Emodin is found in a variety of plants. It is available in the domestic market currently has three sources: giant knot weed, rhubarb and aloe. Rhubarb is the source of the comparative ”authentic”, and the high price is the first of the three. But the top-sale source in the market is giant knot weed.

Rhubarb is a good medicine with long history, exact curative effect and low price. It is an important raw material for dozens of Chinese patent medicine, such as Shangqing Pill, Dahuang Qingwei Pill, Baishun Pill and so on. With the incessant logging and natural disasters in recent years, the wild resources of rhubarb have been declining and the price of raw materials has been rising. The price of extract from rhubarb also rose. In tradition, the extraction of rhubarb is good and generally mainly domestic pharmaceutical factory, domestic suppliers are not many.

The supply from giant knot weed is relatively common at present. The color is different, some of them are black, and some domestic pharmaceutical factories tend to yellow. As there is a serious lack of standards in the country, the price also varies different in domestic, from tens of yuan one kilogram to hundreds of yuan a kilogram.

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