Identification and characterisation of the chinese herb Langdu by LC-MS/MS analysis.

An LC-MS/MS method has been developed for the identification of three species of herb used as the traditional Chinese medicine Langdu, namely Stellera chamaejasme L., Euphorbia ebracteolata Hayata and E. fischeriana Steud.

Analysis of proprietary Chinese medicines for the presence of toxic ingredients by LC/MS/MS.

This paper presents an LC/MS/MS approach for simultaneous qualitative and quantitative analysis of proprietary Chinese medicine products for the presence of toxic ingredient compounds. The target compounds include three C(19)-diterpenoid alkaloids, two quinolizidine alkaloids, two indole alkaloids and four bufadienolide steroids. They were recognized as active compounds of several toxic/potent herbal materials commonly used in the preparation of some proprietary medicine products.