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Precision of the Pro-Milk Method in Routine Determination of Protein in Dairy Testing Laboratories 1
Abstract:
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% protein at the 95% confidence level. Standard deviations of these two measures of performance were 0.0188 and 0.0761, respectively. Repeatability was influenced by sampling error, mis-readings, equipment performance and routine control. Reproducibility was influenced by the same factors and, in addition, accuracy of calibration, with Kjeldahl as the reference method. Results of this study indicate the need to centralize laboratory calibration and to calibrate equipment over a wide range of protein levels.
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