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Determination of 2,3-dimercaptosuccinic acid in mice blood and tissues by HPLC with fluorescence detection.
Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences 2009 June 2
2,3-Dimercaptosuccinic acid (DMSA) is an orally effective chelating agent for the treatment of heavy metal poisoning. The increasing therapeutic use of DMSA has stimulated the need for sensitive and selective methods for its determination in biological samples, as well as study on pharmacokinetics and tissue distribution. According to the previously reported method, an improved method was established for the determination of DMSA in mice blood and tissues, in which oxidized DMSA was reduced by the disulfide-reducing agent, dithiothreitol (DTT), and DMSA was converted to a highly fluorescent and stable derivative by reaction with monobromobimane (mBBr) in alkaline solution. Acetonitrile was used for deproteinization and dichloromethane was used for condensation and purification, which significantly shortened the amount of time used to process the sample. Meanwhile isocratical elution was performed and excellent separation of the DMSA derivative was obtained, this enabled a run finish within 20 min. The limits of quantitation were 0.025 microg/ml in brain and 0.1 microg/ml in blood, lung, heart, intestine, liver, spleen and kidney, respectively. The calibration curves were linear in all samples (r(2)>0.992) with a range of 0.025-1.6 microg/ml for brain homogenate and 0.1-6.4 microg/ml for blood and homogenates of lung, heart, intestine, liver, spleen and kidney, respectively. Therefore, the method is simple, rapid and sensitive, and it could be applicable to the studies in an animal model to evaluate the distribution of DMSA in blood and tissues.
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