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Background AOAC Method 2013.07 was adopted as First Action in 2013. Since then, the method has been used in numerous residue depletion studies with favorable comments from analysts. Objective To analyze data from residue depletion studies to support Final Action status. Method Ten residue depletion studies were conducted during May 2014 through May 2019. For each study, harvested incurred tissues were analyzed for nicarbazin using AOAC Method 2013.07 in 1 of 4 laboratories. Each analytical run included one or more fortified quality control test portions. The data from these known fortified matrix test portions were analyzed for reproducibility and repeatability. Results For muscle tissues, relative recovery was 90.4% (95% CI 83.8 to 97.5); RSDr was 5.4% (95% CI 3.8 to 9.2); and RSDR was 7.9%. In the liver, values were 94.5% (95% CI 91.1 to 98.0), 5.8% (95% CI 4.1 to 9.9), and 6.8%, respectively. In the kidney, values were 91.5% (95% CI 85.3 to 98.1), 5.2% (95% CI 3.7 to 8.8), and 9.0%, respectively. In skin with adhering fat, values were 94.5% (95% CI 89.2 to 100.1), 8.9% (95% CI 6.3 to 15.1), and 8.9%, respectively. In all cases, repeatability and reproducibility were within acceptable limits. Conclusions The data and positive feedback support the transition of AOAC Method 2013.07 from First Action to Final Action. Highlights Final action status is supported by data collected during routine use of the method rather than a traditional multi-laboratory collaborative study. Data were subjected to statistical analysis using the pC-metamer, and then transformed back to the traditional C-metamer.

journal of aoac international

Determination and Identification of Nicarbazin, Measured as 4,4′-Dinitrocarbanilide (DNC), in Chicken Tissues by Liquid Chromatography With Tandem Mass Spectrometry: Final Action 2013.07