Deuterium-labeled ursodeoxycholic acid (UDCA-d2) was synthesized from cholic acid by heterogeneous catalytic reduction of the 11, 12-unsaturated bile acid with deuterium gas. A new method for the simultaneous determination of UDCA, UDCA-d2, related bile acids and cholesterol in human bile has been developed by gas chromatography-mass fragmentography of the methyl ester trimethylsilyl ether derivatives. The glycine conjugate of 5β-chol-3-en-24-oic acid was prepared from lithocholic acid and used as an internal standard. Calibration plots gave a good linear relationship over the range of 100-500 ng of each compound, and their recoveries (95-99%) relative to the internal standard suggested that the present method is sufficiently accurate for the practical analysis of these bile acids in human bile. The method was applied to investigate the fate of UDCA-d2 orally administered to a patient with complete bile fistula.
氘标记的
熊去氧胆酸(UDCA-d2)是通过
氘气对11,12-不饱和
胆酸的异相催化还原从
胆酸合成的。我们开发了一种通过气相色谱-质谱碎片分析法同时测定人胆汁中的UDCA、UDCA-d2、相关
胆酸和
胆固醇的新方法。以5β-
胆-3-烯-24-酸的甘
氨酸结合物为内标,采用自
胆酸制备。标定曲线在每种化合物100-500 ng范围内显示出良好的线性关系,并且相对于内标的回收率(95-99%)表明该方法在实际分析人胆汁中的
胆酸方面具有足够的准确性。该方法已应用于研究口服给药的UDCA-d2在完全胆漏患者体内的命运。