Abstract: A method for the determination of zeaxanthin in milk powder was developed using high performance liquid chromatography (HPLC). The sample was saponified with potassium hydroxide solution to release zeaxanthin, extracted with a mixed solvent of ethyl ether, n-hexane and cyclohexane and frozen for degreasing. The chromatographic separation was performed on a C30 column with gradient elution. The analyte was detected with an ultraviolet detector and quantified by an external standard method. The limit of quantification was 100 μg/100 g and the limit of detection was 30 μg/100 g for zeaxanthin in milk powder. The method recoveries at spiked concentration levels of 90–811 μg/100 g were 85.8%–102.2%, with relative standard deviations ranging from 1.43% to 2.76%. This method was accurate, repeatable, precise and sensitive.

Key words: zeaxanthin, high performance liquid chromatography, saponification, milk powder

摘要： 建立乳粉中玉米黄质含量的高效液相色谱测定方法。室温条件下，乳粉样品经氢氧化钾溶液皂化，使玉米黄质游离，再以乙醚-正己烷-环己烷混合溶剂提取，冷冻脱脂，采用梯度洗脱程序进行洗脱，C30色谱柱分离，紫外检测器检测，外标法定量。结果表明：乳粉中玉米黄质的检出限为30 μg/100 g，定量限为100 μg/100 g；当乳粉中玉米黄质加标量为90～811 μg/100 g时，加标回收率为85.8%～102.2%，相对标准偏差为1.43%～2.76%。该方法具有较好的准确度、精密度和重复性，灵敏度较高。

关键词: 玉米黄质, 高效液相色谱, 皂化, 乳粉