title: Simultaneous separation and determination of active components in Cordyceps sinensis and Cordyceps militarris by LC/ESI-MS.
abstract: A simple and rapid isocratic LC/MS coupled with electrospray ionization (ESI) method for simultaneous separation and determination of adenine, hypoxanthine, adenosine and cordycepin in Cordyceps sinensis (Cs) and its substitutes was developed. 2-Chloroadenosine was used as internal standard for this assay. The optimum separation for these analytes was achieved using the mixture of water, methanol and formic acid (85:14:1, v/v/v) as a mobile phase and a 2.0 x 150 mm Shimadzu VP-ODS column. Selective ion monitoring (SIM) mode ([M+H]+ at m/z 136, 137, 268, 252 and 302) was used for quantitative analysis of above four active components. The regression equations were liner in the range of 1.4-140.0 microg ml(-1) for adenine, 0.6-117.5 microg ml(-1) for hypoxanthine, 0.5-128.5 microg ml(-1) for adenosine and 0.5-131.5 microg ml(-1) for cordycepin. The limits of quantitation (LOQ) and detection (LOD) were, respectively 1.4 and 0.5 microg ml(-1) for adenine, 0.6 and 0.2 microg ml(-1) for hypoxanthine, 0.5 and 0.1 microg ml(-1) for adenosine and cordycepin. The recoveries of four constituents were from 93.5 to 107.0%. The nucleoside contents of various types of natural Cs and its substitutes were determined and compared with this developed method.
authors.affiliation: Research Center of Modernization of Chinese Herbal Medicines, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China.
authors.forename: Lan-Fang
authors.initials: LF
authors.lastname: Huang
authors.forename: Yi-Zeng
authors.initials: YZ
authors.lastname: Liang
authors.forename: Fang-Qiu
authors.initials: FQ
authors.lastname: Guo
authors.forename: Zhi-Feng
authors.initials: ZF
authors.lastname: Zhou
authors.forename: Ben-Mei
authors.initials: BM
authors.lastname: Cheng
mesh_terms: D000225:Adenine / Q000032:analysis; D000241:Adenosine / Q000032:analysis; D032661:Cordyceps / Q000737:chemistry* / Q000254:growth & development / Q000302:isolation & purification*; D003839:Deoxyadenosines / Q000032:analysis; D004365:Drugs, Chinese Herbal / Q000032:analysis; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D019271:Hypoxanthine / Q000032:analysis; D009705:Nucleosides / Q000032:analysis; D025341:Principal Component Analysis / Q000379:methods; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D003839:Deoxyadenosines; D004365:Drugs, Chinese Herbal; D009705:Nucleosides; D019271:Hypoxanthine; C058120:cordycepin; D000225:Adenine; D000241:Adenosine