十二烷基硫酸钠改性大豆蛋白塑料的性能和结构  

Properties and structure of sodium dodecyl sulfate modified soybean protein plastics

作　　者：邹文中[1,2] 温其标[3] 杨小泉[3] 温静娴[4] 张小芳[1] 

机构地区：[1]贺州学院化学与生物工程系,广西贺州542800 [2]北海职业学院海洋食品研发中心,广西北海536000 [3]华南理工大学轻工与食品学院,广东广州510640 [4]广西大学材料科学与工程学院,广西南宁530004

出　　处：《粮食与饲料工业》2014年第6期35-38,共4页Cereal & Feed Industry

基　　金：广西自然科学基金项目(桂科自0991268)

摘　　要：以大豆分离蛋白为原料,通过十二烷基硫酸钠(SDS)改性处理和模压成型,制备出SDS改性大豆蛋白塑料,并研究了塑料的性能、结构和形貌。结果表明:当SDS质量分数为18.0%时,该改性塑料的断裂伸长率和断裂能最大,材料的玻璃化转变温度比未SDS改性塑料低43.6℃;随着SDS含量增加,改性塑料的R值减小、吸水率提高;对于9.0%SDS改性塑料,其热失重曲线在第二阶段最大质量损失速率所对应的温度高于SDS的分解温度;红外光谱表明SDS改性塑料中大豆蛋白的酰胺I峰移向高波数;扫描电镜实验证实SDS改性可显著改善大豆蛋白塑料的内部组织结构,并提高其韧性。Soybean protein and sodium dodecyl sulfate（SDS） were mixed at different ratios and hot press molded for making SDS modified soybean protein plastics. The properties, structure and morphology of the plastics were investigated. The results showed that： the soybean protein plastics containing 18.0℃（w/w） SDS had maximum elongation at break and fracture energy, and glass transition temperature of the plastics was 43.6℃ lower than before. Water absorption of the SDS denatured plastics increased with SDS content increasing. The temperature of the maximum weight loss in the second stage of thermogravimetric curve of plastics with 9. 0% SDS was much higher than the decomposition temperature of pure SDS. The results of FTIR showed that amide I band of proteins with SDS shifted to higher frequency. SDS was proved to improve the flexibility and structure of soybean protein plastics by scanning electron microscopy.

关 键 词：大豆蛋白 十二烷基硫酸钠 塑料 结构 性能 

分 类 号：TS229[轻工技术与工程—粮食、油脂及植物蛋白工程] TQ321.4[轻工技术与工程—食品科学与工程]