高效液相色谱法测定乳粉中5种核苷酸的含量

High Performance Liquid Chromatography Determination of 5 Nucleotides in Milk Powder

建立乳粉中核苷酸高效液相色谱的测定方法。采用超纯水作为提取剂,0.5%的乙酸沉淀蛋白,SAX固相萃取小柱净化,C18色谱柱分离,流动相为0.1 mol/L的磷酸二氢钾溶液。每100 g乳粉中核苷酸添加量为0.3-50 mg时,回收率大于90%,定量限为0.3 mg/100 g。该方法具有结果准确、操作简便、重复性好等优点,可用于乳粉中核苷酸的检测。

A method for the determination of nucleotides in milk powder by high performance liquid chromatography （HPLC） was developed. Nucleotides were extracted with water, deproteinated with 0.5% acetic acid and cleaned up by an SAX solid phase extraction （SPE） column. The analysis was performed on C18 column using 0.1 mol/L phosphate as the mobile phase. The recoveries of spiked samples at three levels ranging from 0.3 to 50 mg/100 g were higher than 90%. The limit of quantification was 0.3 mg/100 g. This method was accurate, simple, reproducible, and suitable for the analysis of nucleotides in milk powder.