油酸和甘油对玉米醇溶蛋白膜增塑的协同效应。

Synergistic effect of oleic acid and glycerol on zein film plasticization.

机构信息

State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University , Wuxi, China 214122.

出版信息

J Agric Food Chem. 2012 Oct 10;60(40):10075-81. doi: 10.1021/jf302940j. Epub 2012 Sep 27.

DOI:10.1021/jf302940j

PMID:22989052

Abstract

Oleic acid and glycerol are two different molecules with different plasticization mechanisms, and their effects on the mechanical properties of zein film were investigated. The mechanical parameters of tensile strength (TS) and elongation to break (E) were improved by either oleic acid or glycerol in a dose-dependent manner up to 20%. When a combination of the two plasticizers in different ratios was used to make zein films, the highest TS was observed at a ratio of 3:1 of oleic acid to glycerol, and a synergy between them was revealed through a statistical analysis. A significant decrease of glass transition temperature (Tg) and different microscopic patterns examined by scanning electronic microscopy (SEM) indicate the supramolecular structure was changed by the plasticizers. A combination of plasticizers with different plasticization mechanisms might be a better way to synergistically improve the mechanical properties of biopolymer-based films for practical applications.

摘要

油酸和甘油是两种具有不同塑化机制的分子，它们对玉米醇溶蛋白膜的机械性能的影响进行了研究。通过在不同剂量下添加油酸或甘油，机械性能参数拉伸强度（TS）和断裂伸长率（E）都得到了改善，最高可达 20%。当两种增塑剂以不同比例组合用于制备玉米醇溶蛋白膜时，在油酸和甘油的比例为 3:1 时观察到最高的 TS，并且通过统计分析揭示了它们之间的协同作用。玻璃化转变温度（Tg）的显著降低和扫描电子显微镜（SEM）检查到的不同微观形态表明，增塑剂改变了超分子结构。具有不同塑化机制的增塑剂的组合可能是协同改善基于生物聚合物的薄膜机械性能的更好方法，以满足实际应用的需求。