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A proficiency test system to improve performance of milk analysis methods and produce reference values for component calibration samples for infrared.

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Presentation on theme: "A proficiency test system to improve performance of milk analysis methods and produce reference values for component calibration samples for infrared."— Presentation transcript:

1 A proficiency test system to improve performance of milk analysis methods and produce reference values for component calibration samples for infrared milk analysis1  Karen L. Wojciechowski, Caterina Melilli, David M. Barbano  Journal of Dairy Science  Volume 99, Issue 8, Pages (August 2016) DOI: /jds Copyright © 2016 American Dairy Science Association Terms and Conditions

2 Figure 1 Euclidean distance plot of ether extraction method (AOAC Method ; AOAC International, 2000) variation among laboratories in Software: Lab Compare V1.30, Cornell University, Ithaca, NY. RR=round robin; SDD=standard deviation of the difference. Color version available online. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

3 Figure 2 Euclidean distance plot of Kjeldahl true protein method variation (AOAC method ; AOAC International, 2000) among laboratories in Software: Lab Compare V1.30, Cornell University, Ithaca, NY. RR=round robin; SDD=standard deviation of the difference. Color version available online. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

4 Figure 3 Euclidean distance plot of enzymatic lactose method variation (AOAC method ; AOAC International, 2000) among laboratories in Software: Lab Compare V1.30, Cornell University, Ithaca, NY. RR=round robin; SDD=standard deviation of the difference. Color version available online. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

5 Figure 4 Euclidean distance plot of oven-drying TS method variation (AOAC method ; AOAC International, 2000) among laboratories in Software: Lab Compare V1.30, Cornell University, Ithaca, NY. RR=round robin; SDD=standard deviation of the difference. Color version available online. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

6 Figure 5 Pareto diagram of ether extraction performance (AOAC method ; AOAC International, 2000) among laboratories in Software: Lab Compare V1.30, Cornell University, Ithaca, NY. RR=round robin; SDD=standard deviation of the difference. Color version available online. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

7 Figure 6 Pareto diagram of Kjeldahl true protein method variation (AOAC method ; AOAC International, 2000) among laboratories in Software: Lab Compare V1.30, Cornell University, Ithaca, NY. RR=round robin; SDD=standard deviation of the difference. Color version available online. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

8 Figure 7 Pareto diagram of enzymatic lactose method variation (AOAC method ; AOAC International, 2000) among laboratories in Software: Lab Compare V1.30, Cornell University, Ithaca, NY. RR=round robin; SDD=standard deviation of the difference. Color version available online. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

9 Figure 8 Pareto diagram of oven-drying TS method variation (AOAC ; AOAC International, 2000) among laboratories in Software: Lab Compare V1.30, Cornell University, Ithaca, NY. RR=round robin; SDD=standard deviation of the difference. Color version available online. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

10 Figure 9 Residual plot of differences from the all-laboratory mean ether extraction (AOAC method ; AOAC International, 2000) result for laboratory 4, as a function of fat content of milk. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

11 Figure 10 Residual plot of differences from the all-laboratory mean ether extraction (AOAC method ; AOAC International, 2000) result for laboratory 10, as a function of fat content of milk. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

12 Figure 11 Residual plot of differences from the all-laboratory mean ether extraction (AOAC method ; AOAC International, 2000) result for laboratory 11, as a function of fat content of milk. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

13 Figure 12 Residual plot of differences from the all-laboratory mean Kjeldahl true protein (AOAC method ; AOAC International, 2000) result for laboratory 4, as a function of true protein content of milk. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

14 Figure 13 Residual plot of differences from the all-laboratory mean Kjeldahl true protein (AOAC method ; AOAC International, 2000) result for laboratory 2, as a function of true protein content of milk. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

15 Figure 14 Residual plot of differences from the all-laboratory mean Kjeldahl true protein (AOAC method ; AOAC International, 2000) result for laboratory 3, as a function of true protein content of milk. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

16 Figure 15 Residual plot of differences from the all-laboratory mean Kjeldahl true protein (AOAC method ; AOAC International, 2000) result for laboratory 7, as a function of true protein content of milk. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

17 Figure 16 Sensitivity analysis demonstrating the influence N HCl titrant concentration uncertainty on the residual difference from the all-laboratory mean in a laboratory proficiency test evaluation using 14 milks over a range of protein from 2 to 4.3% true protein for the Kjeldahl method (AOAC method ; AOAC International, 2000). Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

18 Figure 17 Residual plot of differences from the all-laboratory mean forced-air, oven-drying TS (AOAC method ; AOAC International, 2000) result for laboratory 1, as a function of TS content of milk. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

19 Figure 18 Residual plot of differences from the all-laboratory mean forced-air, oven-drying TS (AOAC method ; AOAC International, 2000) result for laboratory 10, as a function of TS content of milk. Journal of Dairy Science  , DOI: ( /jds ) Copyright © 2016 American Dairy Science Association Terms and Conditions

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