在线渗析-离子色谱法直接测定奶粉中胆碱

Direct determination of choline in milk powder for infant and young children by online dialysis-ion chromography

目的：建立在线渗析-离子色谱直接进样测定奶粉中胆碱的方法。方法：奶粉溶解后，直接在线渗析-离子色谱测定。结果：渗析效率99.0%-102.1%。胆碱的含量0.165%，加标回收率103.4%。相对标准偏差1.6%（n=6）。结论：该方法准确、快速、简便、重现性好、自动化高。

Objective：The method for determination of the choline in milk powder by online dialysis ion chromatography is established. Methods：Milk powder was dissolved in pure water, and then directly determined by online dialysis - IC. Results：The dialysis recovery was 99. 0% - 102. 1%. The content of choline in milk power was 0. 165% and the recovery rate was 103.4%. The RSD of each anion was 1.6% （n = 6 ）. Conclusion：This method is accurate, quick, simple, reproducible and highly automatic.