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在日本,富含单宁的野桐(Mallotus japonicus)(大戟科植物)的皮和叶,被用来治疗胃溃疡病。本报告作者已从中分离出一种新的称之为野桐精酸(mallotusinic acid)(1)的水解类单宁,以及野桐宁(geraniin)(2)作为叶子的主要成份,另外也发现了一种新的水解类单宁,称之为野桐亭酸(mallotinic acid)(3)。其方法是:将叶子在丙酮和水的混合物中搅匀,再用醋酸乙酯提取浓溶液。用上行滴入逆流色层法,并用正丁醇-醋酸-水(4:1:5)展开剂来分离醋酸乙酯提出物。夹杂有野桐宁的野桐精酸是继芸香甙和野桐宁之后的组份中分离得到的。用醋酸乙酯提取,调
In Japan, the tannin-rich skin and leaves of Mallotus japonicus (Euphorbiaceae) are used to treat stomach ulcers. The authors of this report have isolated a new type of hydrolyzable tannin known as mallotusinic acid (1) and geraniin (2) as the main components of the leaves. A new type of hydrolyzable tannin is called mallotinic acid (3). This is done by stirring the leaves in a mixture of acetone and water and extracting the concentrated solution with ethyl acetate. Elution was added dropwise to the countercurrent chromatography and the ethyl acetate extract was isolated using n-butanol-acetic acid-water (4:1:5) developer. The wild tungtonic acid, which is contaminated with wild tungnin, was isolated from the components of pupa and tunguine. Extracted with ethyl acetate, adjusted