微生物法测定婴幼儿乳粉中烟酸含量
目的 建立微生物法测定婴幼儿乳粉中烟酸含量的分析方法。方法 通过比较不同浓度标准曲线对同一标准物质样品的测定结果, 确定准确最优的线性浓度范围, 并在该标准范围内进行重复性及加标回收实验。结果 当烟酸标曲线性浓度范围为5.0~50.0 ng时, 线性关系良好(r2=0.996)。该方法的相对标准偏差(relative standard deviation, RSD)为1.71%(n=6), 平均回收率为94.4%。结论 该方法稳定准确, 适合用于测定婴幼儿乳粉中烟酸的含量。
Objective To establish a method for the determination of niacin in infant milk powder by microbiological method. Methods By comparing the measurement results of the same standard substance sample with different concentration standard curves, the accurate and optimal linear concentration range was determined, and the repeatability and spike recovery test were carried out within the standard range. Results When the nicotinic acid standard concentration range was 5.0-50.0 ng, the linear relationship was good (r2=0.996). The relative standard deviation (RSD) of the method was 1.71% (n=6), and the average recovery was 94.4%. Conclusion The method is stable and accurate, which is suitable for determining the content of niacin in infant milk powder.
标题：微生物法测定婴幼儿乳粉中烟酸含量
英文标题：Determination of niacin in infant milk powder by microbiological method
作者：
顾晨荣 上海市质量监督检验技术研究院/国家食品质量监督检验中心
徐琼 上海市质量监督检验技术研究院/国家食品质量监督检验中心
庞贝妮 上海市质量监督检验技术研究院/国家食品质量监督检验中心
王志伟 上海市质量监督检验技术研究院/国家食品质量监督检验中心
曲勤凤 上海市质量监督检验技术研究院/国家食品质量监督检验中心
中文关键词:烟酸,微生物法,婴幼儿乳粉,
英文关键词:niacin,microbiological method,infant milk powder,
发表日期：2019-01-22
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