Abstract
Abstract A liquid chromatographic method employing an in-series dual mercury/gold amalgam electrochemical detector has been developed for measurement of the symmetrical disulfide metabolite WR33278 [NH2(CH2) 3NHCH2CH2S-]2 of the radioprotector WR2721 in blood, tissues and biological fluids such as urine. The problem of adsorption of this disulfide to the octylsilane reverse phase column was overcome by including 10.7 mmol/L ethylamine in the mobile phase. The retention times for WR33278 and WR183159 [CH3NH (CH2) 3NHCH2CH2S-]2, the internal standard, are approximately 3.9 and 11 minutes, respectively. Linearity of the method was to 1000 umol/L. This method has good precision and accuracy and has a sensitivity limit of 0.2 umol/L. Investigation of the metabolism and pharmacokinetics of WR33278 in patients and experimental animal models, after administration of WR2721, using the described chromatographic conditions is currently underway.
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