Precision of the Pro-Milk method in routine determination of protein in dairy testing laboratories.

作者: R. GRAPPIN , V. S. PACKARD , R. E. GINN , MELLEMA

DOI: 10.4315/0362-028X-43.1.52

关键词: Kjeldahl methodChromatographyRepeatabilitySampling errorConfidence intervalReproducibilityMathematicsStandard deviationCalibration

摘要: In a collaborative study of the Pro-Milk Mark II dye-binding method for determining protein in milk, repeatability (r) was found to be 0.053% protein, and reproducibility (R) 0.215% at 95% confidence level. Standard deviations these two measures performance were 0.0188 0.0761, respectively. Repeatability influenced by sampling error, mis-readings, equipment routine control. Reproducibility same factors and, addition, accuracy calibration, with Kjeldahl as reference method. Results this indicate need centralize laboratory calibration calibrate over wide range levels.

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