Analysis of six synthetic adulterants in herbal weight-reducing dietary supplements by LC electrospray ionization-MS.
A liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS) method was developed for the simultaneous determination of six synthetic adulterants, namely fenfluramine, phenolphthalein, N-di-desmethyl sibutramine, N-mono-desmethyl sibutramine, sibutramine, and orlistat. The method was applied to the analysis of herbal weight-reducing dietary supplements. Chromatographic separation of the analytes on a C(8) reversed-phase column was achieved using a gradient elution of solvent A: acetonitrile and solvent B: aqueous 20 mM ammonium formate solution. Sildenafil was utilized as an internal standard for quantification. The MS detector was operated in positive electrospray ionization mode. Selected-ion monitoring (SIM) was carried out for m/z 232, 319, 252, 266, 280, 496, and 475 for fenfluramine, phenolphthalein, N-di-desmethyl sibutramine, N-mono-desmethyl sibutramine, sibutramine, orlistat, and sildenafil, respectively. The method was validated for accuracy, precision, linearity, and selectivity. The limits of detection for the six synthetic adulterants ranged from 0.0018 to 0.73 microg g(-1). The proposed method was used for a small survey of 22 dietary supplements of which eleven samples were adulterated with phenolphthalein, N-mono-desmethyl sibutramine, and sibutramine at levels from 0.212 to 96.2 mg g(-1).
Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, Hunan Normal University, Changsha, China.
J
J
Wang
B
B
Chen
S
S
Yao
D019440:Anti-Obesity Agents / Q000032:analysis*; D002853:Chromatography, Liquid / Q000379:methods; D019587:Dietary Supplements / Q000032:analysis*; D004340:Drug Contamination; D004348:Drug Labeling; D009765:Obesity / Q000178:diet therapy; D004364:Pharmaceutical Preparations / Q000032:analysis* / Q000737:chemistry; D028321:Plant Preparations / Q000032:analysis* / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods
D019440:Anti-Obesity Agents; D004364:Pharmaceutical Preparations; D028321:Plant Preparations