Determination of Cortisol in Human Serum Using Ultrasonic Extraction Coupled with Liquid Chromatography-Isotope Dilution Mass Spectrometry

文献类型： 外文期刊

第一作者： Zhou Jian

作者： Zhou Jian;Wang Min;Tang Xiao-Yan;Mao Xue-Fei;Dai Xin-Hua

作者机构：

关键词： Cortisol;Isotope dilution;Liquid chromatography-mass spectrometry;Ultrasonic extraction;Serum

期刊名称：CHINESE JOURNAL OF ANALYTICAL CHEMISTRY （ 影响因子：1.134； 五年影响因子：0.909 ）

ISSN： 0253-3820

年卷期： 2013 年 41 卷 9 期

页码：

收录情况： SCI

摘要： A liquid chromatography. tandem mass spectrometric (LC-MS/MS) method was developed for the determination of cortisol in human serum. Serum was spiked with corisol-d4 as internal standard and then equilibrated for 30 min. Acetonitrile was employed for deproteinization and the mixture was extracted by ultrasonication for 10 min followed by centrifugation at 3000 r/min for 15 min. The supernatant fluids were evaporated to dryness with nitrogen flow and redissolved in water and subsequently extracted with ethyl acetate for twice. The extracts were evaporated with nitrogen flow and redissolved in 200 mu L mobile phase. Chromatographic separation was performed on Zorbax Eclipse Plus C-18 column with the mobile phase consisted of methanol and water containing 0. 1% formic acid (43 : 57, V/V). Good precision was achieved with inter. day relative standard deviations (RSDs) of 0. 3%-0. 7% and intra. day CVs of 0. 3%-0. 6%. The recoveries of spiked samples ranged from 99. 6% to 101. 0%, limit of quantitation was 1. 68 mu g/kg. This method was applied to the determination of three kinds of human serum cortisol and the stability of cortisol in serum was also studied.

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