Enantiomeric Separation and Determination of the Enantiomers of Oxazepam and Temazepam in Aquaculture Products by Liquid Chromatography-Tandem Mass Spectrometry
Scientific Papers|更新时间:2025-03-17
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Enantiomeric Separation and Determination of the Enantiomers of Oxazepam and Temazepam in Aquaculture Products by Liquid Chromatography-Tandem Mass Spectrometry
Journal of Instrumental AnalysisVol. 44, Issue 3, Pages: 479-485(2025)
WANG Xu-feng,WANG Qiang,HOU Chao-ping,YANG Jin-lan,LI Zhi-guang,ZHANG Ying-xia,LI Hui-qing,HUANG Ke.Enantiomeric Separation and Determination of the Enantiomers of Oxazepam and Temazepam in Aquaculture Products by Liquid Chromatography-Tandem Mass Spectrometry[J].Journal of Instrumental Analysis,2025,44(03):479-485.
WANG Xu-feng,WANG Qiang,HOU Chao-ping,YANG Jin-lan,LI Zhi-guang,ZHANG Ying-xia,LI Hui-qing,HUANG Ke.Enantiomeric Separation and Determination of the Enantiomers of Oxazepam and Temazepam in Aquaculture Products by Liquid Chromatography-Tandem Mass Spectrometry[J].Journal of Instrumental Analysis,2025,44(03):479-485. DOI: 10.12452/j.fxcsxb.240628178.
Enantiomeric Separation and Determination of the Enantiomers of Oxazepam and Temazepam in Aquaculture Products by Liquid Chromatography-Tandem Mass Spectrometry
An analytical method was proposed for the enantiomeric separation and residual determination of the enantiomers of oxazepam and temazepam in aquaculture products by liquid chromatography-tandem mass spectrometry(LC-MS/MS). Samples were extracted twice with acetonitrile and the centrifuged extractions were blew to dryness under nitrogen gas at 40 ℃. Then,the dried residues were dissolved with 2 mL 50% acetonitrile-
water solution,followed by dispersive solid phase extraction(dSPE) cleanup protocol prior to be injected into LC-MS/MS. The chromatographic separation of the targeted enantiomers of oxazepam and temazepam were conducted on an EnantioPAK
®
Y1-R column(5 μm,150 mm×4.6 mm) under isocratic elution procedure,utilizing acetonitrile and 0.1% formic acid-5 mmol/L ammonium acetate solution as mobile phases. The targeted enantiomers were determined with internal standard method,operating in positive electrospray ionization scanning mode(ESI
+
) and multiple reaction monitoring(MRM) mode. Excellent linearity for four targeted enantiomers were prepared in the concentration ranges of 0.5-50 μg/L,with correlation coefficients(
r
2
) not less than 0.999 0. The limits of detection(LODs) and the limits of quantitation(LOQs) in aquaculture product samples were 0.2 μg/kg and 0.5 μg/kg,respectively. The average recoveries of targeted enantiomers fortified in five negative sample matrixes at three spiked concentration levels ranged from 82.6% to 107%,with relative standard deviations(RSDs,
n=
6) not more than 9.2%. The newly developed method is sensitive and reliable,and is suitable for the residue analysis of the enantiomers of oxazepam and temazepam in various aquaculture product matrixes.
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