维生素E微胶囊的理化性质表征

采用超声波辅助β-环糊精(β-CD)对维生素E进行包埋,而后再加入乳清浓缩蛋白(WPC)对其进行二次包埋来制备维生素E微胶囊.通过扫描电镜(SEM)发现微胶囊产品与物理混合物的微观形态存在较大差异;在微胶囊产品的差示热扫描(DSC)图谱中出现了一个新的吸热峰;傅里叶变换红外光谱(FT-IR)显示,在微胶囊产品中没有发现维生素E的特征峰并且存在较强的氢键效应;微胶囊产品的X-射线衍射图谱与物理混合物以及β-环糊精的图谱大不相同,在多处变化明显;以上的实验结果证实了维生素E已经被β-环糊精和乳清浓缩蛋白包埋,并且维生素E与β-环糊精之间发生氢键作用形成包合物.

Physicochemical characteristics of microencapsulated vitamin E

Vitamin E was microencapsulated in β-cyclodextrin with ultrasound-assisted and then em-bedded in whey protein concentrate.The results of SEM showed that the microstructures of microcapsules were very different from that of physical mixtures.A new endothermic peak appeared on the DSC patterns of microencapsulated vitamin E.The result of FT-IR revealed that the characteristic peaks of vitamin E did not exist on IR spectrograms of microcapsules,and there was strong hydrogen bending effect in prod-ucts.There were many obvious changes on X-ray diffraction patterns of the microencapsulated vitamin E,compared to patterns of physical mixtures and β-cyclodextrin.These results showed that vitamin E had been embedded in β-cyelodextrin and whey protein concentrate,and there were strong hydrogen bonding effects between vitamin E and β-cyclodextrin.