title: High-performance liquid chromatography-diode array detection/electrospray ionization mass spectrometry for the simultaneous analysis of cis-, trans- and dihydro-2-glucosyloxycinnamic acid derivatives from Dendrobium medicinal plants.
abstract: Sensitive, selective and reliable high-performance liquid chromatography (HPLC)-diode array detection (DAD)/electrospray ionization multi-stage mass spectrometry (ESI-MSn) methods have been developed for the characterization of nine 2-glucosyloxycinnamic acid derivatives and quantitative analysis of three of the major 2-glucosyloxycinnamic acids, cis-melilotoside, trans-melilotoside and dihydromelilotoside, present in Dendrobium medicinal plants. The identities of the latter three major 2-glucosyloxycinnamic acids were confirmed by comparing their retention times, UV and mass spectra with those of the reference standards. The characteristic ESI-MSn fragmentation patterns of the remaining six 2-glucosyloxycinnamic acid derivatives, which are similar to the three major compounds, have allowed the putative elucidation of their structures. The concentrations of the cis-, trans- and dihydromelilotosides were simultaneously determined by HPLC/ESI-MS2 using the multiple reaction monitoring (MRM) mode in extracts of Dendrobium species. The method was validated with respect to the overall intra- and inter-day variation (RSD less than 8%) and the limits of quantification for the cis-, trans- and dihydromelilotosides were 0.09, 0.09 and 0.01 microg/mL, respectively.
authors.affiliation: Key Laboratory of Standardization of Chinese Medicines of Ministry of Education, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Zhangjiang Hi-tech Park, Shanghai 201203, P. R. China.
authors.forename: Li
authors.initials: L
authors.lastname: Yang
authors.forename: Norio
authors.initials: N
authors.lastname: Nakamura
authors.forename: Masao
authors.initials: M
authors.lastname: Hattori
authors.forename: Zhengtao
authors.initials: Z
authors.lastname: Wang
authors.forename: S W Annie
authors.initials: SW
authors.lastname: Bligh
authors.forename: Luoshan
authors.initials: L
authors.lastname: Xu
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D002934:Cinnamates / Q000032:analysis* / Q000737:chemistry; D031667:Dendrobium / Q000737:chemistry*; D004365:Drugs, Chinese Herbal / Q000032:analysis / Q000737:chemistry*; D005960:Glucosides / Q000032:analysis* / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013237:Stereoisomerism
chemical_list: C521677:2-glucosyloxycinnamic acid; D002934:Cinnamates; D004365:Drugs, Chinese Herbal; D005960:Glucosides