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<p>Continuous monitoring of macronutrient levels is necessary for obtaining high-quality food products that meet human physiological needs for basic nutrients and energy. The accuracy of measurements performed during such monitoring is verified by an analysis of both test samples and reference materials for the composition of food products and raw food materials. The certified values of these reference materials shall be traceable to measurement standards and/or measurement results of national metrology institutes. For the calibration and measurement capabilities of national metrology institutes to be mutually recognized, it is necessary to obtain equivalent results of key comparisons. The possibility of organizing key comparisons is assessed during pilot comparisons. The article presents the results of the COOMET 880/RU-a/23 pilot comparison in the field of measuring the nutritional value of milk powder, which was conducted with the participation of national metrology institutes of the Russian Federation, the Republic of Belarus, the Kyrgyz Republic, and the People’s Republic of China. Certified reference materials for the composition of skim and whole milk powder were selected as the objects of comparison. The analyzed characteristics include the mass fractions of moisture, nitrogen, protein, fat, ash, and carbohydrates (lactose). Each participant in the comparison used the procedures, measuring instruments, and equipment that ensured the highest accuracy. When estimating the uncertainty in measuring the specified characteristics, the participants factored in the standard deviation of parallel determinations, the uncertainties of quantities included in measurement equations, and procedural factors. The comparison revealed consistency in most of the measurement results presented by the participants. Some deviating results of measuring method-defined measurands (mass fractions of ash and moisture) can be attributed to the empirical nature of the applied procedures, i.e., dependence between measurement results and drying or ashing conditions. For rational measurands (mass fraction of nitrogen), the discrepancies are probably due to incomplete extraction of the component from the test sample, as well as the lack of established traceability of the certified reference material used for titrant standardization. The comparison results will be used to prepare proposals for a&#xa0;key comparison for the purpose of mutual recognition of national measurement standards and of calibration and measurement certificates in the field of measuring the nutritional value of milk powder.</p>

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Results of the COOMET 880/RU-a/23 pilot comparison in the field of measuring the nutritional value of milk powder

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • Anna S. Sergeeva,
  • Olga S. Golynets,
  • Natalia V. Voshchula,
  • Aigul M. Aksupova,
  • Zhen Guo,
  • Bo Zhao,
  • Ling Shi,
  • Xia Zhou,
  • Guangliang Zhao,
  • Xiuqin Li

摘要

Continuous monitoring of macronutrient levels is necessary for obtaining high-quality food products that meet human physiological needs for basic nutrients and energy. The accuracy of measurements performed during such monitoring is verified by an analysis of both test samples and reference materials for the composition of food products and raw food materials. The certified values of these reference materials shall be traceable to measurement standards and/or measurement results of national metrology institutes. For the calibration and measurement capabilities of national metrology institutes to be mutually recognized, it is necessary to obtain equivalent results of key comparisons. The possibility of organizing key comparisons is assessed during pilot comparisons. The article presents the results of the COOMET 880/RU-a/23 pilot comparison in the field of measuring the nutritional value of milk powder, which was conducted with the participation of national metrology institutes of the Russian Federation, the Republic of Belarus, the Kyrgyz Republic, and the People’s Republic of China. Certified reference materials for the composition of skim and whole milk powder were selected as the objects of comparison. The analyzed characteristics include the mass fractions of moisture, nitrogen, protein, fat, ash, and carbohydrates (lactose). Each participant in the comparison used the procedures, measuring instruments, and equipment that ensured the highest accuracy. When estimating the uncertainty in measuring the specified characteristics, the participants factored in the standard deviation of parallel determinations, the uncertainties of quantities included in measurement equations, and procedural factors. The comparison revealed consistency in most of the measurement results presented by the participants. Some deviating results of measuring method-defined measurands (mass fractions of ash and moisture) can be attributed to the empirical nature of the applied procedures, i.e., dependence between measurement results and drying or ashing conditions. For rational measurands (mass fraction of nitrogen), the discrepancies are probably due to incomplete extraction of the component from the test sample, as well as the lack of established traceability of the certified reference material used for titrant standardization. The comparison results will be used to prepare proposals for a key comparison for the purpose of mutual recognition of national measurement standards and of calibration and measurement certificates in the field of measuring the nutritional value of milk powder.