-2040
Abstract

The treatment of wastewater requires the use of eco-friendly and cost-efficient adsorbents. A hybrid adsorbent film based on biodegradable polymers (poly(vinyl alcohol) (PVA) and chitosan (Ch) was developed to remove Acid Orange 7 (AO7), an azo dye from the textile industry present in industrial wastewaters. The polymeric absorbent material was submitted to a curing process with different time-temperature combinations which improved its physical stability in aqueous media. This result was supported by modulated differential scanning calorimetry (MDSC) and thermogravimetric analysis (TGA). ATR-FTIR also confirmed the electrostatic interactions by hydrogen bonds between PVA and Ch, as well as among the polymers and the dye. The best curing condition to reach a high removal without weight loss was the combination of 160°C-1h.Dye adsorption depended mainly on pH, adsorbent dose, contact time, temperature, and coexisting anions. The maximum removal efficiency (>91%) was achieved at pH = 2.5. The adsorption kinetics followed the Lagergren pseudo first-order rate equation and the adsorption isotherm was best described by the Redlich-Peterson model. As far as the authors know, the maximum adsorption capacity (Qm) of the adsorbent film obtained in the present work is the highest value reported in literature (Qm = 678 mg/g at 298 K and pH = 2.5). Physisorption would be the dominant mechanism at pH 4.0 while at pH 2.5 the process was conducted by chemisorption. Regeneration studies showed that composites could be used for five consecutive cycles without losing their adsorption capacity.Thus, the use of the developed eco-compatible biodegradable materials would allow easy regeneration without losing removal selectivity, a key feature in the development of environmentally friendly sorbent materials.

Published
2023
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2. Green apple baked snacks functionalized with edible coatings of methylcellulose containing Lactobacillus plantarum

Author

María José Tavera-Quiroz, Nelson Romano, Pablo Mobili, Adriana Pinotti, Andrea Gómez-Zavaglia, and Nora Bertola

Subjects
Lactobacillus plantarum, Probiotics, Apple snacks, Methylcellulose, Isomalt, Fructooligosaccharides, Nutrition. Foods and food supply, TX341-641
Abstract

The aim of the present work was to develop a healthy snack as a vehicle of probiotic bacteria. Apple snacks were coated with methylcellulose films containing fructooligosaccharides and Lactobacillus plantarum CIDCA 83114. Dehydration of the snacks at 60 °C for 50 min allowed obtaining a product with water content, crispness and visual aspect similar to those before applying the film-forming solution, without major detrimental effects for microorganisms. Sensory attributes of coated snacks were evaluated by an experienced sensory panel, receiving good scores in taste (6.5 ± 0.6), color (7.7 ± 0.4), texture (7.2 ± 0.4) and overall acceptability (7.2 ± 0.3). Storage of the snacks at 20 °C and 60% RH caused only a mild decrease in the bacterial cultivability after 90 days (1.4 log CFU/g), and a significant number of bacteria were still alive after the simulated gastric (5.5 × 106 ± 0.7 × 106 CFU/g) and intestinal (1.0 × 106 ± 0.4 × 106 CFU/g) digestions of the stored samples. The force–deformation curves showed a typical pattern of brittle materials up to 90 days of storage. The Tg followed a similar trend, in accordance with the constant moisture content. An organoleptically attractive food product was obtained which after 90 days of storage presented a high load of cultivable lactobacilli (2.0 × 108 ± 0.7 × 108 CFU/g). This concentration is well above the minimum considered necessary (106–107 CFU/g) to obtain the benefits of probiotic consumption.

Published
2015
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4. Contributors

Author

Abdellah Aaddane, Mohammed Abdullah Issa, Noor Amirah Abdul Halim, Tapan Kumar Adhya, Michael Arkas, Shirsendu Banerjee, Cristiano P. Borges, Abdelmjid Bouazizi, Cristian H. Campos, Jorge Vinicius Fernandes Lima Cavalcanti, Sankha Chakrabortty, Amit Chattree, Juan Carlos Colmenares, Bruno Melo da Luz, Maurício Alves da Motta Sobrinho, Gabriela Silveira da Rosa, Shabnam Dan, André Ricardo Felkl de Almeida, Madson de Godoi Pereira, Alfredo De Jesús-González, Paola-Sarahí De Velasco-Maldonado, Eleni A. Deliyanni, Arnaud Victor dos Santos, Marilina Douloudi, Mathias Ernst, Fabiana V. Fonseca, K.Y. Foo, Tiago José Marques Fraga, Regina Geris, Marcos Gomes Ghislandi, Dimitrios A. Giannakoudakis, Balendu Shekher Giri, Nur Haninah Harun, Oshadi Hettithanthri, Vimal Katiyar, Theodora Katsika, Ioannis Katsoyiannis, Dejan Kepić, Vaneet Kumar, Shaniv Kumar Tiwari, N. Lakshmana Reddy, Aline M.F. Linhares, Iván F. Macías-Quiroga, Marcos Malta, Saikumar Manchala, Natalia Manousi, Manuela Manrique-Holguín, Lucas Meili, Ana Rosa Costa Muniz, S.M. Shiva Nagendra, Vaishakh Nair, Nadeeshani Nanayakkara, Jayato Nayak, Eleni Nikoli, Paula Osorio-Vargas, Mohamed Ouammou, Dinesh Pathak, Adriana Pinotti, Luis R. Pizzio, Jovana Prekodravac, Anushka Upamali Rajapaksha, N. Ramesh Reddy, Norma-Aurea Rangel-Vázquez, Íris Nunes Raupp, Julián A. Rengifo-Herrera, Tereza Longaray Rodrigues, null Saruchi, M.V. Shankar, Larissa L.S. Silva, Marie-Odile Simonnot, Mrutyunjay Suar, K.L. Tan, Sonam Tantuvoy, Luana Vaz Tholozan, Najib Tijani, Nitika Tiwari, Athanasia Tolkou, Suraj Kumar Tripathy, Muhammad Usman, Alaor Valério Filho, Bojana Vasiljević, Naveen Kumar Veldurthi, Nirdosh Verma, Meththika Vithanage, Musa Yahaya Pudza, Saad Alami Younssi, George A. Zachariadis, Zurina Zainal Abidin, and Hamid Zentou

