Abstract
A sensitive and specific liquid chromatography-electrospray ionization mass spectrometry (LC/ESI-MS) method was developed for the analysis of 18 drugs used for the treatment of anti-hypertension, including diuretics, calcium antagonists, and angiogenesis-converting enzyme inhibitors (ACEI) as adulterants in dietary supplements and traditional Chinese medicines. Separation was accomplished on a Xtimate™ C18 reversed-phase column using a mixture of methanol, acetonitrile and 20 mM ammonium formate buffer (pH 3.2) as mobile phase. The method demonstrated linearity from 0.03 to 21.52 mg kg−1. Limits of detection ranged from 6.5 to 86.0 µg kg−1. The recoveries of spiked samples ranged from 71% to 109%. The procedure was successfully applied in routine inspection analysis.
Acknowledgements
This work was financially supported by the National ‘973’ project (Grant Number 2006CB504701), the National Natural Science Foundation of China (Grant Numbers 20875028, 20080542003, and 2008[890]), and the Science Research Foundation of Hunan province (Grant Numbers 2007FJ1005 and 2008FJ3063).