目的 为提高葡萄多酚的稳定性和强化缓释效果,采用玉米多孔淀粉为芯材载体复合凝聚法制备葡萄多酚微胶囊。方法 以包埋率为主要指标,通过单因素试验和正交试验考察了各因素对葡萄多酚微胶囊化的影响,并对其制备工艺进行优化。结果 优选的最佳工艺为25 mg/mL葡萄多酚溶液10 mL,玉米多孔淀粉用量1.5 g,在质量浓度0.03 g/mL海藻酸钠溶液30 mL、0.01 g/mL壳聚糖溶液50 mL、0.05 g/mL氯化钙溶液50 mL、pH 3.5时制得的微胶囊外观较优,粒径分布主要在600~850 μm,葡萄多酚包埋率为83.2%,微胶囊产品在模拟胃液和肠液环境中具有很好的释放特性。结论 以玉米多孔淀粉为芯材载体,海藻酸钠-壳聚糖为壁材制备的葡萄多酚微胶囊产品的形态及包埋率要优于单纯的海藻酸钠-壳聚糖微胶囊。用红外光谱和扫描电镜对葡萄多酚缓释微胶囊结构进行表征,均证实包埋物制备成功。

Objective In order to improve the stability of grape polyphenols and strengthen slow-release effect, the study on micro- capisulazed grape polyphenols was carried out through the complex coacervation method using porous cornstarch as core material carrier. Methods With the embedding rate as main index, the effect of all factors on the microencapsulation of grape polyphenols was investigated through the single factor test and orthogonal test, and its preparation technology was also optimized. Results The best preparation technology was as follows: The experiment materials were 10 mL grape polyphenols solution of 25 mg/mL, 1.5 g porous cornstarch, 30 mL sodium alginate solution of 0.03 g/mL, 50 mL chitosan solution of 0.01 g/mL, and 50 mL calcium chloride solution of 0.05 g/mL, at pH value of 3.5. The microcapsules' appearance was superior with size distribution of the main in 600-850 μm, the embedding rate was 83.2%, and they had very good releasing property in simulated gastric and simulated intestinal environment. Conclusion The product appearance and embedding rate of grape polyphenols microcapsules which used porous cornstarch as core material carrier and sodium alginate-chitosan as wall materials are better than those only used sodium alginate and chitosan as wall materials. Furthermore, the inclusion complex is proved to be successfully prepared by its structural characterization which is gotten from FTIR and scanning electron microscope (SEM).

吉林省科技发展计划项目(20120919);吉林省教育厅"十二五"科学技术研究项目(2014129)