Biodegradable plastic made from bean products |
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| Institution: | 1. Department of Chemistry, Engineering Faculty, Buenos Aires University, Paseo Colon 850 (C.P. 1063), Buenos Aires, Argentina;2. Technological and Agricultural Unit, Ezeiza Atomic Center, National Atomic Energy Commission, Argentina;1. Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, 96010-900 Pelotas, Brazil;2. Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas, 96010-900 Pelotas, Brazil;1. Biological Sciences Training and Research Unit: Department of Mathematics, Physics and Chemistry. University Peleforo Gon Coulibaly, B.P. 1328, Korhogo, Côte d''Ivoire;2. Basic and Applied Sciences Training and Research Unit: Department of Chemistry, University Nangui Abrogoua 02, B.P. 801 Abidjan 02, Côte d''Ivoire;3. Centre Ivoirien Antipollution (CIAPOL), Central Environmental Laboratory, 04 BP 541 Abidjan 04, Côte d''Ivoire;1. Environmental Science Program, Memorial University of Newfoundland, St. John''s, NL A1B 3X7 Canada;2. Chemistry Department, Memorial University of Newfoundland, St. John''s, Newfoundland A1C 5S7, Canada;3. Department of Ocean Sciences, Memorial University of Newfoundland, St. John''s, Newfoundland A1C 5S7, Canada;4. Fisheries and Oceans Canada, Science Branch, Special Projects, St John''s, NL, A1C 5X, Canada;5. School of Science and the Environment, Memorial University of Newfoundland, Grenfell Campus, Corner Brook, NL A2H 5G4, Canada;6. Environmental Policy Institute, Memorial University of Newfoundland, Grenfell Campus, Corner Brook, NL A2H 5G4, Canada;7. Forestry Economics Research Centre, Vietnamese Academy of Forest Sciences, 46 Duc Thang ward, Northern Tu Liem District, Hanoi 11910, Viet Nam |
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| Abstract: | The aim of the present work was to explore the suitability of two kinds of bean with typical protein quality and different starch structure to produce moulded specimens by compression. In this work we analysed the possibility of forming new plastic materials from two kinds of bean preparations; with different protein content, in the presence or absence of inherent cellulose material and other biopolymer such as starch. Significant differences were determined in the fine structure of glucopolysaccharides isolated from the different types of bean. Complete moulding of the specimens took place at 20 MPa at a temperature not higher than 140°C, for 7 min. The mechanical properties of the moulded plastics based on soluble protein black bean (BP) were superior in elongation, tensile strength and low water absorption than the soluble protein white bean (WP) variety. However, the addition of boric acid 3% (w/w, in total batch basis) to white bean plastic materials was effective in improving slightly the mechanical properties in the case of their whole flours products (WWF). The gamma radiation was effective to reduce water absorption only in plastics materials with cellulose–starch content (BWF, WWF) and improved their mechanical properties. The gelatinization process of the moulded material was influenced by the predominant lineal structure of the carbohydrate content. |
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