The contents of the volatile principles, butylidenephthalide, ligustilide, butylphthalide, and the carboxylic acids, ferulic acid, nicotinic acid, in six tang-kuei (Angelicae radix) crude drugs were determined by high performance liquid chromatography. Experimental data showed great divergence in the medicinally active constituents and their ratios among the various tan g-kuei samples from different species with different prices. All parts of the tang-kuei plant contain the volatile active constituents, with the leaves and branching roots containing the most.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.