【摘要】 目的 实现蒙古栎淀粉资源的高值化、功能化应用。方法 选用高碘酸钠氧化改性蒙古栎淀粉制备双醛蒙古栎淀粉，以醛基取代度为指标研究氧化条件；将双醛蒙古栎淀粉与阿拉伯胶组成复合壁材包埋茶多酚制备缓释微胶囊，并通过PB试验和响应面分析优化反应条件，研究其多酚包埋效果及缓释性。结果 当氧化温度为35℃,氧化时间为3 h,且氧化pH 2时，NaIO₄与蒙古栎淀粉摩尔比小于0.65时，双醛取代度与氧化剂用量近似线性关系；微胶囊最佳制备条件为醛基取代度为65%,芯壁比为1∶3.5,壁材比为1∶1,固液比为1∶40,包埋时间为4.0 h,包埋温度为50℃,乳化剂用量为4 wt%。此条件下制备的微胶囊包埋率为90.856%。结论微胶囊的含蒙古栎双醛淀粉壁材结构能选择性地在肠环境溶解并释放茶多酚，实现定向释放，具备选择性缓释效果。更多还原

【Abstract】 OBJECTIVE To achieve high-value and functional applications of Mongolian oak starch resources.METHODS Dialdehyde Mongolian oak starch was prepared by modifying Mongolian oak starch with NaIO₄, using the degree of aldehyde substitution as an indicator to study the oxidation conditions. The dialdehyde Mongolian oak starch was then combined with gum arabic to create a composite wall material for encapsulating tea polyphenols, and the reaction conditions were optimized through PB tests and response surface analysis to investigate the encapsulation efficiency and sustained release properties of the polyphenols.RESULTS When the oxidation temperature was 35℃, oxidation time was 3 hours, and the oxidation pH was 2, a nearly linear relationship was observed between the degree of double aldehyde substitution and the amount of oxidizing agent when the molar ratio of NaIO₄ to Mongolian oak starch was less than 0.65. The optimal preparation conditions for the microcapsules were a degree of aldehyde substitution of 65%, a core-to-wall ratio of 1∶3.5, a wall material ratio of 1∶1, a solid-to-liquid ratio of 1∶40, encapsulation time of 4.0 hours, encapsulation temperature of 50℃, and an emulsifier dosage of 4 wt%. Under these conditions, the encapsulation efficiency of the microcapsules reached 90.856%.CONCLUSION The microcapsules containing double aldehyde Mongolian oak starch wall material can selectively dissolve in intestinal environments and release tea polyphenols, achieving targeted release and demonstrating selective sustained-release effects.更多还原