高效液相色谱法测定新西兰兔血浆中硫辛酸浓度

目的 建立高效液相色谱法测定新西兰兔血浆中硫辛酸的浓度.方法 新西兰兔采血后离心得血浆经酶水解化后,用Bakerphenyl固相萃取小柱提取血浆中硫辛酸,采用HPLC法紫外检测器检测.色谱柱为HYPERSIL BDS C18柱(250 mm×4.6 mm,5 μm),流动相为磷酸二氢钾∶乙腈(50∶50,v/v),流速1.0 ml/min,检测波长230 nm.结果 测定方法在硫辛酸浓度为5～100 μg/L范围内具有良好线性关系,萃取回收率在77.4%～82.1%之间.日内、日间RSD在1.5%～8.9%之间.新西兰兔单剂量口服硫辛酸片300 mg0.5 h后测定血浆中硫辛酸浓度为11.08±1.79 μg/L.结论 本测定方法适用于口服硫辛酸的动物体内硫辛酸含量测定研究.

High-performance liquid chromatography for determining plasma alpha-lipoic acid in New Zealand rabbits

OBJECTIVE: To establish a method for determining the content of alpha-lipoic acid in New Zealand rabbit plasma. METHODS: Alpha-lipoic acid in the plasma samples was purified by solid-phase extractor and analyzed on an HYPERSIL C18 column with isocratic mobile phase consisting of potassium dihydrogen phosphate-acetonitrile (50:50, v/v) at a flow rate of 1.0 ml/min and detection wavelength of 230 nm. RESULTS: The standard curve was linear in the range of 5-100 microg/L (r=1) and the average recovery was 77.4%-82.1%. The relative standard deviations of intra-day and inter-day assay were within 1.5%-8.9%. CONCLUSION: The method is sensitive, accurate and simple for determining plasma alpha-lipoic acid levels in New Zealand rabbits.