4. AOACRIMicroMethods-2018Awards

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B ird et al .: J ournal of AOAC I nternational V ol . 99, N o . 3, 2016  671

Figure 2. Youden plots for 3M Petrifilm RAC Plate and FDA BAM results for raw easy-peel shrimp evaluated at 35°C.

interlaboratory data analyses are presented in Tables 2015.13A and 2015.13B .

by the Cochran’s tests for outliers. However, no evidence of physical cause or suspicion of cause was noted and it was determined that the data would be included in the statistical analysis. There were no statistically significant differences between the 3M Petrifilm RAC Plate and FDABAM methods as determined by the 95% CI of the differences of means at any of the three contamination levels.

Raw Easy-Peel Shrimp

Raw easy-peel shrimp test portions were evaluated at a low, medium, and high contamination level for the presence of naturally occurring aerobic bacteria. Replicate 3M Petrifilm RAC Plates were evaluated at both 32 and 35°C (Tables 2015.13D and  E ) Sixteen laboratories participated in the analysis of this matrix, with all 16 laboratories submitting data.

3M Petrifilm RAC Plate Incubated at 35°C

For the 3M Petrifilm RAC Plate medium contamination level and for the FDA BAM low and high contamination levels, one outlier laboratory was identified by the Cochran’s tests for outliers. However, no evidence of physical cause or suspicion of cause was noted and it was determined that the data would be included in the statistical analysis.

3M Petrifilm RAC Plate Incubated at 32°C

For the 3M Petrifilm RAC Plate low and medium contamination levels and for the FDA BAM low and high contamination levels, one outlier laboratory was identified

Figure 3. Youden plots for 3M Petrifilm RAC Plate and SMEDP results for pasteurized skim milk.

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