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Quantitation of Clonazepam and Its Major Metabolite 7-Aminoclonazepam in Blood by Automated Solid Phase Extraction and Liquid Chromatography-Tandem Mass Spectrometry |
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DOI:10.3969/j.issn.1004-4957.年份.月份 |
KeyWord:clonazepam 7-aminoclonazepam liquid chromatography-tandem mass spectrometry automated solid phase extraction blood |
Author | Institution |
SHI Yin-tao,DUAN Jie,WANG Hui-jun,ZHENG Jing,WANG Jun-wei* |
重庆市公安局物证鉴定中心 |
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Abstract: |
An automated solid phase extraction/liquid chromatography-tandem mass spectrometric(ASPE/LC-MS/MS) method for the quantitative determination of clonazepam and its major metabolite 7-aminoclonazepam in blood.The samples were cleaned up with a C18 solid phase extraction cartridge using methanol as elute solution,and separated on a Waters AtlantisTM dC18 column(150 mm×3.9 mm,5.0 μm) by gradient elution using methanol and water(containing 0.1% formic acid) as mobile phase.The analysis of target compounds were carried out by LC-MS/MS under multiple reaction monitoring(MRM) in positive ionization mode.The calibration curves showed good linearities in the concentration range of 2-1 000 μg/L with correlation coefficients more than 0.995 9.The detection limits of the method were in the range of 0.2-0.5 μg/L.The mean recoveries at three spiked levels of 50,200,1 000 μg/L were in the range of 72.6%-96.3%,with relative standard deviations of 4.2%-10.3%.The proposed method was rapid,sensitive,simple and accurate,and could be used to detect clonazepam and 7-aminoclonazepam in forensic toxicology. |
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