O/W体系微胶囊壁结构形成中蛋白质与碳水化合物的相互作用

Interaction between Protein and Carbohydrate in O/W Based Microcapsule Wall Formation

本文用傅立叶转换红外光谱法研究了水解大豆蛋白(SPH)壁材微胶囊中蛋白质的结构。结果表明,蔗糖中的羟基与蛋白质中酰胺Ⅱ的羰基发生有效的氢键缔合,能减弱喷雾干燥过程中蔗糖与SPH间的相互作用所导致的蛋白质膜的不均匀收缩作用,所以该壁的结构较为均匀完整。用扫描电镜(SEM)观察了微胶囊的超微结构,发现微胶囊的形态学性质受到壁组成和蛋白质与碳水化合物相互作用的重大影响。水解大豆蛋白/蔗糖(SPH/S)壁材的微胶囊表面没有凹坑,而水解大豆蛋白/麦芽糊精(SPH╱MD)壁材的表面有凹坑。微胶囊的内部结构分析进一步证实了SPH/S壁材微胶囊的密度和完整性。

The protein conformation in soybean protein hydrolyze (SPH) based microcapsules was studied by fourier transform In-fraed spetra. The result showed that the hydroxyl group of surcose fonned hydrogen bonds with carbonyl group of amide Ⅱin the protein, the interaction between surcose and SPH reduced uneven shrinkage of the proteinic film during spray drying, so the wall structure was more integrated. The microstructure of microcapsules was observed by SEM. It discovered that the morphological properties of microeapsules were significantly influenced by the wall composition and the interaction between protein and carbohydrate. There was no surface dents in SPH/S based microeapsules, but SPH/MD based microcpasules had surface dents. Analysis of the inner structure of microcapsules confirmed the density and integrity of the SPH/S based microeapsules.