黄连碱，浅黄色针状结晶 （乙醇）, 熔点218°。极略微溶于水， 微溶于乙醇， 溶于碱。是中药黄连的特征性成分。
非洲防已碱是一种与黄连素联系密切的生物碱。
The primary active ingredienn are berberine and hydrastine alkaloids, among others.
白毛茛不含有该生物碱，但是人们在中药黄连中发现了它的存在。
Palmatine, which is closely related to berberine, is not found in Goldenseal, but is found in the Chinese medicinal plant Huanglian.
对从黄连中提取小檗碱成分的超声技术工艺进行了系统的实验研究，给出了超声提取小檗碱的最佳工艺参数。
The techniques of extracting berberine from rhizoma of Coptis chinese by ultrasound are studied by experiment systematically. The OPtimum parameters for extraction berberine are proposed.
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