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Chen C.,Institute of Forensic Science of Ministry of Justice | Chen C.,U.S. Center for Disease Control and Prevention | Chen C.,Fudan University | Yan H.,Institute of Forensic Science of Ministry of Justice | And 2 more authors.
Chinese Journal of Chromatography (Se Pu) | Year: 2012

A fast method for the quantitative determination of penicillin G PEN G, penicilloic acid and penilloic acid in blood with ultra performance liquid chromatography-electrospray tandem mass spectrometry was developed. A simple deproteinization of the blood was used with a mixed solution of acetonitrile and water 4: I, v/v as extraction solvent. The blood extract was directly injected onto an LC column. The chromatographic separation of the components was performed on a BEH C18 column 50 mm × 2.1 mm, 1.7 μm using acetonitrile and water containing 0.1% formic acid. The mass spectrometer was operated in positive electrospray ion mode. Finally, the analysis was carried out with multiple reaction monitoring MRM mode. The limits of detection LODs for these three compounds were in the range of 0.1 to 2.0 ng/mL aad the limits of quantification LOQs in the range of 0.5 to 5.0 ng/mL. Within the linear range, the correlation coefficients r of PEN G and its metabolites were all more than 0. 997 4. Accuracies for these targeted compounds were ranged from 92.3% to 105.5%, and the within-day precisions were less than 10%. The stabilities of the components were evaluated in the temperature range from 18 to - 80 °C, and the mass concentration of penicillin G was decreased significantly with the extensions of storage temperature and storage time. Biological samples of the rats medicated with PEN G were analyzed using the developed method. The results show that PEN G can just be detected at 0.5 h after administration. However; the detection time limitation of penicilloic acid can be extended to 36 h. The established method has been further expanded for the applicability of forensic identification; and has a reference value for the detection of penicillin G residue in food. © 2010 Editorial Office of Chinese Journal of Chromatography, Dalian Institute of Chemical Physics, CAS. Source

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