Abstract
A simple and novel LC method has been developed for determination of isepamicin (ISP) in rat plasma, an aminoglycoside antibiotic agent. After protein precipitation and clean-up procedure to remove lipophilic contaminants, ISP is derivatized by pre-column with 9-fluorenylmethyl chloroformate for fluorescence detection. Chromatographic separations are achieved using a C18 column and mobile phase consisting of water and acetonitrile (68/32, v/v). Amikacin was used as an internal standard. The calibration curve was linear over a concentration range of 0.625–15 μg mL−1. The limit of quantification was 0.45 μg mL−1. The intra- and inter-day variabilities of ISP were both less than 5%. Both derivatives were stable for at least a week at ambient condition. This assay procedure should have useful application in therapeutic drug monitoring of ISP. The limit of detection was 0.10 μg mL−1. The specificity, assay linearity, low level assay linearity and assay repeatability were also investigated. The established method provides a reliable bioanalytical method to carry out isepamicin pharmacokinetics in rat plasma.
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Acknowledgments
This project is supported by the Chongqing Municipal Key Laboratory on Luminescence and Real-Time Analysis, Southwest University (no. CSTC2006CA 8006). All authors here express their deep thanks.
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Chang, X., Peng, J. LC Analysis of Isepamicin in Plasma Samples Post-Inhalation with Fluorescence Detection and Its Application to a Pharmacokinetic Study. Chroma 70, 1429–1433 (2009). https://doi.org/10.1365/s10337-009-1331-5
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DOI: https://doi.org/10.1365/s10337-009-1331-5