title: [Analysis of ginsenosides in Sheng-Mai-Yin decoction by high performance liquid chromatography-diode array detection-electrospray mass spectrometry].
abstract: A method of high performance liquid chromatography coupled with diode array detection and electrospray ionization mass spectrometry (HPLC-DAD/MS) in negative ion mode was developed for the analysis of ginsenosides in Sheng-Mai-Yin decoction (Panax gingeng C. A. Mey, Ophiopogon japonicus (Thunb.) Ker-Gawl, Shisandra chinensis (Turcz.) Baill.). The analyses were preformed on a reversed-phase C18 column (4.6 mm i.d. x 150 mm, 5 microm) using a binary eluent (10 mmol/L ammonium acetate (A) and acetonitrile (B), 1 mL/min) under gradient conditions (60% A - 40% A at 0 - 30 min, 40% A - 30% A at 30 - 40 min). Seventeen ginsenosides (20 (R) -Rh1, Rh2, Rg3, Rg2; 20 (S) -Rh1, Rh2, Rg3, Rg2; Rf, Rg6, Rg5, F4, Rk1, Rk3, Rh4; 20 (S)- and 20 (R) -protopanaxatriol) were well separated and detected at 203 nm by a DAD detector. The effluent from the DAD detector was introduced into the electrospray ionization (ESI) source in a post-column splitting flow rate at 0.3 mL/min. In the mass spectrum two major ions [M - H]- and [M + AcO]- were observed for ginsenoside standards (20 (R) -Rh1, Rg3, Rh2; 20 (S) -Rh1, Rg3, Rh2; 20 (S)- and 20 (R) -protopanaxatriol) and ginsenosides in Sheng-Mai-Yin decoction. Some other ions [M - Glc - H]-, [M - 2Glc - H]-, [M - Rha - H- and [M - Rha - Glc - H]- were also found in the mass spectrum of ginsenosides of Sheng-Mai-Yin decoction. In the decoction process ginsenosides changed into constituents of moderate and low polarity by hydrolysis, isomerization and dehydration at the site of C-20 and hydrolysis reaction also occurred at the site of C-3 or C-6. The work above presents a quick and accurate assay method which can could be used for the qualitative analysis of ginsenosides in Sheng-Mai-Yin decoction and the quality control of Sheng-Mai-Yin preparation.
authors.affiliation: Research Laboratory of Traditional Chinese Medicine, School of Pharmaceutical Sciences, Peking University, Beijing 100083, China.
authors.forename: Zhanliang
authors.initials: Z
authors.lastname: Wang
authors.forename: Hong
authors.initials: H
authors.lastname: Wang
authors.forename: Shizhong
authors.initials: S
authors.lastname: Chen
mesh_terms: D000097:Acetonitriles; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004365:Drugs, Chinese Herbal / Q000737:chemistry; D036145:Ginsenosides / Q000032:analysis*; D013058:Mass Spectrometry; D008516:Medicine, Chinese Traditional; D005894:Panax / Q000737:chemistry; D008517:Phytotherapy; D010936:Plant Extracts / Q000737:chemistry; D011786:Quality Control; D012502:Sapogenins / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D000097:Acetonitriles; D004365:Drugs, Chinese Herbal; D036145:Ginsenosides; D010936:Plant Extracts; D012502:Sapogenins; C081552:protopanaxatriol; C032159:acetonitrile