Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, Laboratorio de Polímeros y Materiales Compuestos (LP&MC), Instituto de Física de Buenos Aires (IFIBA-CONICET), Buenos Aires, Argentina.
Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), CONICET CCT La Plata y Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 y 116 S/N°, B1900JJ, La Plata, Argentina.
Carbohydr Polym. 2019 Mar 15;208:221-231. doi: 10.1016/j.carbpol.2018.12.030. Epub 2018 Dec 11.
Starch films often present high water sensitivity, affecting their barrier and mechanical properties. The effects of processing technique, extrusion/thermo-compression and casting, and lentil protein concentration (0, 0.75 wt.% and 1.5 wt.%) on biodegradable starch films were investigated. Extrusion/thermo-compression process increased in 90% the mechanical resistance of starch films produced following the casting methodology and decreased their moisture content, water solubility and water vapor permeability in 35%, 23%, and 50%, respectively. In the presence of the protein, the mechanical properties (Young modulus and stress at break) and the water tolerance improved due to the crosslinking phenomenon prompted between the protein and the polymeric backbone, being these effects more pronounced on the extruded formulations. All samples resulted thermal stable until 240 °C and biodegraded in compost in 5 weeks. This work revealed that extrusion/thermo-compression process and proteins as crosslinking of starch are two alternatives to improve the drawbacks of starch-based materials.
淀粉膜通常具有较高的水分敏感性，这会影响其阻隔性能和机械性能。本研究考察了加工技术（挤出/热压和浇铸）以及兵豆蛋白浓度（0、0.75wt.%和 1.5wt.%）对可生物降解淀粉膜的影响。挤出/热压工艺使通过浇铸方法制备的淀粉膜的机械强度提高了 90%，同时使水分含量、水溶性和水蒸气透过率分别降低了 35%、23%和 50%。在蛋白质存在的情况下，由于蛋白质与聚合物主链之间的交联现象，力学性能（杨氏模量和断裂应力）和耐水性得到了改善，这种效果在挤出配方中更为明显。所有样品在 240°C 下均热稳定，在堆肥中 5 周内即可生物降解。本工作表明，挤出/热压工艺和蛋白质作为淀粉的交联剂是改善淀粉基材料缺陷的两种选择。
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