Rhubarb is recorded in the Shennong Ben Cao Jing (Classic of the Materia Medica of the Divine Husbandman) and many other documents, and is used for draining the stomach, strengthening the stomach, clearing heat and detoxifying the toxin. Rhubarb occupies an important position in plant-based laxatives, and is a world-wide raw medicine that has been included in pharmacopoeias of various countries since a long time ago. 大黄的种类繁多，优质大黄是蓼科植物掌叶大黄，大黄及唐古特大黄的根茎及根，大黄中含有多种游离的羟基蒽醌类化合物以及它们与糖所形成的苷。

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