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In this work, a rapid, simple, sensitive and specific LC-MS/MS method was developed and validated for the quantification of S-Allylmercaptocysteine (SAMC) in plasma. After a simple sample procedure by one step protein precipitation with acetontrile, the samples were separated on Gemini-NX C18 column (2.1 mm i.d. 150 mm, 3 μm, Phenomenex). The mobile phase was composed of water-acetonitrile (20:80, v/v) at an isocratic flow rate of 0.3 mL/min. The developed method was validated based on the International Conference on Harmonization (ICH) guidelines. The results show that the method had satisfactory specificity, precision and accuracy in a linear range of 50-3,000 ng/mL for SAMC. The precision conformed to the acceptance criteria, and the lower limit of quantification was 50 ng/mL for the analyte. The plasma samples stored for 10 days or after two freeze-thaw cycles (-80°C) were stable. This method was successfully applied to a pharmacokinetics study of SAMC in rats. It was found that SAMC metabolized very quickly in rats and its plasma half-life was less than 5 min.

Determination of S-Allylmercaptocysteine in Rat Plasma by LC–MS/MS and its Application to a Pharmacokinetics Study