A fast and accurate micellar electrokinetic capillary chromatography (MEKC) method was developed for monitoring N-methyl-2-pyrrolidone (NMP) exposure. Baseline separation of NMP and its main metabolites: 5-hydroxy-N-methyl-2-pyrrolidone (5HNMP), N-methylsuccinimide (MSI), 2-hydroxy-N-methylsuccinimide (2HMSI), and 2-pyrrolidone (2P) was obtained within 6 min in an uncoated fused silica capillary using 5 mM phosphate buffer and 140 mM sodium dodecyl sulfate (pH 7.1) as background electrolyte (BGE). On-line UV-detection was performed at 200 nm and the applied electric field was 400 V cm−1. Possible interference of BGE-induced system peaks on separation was investigated by computer simulation and no such interference was observed. The developed MEKC method combined with solid phase extraction for sample preparation was successfully applied to the analysis of urine of rats exposed to NMP. The urinary excretion was determined in 0–6 h and 6–24 h specimens collected after an intragastic administration of 308 mg NMP / kg rat body weight. The results of NMP disposition kinetics in rat urine are reported for NMP and metabolites. <alternatives> [...] </alternatives>
 ACGIH, N-Methyl-2-pyrrolidone BEI®, 2010 TLVs® and BEIs® with 7th Edition Documentation (The American Conference of Governmental Industrial Hygienists, Cincinnati, Ohio, 2010)
 IPCS, Concise International Chemical Assessment Document No. 35, N-Methyl-2-Pyrrolidone. Inter-Organization Programme for the Sound Management of Chemicals (IOMC) (World Health Organization, Geneva, 2001)
 SCOEL, Recommendation of the Scientific Committee on Occupational Exposure Limits for N-methylpyrrolidone (Scientific Committee on Occupational Exposure Limits, Brussels, 2007)
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