title: [Application of equal value derivative spectrophotometry to the determination of coptis alkali in wanshi niuhuang qingxin pills].
abstract: The total coptis alkaloids Wanshi Niuhang Qingxin Pills were determined by equal value derivative spectrophotometry in this paper. Quantitative analysis of six mixtures of medicinal herbs can be done easily on the extract. The average recovery of berberine.HCl is 98.55 +/- 1.90% (CV). The method features good reproducibility, favorable stability and high sensitivity.
authors.affiliation: Shanolong Province, Weifang Iastitute for Drug Control.
authors.forename: L
authors.initials: L
authors.lastname: Lin
mesh_terms: D000470:Alkaloids / Q000032:analysis*; D001599:Berberine / Q000032:analysis; D004338:Drug Combinations; D004365:Drugs, Chinese Herbal / Q000032:analysis*; D013053:Spectrophotometry / Q000379:methods
chemical_list: D000470:Alkaloids; D004338:Drug Combinations; D004365:Drugs, Chinese Herbal; D001599:Berberine