The Interaction of Oil Microcapsule Wall Materials between Whey Protein and Acacia
SHI Yan1, LI Ru-yi1, WANG Hui1, LI Qian1, LI De-jun1, TU Zong-cai1, 2
1. State Key Laboratory of Food Science and Technology and Departmentof Food Science and Engineering, Nanchang University, Nanchang 330047, China 2. Jiangxi Normal University, Nanchang 330022, China
Abstract：The interaction between whey protein and acacia which were used as wall materialwas studied on the formation of the oils microcapsules by the FTIR Spectroscopyand Computer Aided Analysis. The results indicated that whey protein changed obviously in amide A and amideⅠ by high pressured homogenization and spray-drying. The amide A moved from 3 406.5 cm-1 to 3 425.4 cm-1 which was possiblydue to covalent cross-linking between whey protein and acacia. Furthermore theamide Ⅰ moved from 1 648.6 cm-1 to 1 654.7cm-1 for intramolecular hydrogen bonding of protein had been weaken. After Gaussian fitting on amide Ⅰ, it was found that the content of secondary structure of α-helix content andβ-fol.ding in whey protein reduced from 19.55% to 17.50% and from 30.59% to 25.63%, respectively. This suggests that protein intramolecular hydrogen bonding force was abated, resulting in abating the rigid structure of the protein molecules and enhancing of the toughness structure. The protein molecules showed some flexibility. The result of SDS-PAGE electrophoresis showed that whey protein -gum Arabic complexes produced covalent products in larger molecular weight. During the spray-drying process, covalent cross-linking produced between whey protein and gum Arabic which improved emulsifying activity of the complex whey protein and gum Arabic produced covalent cross-linking and improved the complex emulsifying activity. Observing the surface structure of the fish oil microcapsule by SEM, the compound of whey protein and acacia as wall material was proved better toughness, less micropore, and more compact structure.
石 燕1 ，李如一1，王 辉1，李 倩1 ，李德俊1，涂宗财1, 2 . 油脂微胶囊壁材乳清蛋白与阿拉伯胶相互作用研究 [J]. 光谱学与光谱分析, 2015, 35(03): 617-621.
SHI Yan1, LI Ru-yi1, WANG Hui1, LI Qian1, LI De-jun1, TU Zong-cai1, 2 . The Interaction of Oil Microcapsule Wall Materials between Whey Protein and Acacia . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(03): 617-621.
