研究了不同取样方法对婴幼儿配方乳粉中7种营养元素测定结果的影响。选用几种国内外婴幼儿配方乳粉,采用直接取样和根据食用说明冲调后取样2种不同方式,通过微波消解-电感耦合等离子体发射光谱法对钾、钙、钠、镁、铁、铜、锌7中营养元素进行测定。实验结果显示,在直接取样方式进行的随机部位、上部位、中部位、下部位取样,同一检测项目测定结果波动范围较大,且有少数测定值偏离正常参考值范围;同时,冲调后取样的测定结果精密度良好。研究结果表明,测定婴幼儿配方乳粉营养元素时,建议按照产品包装说明的食用方法进行冲调后,再按比例取样进行检测,可降低因取样代表性不足而引起的检测误差。
The effect of two different methods of direct sampling and sampling according to the preparing instructions on determining seven nutrients in infant formula. Microwave digestion inductively coupled plasma emission spectrometry was used. The content of each element fluctuated greatly in direct sampling from random, upper, middle and lower positions, with a few indexes exceeded the reference value; the precision of testing results was good using the recommended preparing method. The results suggested that the test of mineral elements in infant formula should be carried out after preparing according to the product labeling. Then the detection error caused by the lack of representative sampling could be reduced to the minimum.
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