Published
2023
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8. Facile photocatalytic immobilization strategy for P-25 TiO2 nanoparticles on low density polyethylene films and their UV-A photo-induced super hydrophilicity and photocatalytic activity

Author

Daniel Pais-Ospina, Julián A. Rengifo-Herrera, Diego A. Marín-Silva, Luis Rene Pizzio, Paula Osorio-Vargas, John J. Alvear-Daza, Laura Cristina Damonte, and Adriana Pinotti

Subjects
Materials science, SELF-CLEANING SURFACES, POLYMER FUNCTIONALIZATION, Nanoparticle, 02 engineering and technology, IMMOBILIZATION OF TIO2SUPER-HYDROPHILICITY, Química Inorgánica y Nuclear, 010402 general chemistry, 01 natural sciences, Catalysis, chemistry.chemical_compound, Irradiation, chemistry.chemical_classification, Ciencias Químicas, General Chemistry, Polymer, Polyethylene, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Low-density polyethylene, chemistry, Chemical engineering, Photocatalysis, Surface modification, 0210 nano-technology, CIENCIAS NATURALES Y EXACTAS
Abstract

Immobilization of TiO2-P-25 nanoparticles on low-density polyethylene films (LDPE) was successfully achieved through a simple and facile photocatalytic procedure leading to the polymer surface functionalization (generating -C = O species) by TiO2 photo-induced •OH radicals. A systematic study through a response surface methodology (RSM) of type central composite experimental design (DCC)-23 in 3 blocks to find optimal conditions of irradiation time, pH and P-25 amounts was performed. It was found that circumneutral pH (5.0), low amounts of P-25 nanoparticles (0.4 g L-1) and irradiation times of 5 h (LDPE-P25-5 films) may be the best immobilization conditions. This was confirmed by SEM-EDS micrographs and AFM images. LDPE-P25-5 films exhibited the best photocatalytic activity removing malachite green and it was also observed an interesting UV-A photo-induced super hydrophilicity since angle contact dropped from 118 to 4° after 60 min of UV-A irradiation. Furthermore, LDPE-P25-5 film kept its photoinduced self-cleaning properties after 4 reusing cycles (8 h of continuous UV-A + visible irradiation). These findings suggest that this simple and facile photocatalytic procedure may allow the preparation of TiO2-polymeric films with interesting properties to be applied as photoinduced self-cleaning surfaces. Fil: Alvear Daza, John Jairo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina Fil: Pais Ospina, Daniel. Universidad Tecnológica de Pereira; Colombia Fil: Marín Silva, Diego Alejandro. Universidad del Bío-Bío. Departamento de Ingeniería en Maderas. Escuela de Ingeniería Química; Chile. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos; Argentina Fil: Pinotti, Adriana Noemi. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos; Argentina. Universidad del Bío-Bío. Departamento de Ingeniería en Maderas. Escuela de Ingeniería Química; Chile Fil: Damonte, Laura Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina. Universidad Austral. Facultad de Ingeniería; Argentina Fil: Pizzio, Luis Rene. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina Fil: Osorio Vargas, Paula. Universidad Tecnológica de Pereira; Colombia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina Fil: Rengifo Herrera, Julian Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina

Published
2021
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10. Plasticized methylcellulose coating for reducing oil uptake in potato chips

Author

María José, Tavera-Quiroz, Marina, Urriza, Adriana, Pinotti, and Nora, Bertola

Subjects
Glycerol, Food Handling, Color, Consumer Behavior, Methylcellulose, Dietary Fats, Absorption, Diet, Plant Tubers, Sugar Alcohols, Plasticizers, Taste, Humans, Plant Oils, Sorbitol, Sunflower Oil, Cooking, Stress, Mechanical, Solanum tuberosum
Abstract

As a result of consumers' health concerns and the trend towards healthier and low-fat food products, research has been undertaken to reduce the amount of fat absorbed in fried foods. This work focused on studying the efficacy of sorbitol and glycerol as plasticizers of methylcellulose coatings used to reduce oil uptake during the frying process of potato chipsChanges in color, mechanical properties, water activity and lipid oxidation during storage were monitored. Also, an explanation regarding the different performances between both methylcellulose coatings with and without plasticizer was attained and techniques from the field of packaging films such as dynamic mechanical analyzer (DMA) and Fourier transform infrared spectroscopy were applied to analyze the behavior of coatings submitted to the frying operation. The application of a methylcellulose coating was an adequate choice to reduce oil absorption in fried potato chips. The most effective formulation was 10 g L(-1) methylcellulose with the addition of 7.5 g L(-1) sorbitol. With the incorporation of this formulation, oil absorption was reduced by 30%. Neither the sorbitol concentration nor the presence of the MC coating affected the puncture maximum force and color parameters L and a*. The results of the sensory analysis indicated that the panelists could not distinguish between the coated and uncoated potato chips.Methylcellulose-based coating plasticized with sorbitol could be an alternative for obtaining healthier potato chips.

Published
2011

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