玉米淀粉基质乳粉中锡的检测

Determination of tin in milk powder containing corn starch matrix

中文关键词:  玉米淀粉  乳粉  基质效应  锡

英文关键词:corn starch  milk powder  matrix effect  tin

中文摘要:

      目的 建立检测含有玉米淀粉基质乳粉中锡的测试方法, 为此类乳粉中锡的检测提供依据。方法 选择基质含玉米淀粉的乳粉作为研究对象, 通过加标回收的方式, 结合不含玉米基质乳粉作为对比实验, 分别研究3种不同的样品制备流程。运用干法消化、湿法消化、酶解后湿法消化3种方法进行含玉米淀粉基质乳粉中锡的检测。结果 加标样品经干法消化, 回收率62.8%; 经湿法消化, 回收率0%; 经酶解后湿法消化, 回收率86.0%。酶解后湿法消化回收率结果, 显著优于干法消化和湿法消化的测试结果, 与不含由淀粉基质的乳粉加标测试回收率88.9%结果相当。结论 对于含有玉米淀粉基质的乳粉中锡的检测, 酶解后湿法消化的方式操作简单, 最为适用, 也说明引入淀粉酶能够保证锡测试结果的准确性。

英文摘要:

      Objective To establish a method for detection of tin in milk powder containing corn starch matrix, in order to set up a standard procedure for detection of tin in this kind of milk powder. Methods The milk powder containing corn starch was selected as the research object. Three different sample preparation processes were investigated by the method of spiked recovery, and the milk powder without corn matrix was used as comparison. Three different methods were respectively used for tin detection in milk powder containing corn starch matrix, including dry digestion, wet digestion, and wet digestion after enzymatic hydrolysis. Results The recoveries of dry digestion, wet digestion, and wet digestion after enzymatic hydrolysis were 62.8%, 0%, and 86.0%, respectively. It was easy to find that wet digestion after enzymatic hydrolysis was obviously better than dry digestion and simply wet digestion, which had the same recovery level with milk powder without corn starch matrix. Conclusion Wet digestion after enzymatic hydrolysis is simple and suitable for detection of tin in milk powder containing corn starch matrix The results also show that the introduction of amylase can ensure the accuracy of tin detection.