茶多酚的提取及微胶囊化工艺研究

本文采用正交实验，对影响茶叶中茶多酚浸出率及茶多酚微胶囊化包埋效果的因素进行分析，确定茶多酚的提取及微胶囊化工艺条件。结果表明：茶多酚最佳浸提条件为：茶叶末用70％的乙醇溶液室温下浸提二次，每次1h：茶多酚微囊化包埋最佳条件为：采用3％的海藻酸钠（海藻酸钠：茶多酚=3：1）、1％壳聚糖和3％的氯化钙体系，用一步法制备茶多酚微胶囊，该微胶囊在体外模拟胃、肠液中约2h中达到茶多酚释放峰值，表现出较好的缓释效果。

Extraction and Microencapsulation of Tea Polyphenols

In this paper, the extraction and microencapsulation technology of tea polyphenols were studied. Results showed:(1)The optimum conditions for tea polyphenols extraction from tea were as follows: extracting with 70% ethyl alcohol at room temperature 3 times and 1.0h each time. (2) The optimum conditions for tea polyphenols microencapsulation with chitosan-alginate sodium system were as follows: 3% alginate(alginate sodium/ tea polyphenols=5:1) 1% chitosan and 3% calcium chloride by one- step mothod to prepare the tea polyphenols' microencapsule. In vitro release studies, results showed that the microcapsules could realizes ustainedrel easei nt he intestine.