从五倍子中提取单宁酸，通过正交实验优化筛选出最佳工艺。
To study the optimal process of the extraction of tannic acid from Chinese gallnut.
以五倍子为原料浸取单宁酸，由单宁酸氧化制备鞣花酸。
The ellagic acid has been prepared by oxidation of the leaching solution of Chinese gallnut containing tannic acid.
酿造单宁是以天然五倍子为原料，用物理方法提纯可直接用于食物和入药，已纳入我国食品添加剂目录（ 编号为2201） 。
The material of brewing tannin is natural gallnut, it can be directly used in food and medicine by physical purifying and it has brought into the catalogue of Chinese food additives(No. 2201).
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