乳粉中烟酸和烟酰胺含量测定能力验证结果与分析

Results and analysis of proficiency testing for the determination of nicotinic acid and nicotinamide content in milk powder

中文关键词:  能力验证  乳粉  烟酸  烟酰胺

英文关键词:proficiency testing  milk powder  nicotinic acid  nicotinamide

中文摘要:

      目的 设计组织乳粉中烟酸、烟酰胺含量测定能力验证项目, 评价实验室检测配方乳粉中烟酸、烟酰胺的技术能力和水平。方法 考核样品中的烟酸、烟酰胺在P＜0.05显著水平时是否均匀, 且在整个计划周期内稳定、满足能力验证的要求。通过实施本次能力验证计划, 采用Z比分法对来自20个省(自治区)、直辖市的49家实验室的测定结果和检测能力进行评价。结果 在参加实验室中, 烟酸、烟酰胺初测满意率为91.8%, 补测后总体满意率为100%。结论 所有参加实验室检测能力结果满意, 表明乳粉中烟酸、烟酰胺检测水平总体良好。对离群结果进行技术分析, 可以帮助实验室查找原因并进行整改。

英文摘要:

      Objective To design a proficiency test project for organizing the determination of niacin and nicotinamide in milk powder, and to evaluate the laboratory's technical ability and level to detect niacin and nicotinamide in formula milk powder. Methods The uniform at the significant level of P<0.05 and the stablity in the whole planning period of the amount of nicotinic acid and nicotinamide, meeting the requirement of capability verification in the samples were investigated. Through the implementation of the capability verification plan, the measurement results and testing capability of 49 laboratories from 20 provinces (autonomous regions) and municipalities directly under the central government were evaluated the Z-score method. Results In all of the laboratories participated in the determination of nicotinic acid and nicotinamide, the first satisfactory rate was 91.8%, while the total satisfactory rate was 100 % after the last testing. Conclusion All the participant laboratories pass the test with satisfactory results, indicating that the determination of nicotinic acid and nicotinamide in milk powder shows an overall good level. Analyzing the outlier results can help laboratories find the reasons and carry out rectification.