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Validated hydrophilic interaction LC-MS/MS method for determination of 2-pyrrolidinone residue: applied to a depletion study of 2-pyrrolidinone in swine liver

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Abstract

A hydrophilic interaction high-performance liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) method for determination of 2-pyrrolidinone in swine liver was developed and validated. After the fortification of 2-pyrrolidinone-d6 as the internal standard, 2-pyrrolidinone in swine liver was extracted by acetonitrile, and the supernatant was led through a C18 + WAX mixed-mode solid phase extraction (SPE) cartridge. Furthermore, the eluate was adjusted to pH 5.0 and then led through a strong cationic exchange SPE cartridge. 2-Pyrrolidinone and 2-pyrrolidinone-d6 were concentrated and eluted by acetonitrile containing 2% ammonium hydroxide. The final eluate was acidified and then injected for hydrophilic interaction LC-MS/MS analysis. Mass spectrometry detection was carried using positive turbo-ion spray ionization mode. The multiple reaction monitoring transitions were 86 → 69 for 2-pyrrolidinone and 92 → 75 for 2-pyrrolidinone-d6. The C18 + WAX mixed-mode SPE cleanup greatly prevented the rapid contamination of mass spectrometer. The further SCX SPE cleanup thoroughly eliminated the absolute matrix effect. Solvent calibration standards could be readily used for quantitative analysis of 2-pyrrolidinone with excellent precision and accuracy. Endogenous levels of 2-pyrrolidinone in some blank matrices was readily determined. Full recoveries were readily achieved by the optimize extraction protocol, and thus the role of 2-pyrrolidinone-d6 was to just compensate the variation of the injections. The detection limit was 5 ng g−1 swine liver. The validated method was applied to a depletion study of 2-pyrrolidinone in swine liver following intramuscular administration of a drug 2-pyrrolidinone formulation. The matrix effect from tissue samples usually represented a technical challenge for LC-MS/MS analysis, and a very small molecule such as 2-pyrrolidinone also represented a technical barrier for LC-MS/MS analysis. However, the extraction protocol developed in the present study reached the best outcome: zero matrix effect and full recovery.

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Authors and Affiliations

  1. State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, China

    Yanhong Liu, Ximing Chen, Yanhong Ji, Jiangtao Chen, Guangxiang Wang, Youjun Shang & Xiangtao Liu

  2. Chrom-Matrix Inc, 2455 George Washington Way, Suite M271, Richland, WA, 99354, USA

    Jack Pan

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  1. Yanhong Liu
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  2. Ximing Chen
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Liu, Y., Chen, X., Ji, Y. et al. Validated hydrophilic interaction LC-MS/MS method for determination of 2-pyrrolidinone residue: applied to a depletion study of 2-pyrrolidinone in swine liver. Anal Bioanal Chem 399, 1371–1380 (2011). https://doi.org/10.1007/s00216-010-4395-z

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  • DOI: https://doi.org/10.1007/s00216-010-4395-z

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