淀粉
生物塑料
甘油
溶解度
极限抗拉强度
延伸率
材料科学
食品科学
化学工程
化学
复合材料
有机化学
废物管理
工程类
作者
Renata Ferreira Santana,Renata Cristina Ferreira Bonomo,Olga Reinert Ramos Gandolfi,Luciano Miller Reis Rodrigues,Leandro Azevedo Santos,Ana Clarissa dos Santos Pires,Cristiane Moço Canhetti de Oliveira,Rafael da Costa Ilhéu Fontan,Cristiane Martins Veloso
标识
DOI:10.1007/s13197-017-2936-6
摘要
Biodegradable films based on starches from different botanical sources exhibited physicochemical and functional properties which were related with the starch characteristics. However, had inadequate mechanical properties and were hard and brittle. In this research, jackfruit seed starch plasticized with glycerol were developed and characterized. The starch and glycerol concentrations ranged from 2 to 6% w/w and 20 to 60 g/100 g starch, respectively. Bioplastics were obtained by the casting method and characterized in terms of color, mechanical properties, solubility, water vapor permeability (WVP), morphology and free energy of the hydrophobic interaction. Electronic micrographics showed the presence of some intact starch granules. The bioplastics were hydrophilic and those of 6% starch and 40% glycerol were the most hydrophilic ([Formula: see text] = 41.35 mJ m-1). The solubility of the films presented a direct relationship with the starch concentration ranging from 16.42 to 23.26%. Increased opacity and color difference were observed with increasing starch concentration. The WVP ranged from 1.374 × 10-3 to 3.07 × 10-4 g m/day m2 which was positively related with the concentration of starch and glycerol. Tensile strength, percent elongation and Young's Modulus indicated that the jackfruit starch and glycerol provided a film with good mechanical properties. The results replaced that jackfruit starch can be used to develop films, with low opacity, moderate WVP and relatively high mechanical stability, by using glycerol in the gelatinized starch dispersions.
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