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高效液相色谱法对白酒中的L-乳酸和 D-乳酸的手性分离和测定

Liquor-Making Science & Technology(2019)

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Abstract
运用高效液相法和手性分离柱对白酒中的L-乳酸和D-乳酸进行分离和测定.白酒用超纯水稀释后,经0.22μm滤膜过滤后用配备二极管阵列检测器的高效液相系统检测,检测波长为254 nm.检测色谱柱为手性柱Chirex 3126(D)-penicillami(4.6 mm i.d×250 mm L,5μm),流动相为0.002 mol/L Cu-SO4溶液(溶剂为5%的异丙醇溶液).L-乳酸和D-乳酸的标准曲线在0.020~0.800 g/L范围线性良好,两者的线性相关系数都为0.999.白酒中L-乳酸和D-乳酸的回收率分别是98.47%~100.75%和100.10%~107.88%.该方法操作简便,精密度和准确度高,适用于白酒中L-乳酸和D-乳酸的测定.
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