Aim To develop and validate a liquid chromatographic/tandem mass spectrometric (LC/MS/MS) method for the simultaneous quantitation of pseudoephedrine and diphenhydramine in human plasma after oral administration of compound preparation. Methods Samples spiked with the analytes and the internal standard, chlorphenamine, were processed using liquid-liquid extraction. The extract was chromatographed on a Diamonsil C 18 column. The mobile phase consisted of methanol-water-formic acid (70∶30∶1), at a flow rate of 0.65 mL·min -1 . A Finnigan TSQ tandem mass spectrometer equipped with atmospheric pressure chemical ionization source was used as detector and was operated in the positive ion mode. Selected reaction monitoring (SRM) using the precursor/product ion combinations of m/z 166→148 and m/z 256→167 were used to quantify pseudoephedrine and diphenhydramine, respectively. Results The linear concentration ranges of the calibration curves for pseudoephedrine and diphenhydramine were both 2.0-400.0 μg·L -1 . The lower limit of quantification of both analytes was 2.0 ng·mL -1 . Each sample was chromatographed within 3.9 min. Conclusion The method was successfully used in simultaneous determination of pseudoephedrine and diphenhydramine in human plasma after oral administration of a compound preparation containing 60 mg pseudoephedrine chloride and 50 mg diphenhydramine chloride. The method was shown to be suitable for clinical investigation of pseudoephedrine and diphenhydramine pharmacokinetics.
目的:建立LC/MS/MS法测定人血浆中非那雄胺的浓度,并研究其在中国男性健康人体内的药代动力学。方法:采用LC/MS/MS(APCI源)测定非那雄胺的血浆浓度,并计算其药代动力学参数。结果:非那雄胺线性范围为0.2～50.0μg·L^(-1),定量下限为0.2μg·L^(-1)。日内、日间精密度(RSD)均小于10%,准确度(PE)在±3％内。应用本法测得18名中国男性健康志愿者口服5mg非那雄胺片后主要药代动力学参数为:t_(1/2ke)为5.57±1.60h,K_e为0.12±0.06H^(-1),t_(max)为2.31±0.82h,C_(max)为4O.31±10.89μg L^(-1);AUC_(0-t)和AUC(0-∞)分别为267.9±75.0μg h L^(-1)和286.6±88.6μghL^(-1)。结论:该法操作简便、快速、灵敏,可用于测定血浆中非那雄胺浓度。
