Effects of gamma radiation on a plastic material based on bean protein
The effect of gamma radiation applied to a system used for the preparation of biodegradable plastics was studied. The system was composed of the proteins and glucopolysaccharides previously isolated from Phaseolus vulgaris beans, mixed with glycerol and water as plasticizers. The irradiation of mixt...
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2002
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00914037_v51_n8_p721_Gonzalez http://hdl.handle.net/20.500.12110/paper_00914037_v51_n8_p721_Gonzalez |
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| Sumario: | The effect of gamma radiation applied to a system used for the preparation of biodegradable plastics was studied. The system was composed of the proteins and glucopolysaccharides previously isolated from Phaseolus vulgaris beans, mixed with glycerol and water as plasticizers. The irradiation of mixtures with doses of 25, 50 and 100kGy was carried out in two conditions: (a) before the compression molding process and (b) after mixtures were molded. When the maximum applied dose (100kGy) was applied to mixtures before the molding process, the plastic product obtained presented a deformation reduction of 62%, while the water absorption capacity increased by 20%. When the previously molded products were submitted to gamma radiation, their tensile strength decreased by 20%. The observed effects were attributed to different water content in each mixture and the eventual possibility of rearrangements giving rise to different structural interactions among starch and protein chains. A comparative analysis of biodegradability between irradiated and non-irradiated products is being carried on, with no differences observed up to the present state of the experiments. Copyright © 2002 Taylor and Francis. |
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