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。
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.
方法：以黄连生物碱提取量为考察指标，采用紫外分光光度法测定黄连生物碱含量，对两种水提取方法进行比较。
Method: The contents of Rhizoma Coptidis alkaloids extracted, which were regarded as index, were determined by Ultravio - let spectrophotometry and both water extractive processes were compared.
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.
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