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大黄为蓼科植物掌叶大黄、唐古特大黄或药用大黄的干燥根及根茎。其主要化学成分为蒽苷类及游离蒽醌衍生物 ,其中游离蒽醌衍生物约占蒽醌类总量的 1/ 10 - 1/ 15 ,包括大黄酸、大黄素、大黄酚、芦荟大黄素及大黄素甲醚。大黄性寒、味苦 ,具有泻热通肠、凉血解毒、逐瘀通经的功
Rhubarb is the dry root and rhizome of Rheum palmatum, Rheum tangutum, or medicinal rhubarb. The main chemical constituents are glycosides and free hydrazine derivatives, among which the free hydrazine derivatives account for about 1/10 - 1/15 of the total hydrazines, including rhein, emodin, chrysophanol, aloe-emodin. And rhubarb. Rhubarb is cold, bitter, with diarrhea, bowel, cooling blood, detoxification, and euphemism.