A sensitive and specific liquid chromatography mass spectrometry method for simultaneous determination of berberine, palmatine, coptisine, epiberberine and jatrorrhizine from Coptidis Rhizoma in rat plasma - Yu, S; Pang, X; Deng, Y; Liu, L; Liang, Y; Liu, X; Xie, L; Wang, G; Wang, X (Int J Mass Spectrom, 2007)