包埋高含量天然VE 油微胶囊粉的性质表征

研究以变性淀粉为壁材包埋高含量天然VE 油微胶囊粉的性质表征。采用紫外分光光度法、石油醚萃取法、激光扫描粒度仪、环境扫描电镜分别测定天然VE 油微胶囊粉的VE 含量、表面VE 含量、复原乳状液粒径分布、表面超微结构。结果表明：天然VE 油微胶囊粉VE 含量高达30%，贮藏6 个月后表面VE 油含量低于5%，复原乳状液粒径分布窄，表面超微结构致密。表明以34.5% 的变性淀粉为壁材，复配乳化剂1(亲油性)与乳化剂2(亲水性)总用量为3%，芯材62.5% 的天然VE 油所构成的乳化体系稳定，喷雾干燥得到的高含量天然VE 油微胶囊粉性质优良。

Characterization of High Content Natural Vitamin E Oil Microcapsules

In this study, natural vitamin E oil with a content of 62.5% was embedded using modified starch as the wall material and mixed lipophilic and hydrophilic emulsifiers with a total amount of 3%. The properties of the microcapsules obtained were studied by using ultraviolet spectrometry, petroleum ether extraction, laser scanning particle size analyzer, environmental scanning electron microscope (ESEM) to measure total and surface vitamin E contents, the particle size distribution of the reconstituted emulsion and surface microstructure, respectively. The results showed that the total vitamin E content of freshly prepared microcapsules was as high as 30% and after 6-month storage, the surface vitamin E content decreased to smaller than 5%. The reconstituted emulsion displayed a narrow particle size distribution spectrum. Moreover, a compact structure was observed for both freshly prepared and stored microcapsules. Therefore, modified starch, vitamin E oil and a mixture of lipophilic and hydrophilic emulsifiers can compose a stable emulsifying system and the vitamin E oil microcapsules obtained by spray drying have excellent properties.