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首页> 外文期刊>Analytical and bioanalytical chemistry >Reference materials to evaluate measurement systems for the nutrient composition of foods: results from USDA's National Food and Nutrient Analysis Program (NFNAP)
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Reference materials to evaluate measurement systems for the nutrient composition of foods: results from USDA's National Food and Nutrient Analysis Program (NFNAP)

机译：评估食品营养成分测量系统的参考材料：美国农业部国家食品和营养分析计划（NFNAP）的结果

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摘要

Over a 6.5-year period a total of 2554 values were reported by nine laboratories for 259 certified or reference nutrient concentrations in 26 certified reference materials (CRM) submitted to contract laboratories, blinded, as part of the qualifying process for analytical contracts and in the routine sample stream as part of the National Food and Nutrient Analysis Program. Each value was converted to a Z'-score, reflecting the difference from the assigned value related to the combined expected analytical uncertainty plus the uncertainty in the CRM value. Z'-scores >|3.0| were considered unacceptable. For some nutrients (Na, folate, dietary fiber, pantothenic acid, thiamin, tocopherols, carotenoids, monounsaturated, and polyunsaturated fatty acids), > 20% of Z'-scores were >|3.0|. For total fat, vitamin C, and niacin > 25% of Z'-scores were >|2.0|. Components for which CRM data were best (more than 90% of Z'-scores <|2.0|) were Mg, P, Mn, Se, and vitamin B12. In some cases deviations from assigned values were not uniform across laboratories and materials. For Na almost all high Z'-scores were for low-Na matrices, suggesting analytical problems related to concentration.
机译：在6.5年的时间里，作为分析合同资格流程的一部分，九个实验室报告了向合同实验室提交的26种认证参考物质（CRM）中的259种认证或参考营养素浓度的2554个值。常规样品流作为国家食品和营养分析计划的一部分。每个值都转换为Z'分数，反映出与分配的值相关的差异，该值与组合的预期分析不确定性以及CRM值的不确定性有关。 Z'得分> | 3.0 |被认为是不可接受的。对于某些营养素（钠，叶酸，膳食纤维，泛酸，硫胺素，生育酚，类胡萝卜素，单不饱和脂肪酸和多不饱和脂肪酸），Z'得分的> 20％为> | 3.0 |。对于总脂肪，维生素C和烟酸，> 25％的Z'得分> 2.0。 CRM数据最好的成分（超过90％的Z'分数<| 2.0 |）是Mg，P，Mn，Se和维生素B12。在某些情况下，实验室和材料之间与指定值的偏差不一致。对于Na，几乎所有的高Z'分数都用于低Na的基质，这提示了与浓度有关的分析问题。

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