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Determination of Lipoic Acid in Biological Samples with Acetonitrile–Salt Stacking Method in CE

机译:乙腈盐堆积法测定生物样品中的硫辛酸

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An acetonitrile–salt stacking method was established for the assay of lipoic acid (LA) in biological samples. Samples were deproteinized with acetonitrile at a final concentration of 60 % (v/v) and then injected hydrodynamically at 3.45 × 103 Pa for 180.0 s. The optimum background electrolyte was found to be 90.0 mmol L-1 pH 9.1 borate buffer. LA could be detected within 35 min at ?7.0 kV with satisfactory repeatability (relative standard deviations, RSDs, of migration times and peak areas were both below 10 % for intraday and interday; n = 6/9) and a relatively low limit of detection of ca. 0.5 lmol L-1.
机译:建立了乙腈-盐堆积法测定生物样品中的硫辛酸(LA)。样品用乙腈脱蛋白,终浓度为60%(v / v),然后在3.45×103 Pa压力下动态注入180.0 s。发现最佳背景电解质为90.0 mmol L-1 pH 9.1硼酸盐缓冲液。可以在7.0 kV的电压下在35分钟内检测到LA,并具有令人满意的重复性(相对标准偏差,RSD,迁移时间和峰面积在日内和日间均低于10%; n = 6/9),并且检测限相对较低约。 0.5 lmol L-1。

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