Abstract
A two-dimensional ion chromatography system was developed for the determination of γ-hydroxybutyrate (GHB) in human urine samples. Ion exclusion chromatography was used in the first dimensional separation for elimination of urine matrices and detection of GHB above 10mgL−1, ion exchange chromatography was used in the second dimensional separation via column-switching technique for detection of GHB above 0.08mgL−1. Under the optimized chromatographic conditions, the ion exclusion and ion exchange chromatography separation system exhibited satisfactory repeatability (RSD<3.1%, n=6) and good linearity in the range of 50–1000mgL−1 and 0.5–100mgL−1, respectively. By this method, concentrations of GHB in the selected human urine samples were detected in the range of 0–1.57mgL−1. The urine sample containing 0.89mgL−1 GHB was selected to evaluate the accuracy; the spiked recoveries of GHB were 95.9-102.8%. The results showed that the two-dimensional ion chromatography system was convenient and practical for the determination of GHB in human urine samples.
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