Variability Associated with Testing Shelled Corn for Fumonisin

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Abstract

Variances associated with sampling, sample preparation, and analytical steps of a test procedure that measures fumonisin in shelled corn were estimated. The variance associated with each step of the test procedure increases with fumonisin concentration. Functional relationships between variance and fumonisin concentration were estimated by regression analysis. For each variance component, functional relationships were independent of fumonisin type (total, B1, B2, and B3 fumonisins). At 2 ppm, coefficients of variation associated with sampling (1.1 kg sample), sample preparation (Romer mill and 25 g subsample), and analysis are 16.6, 9.1, and 9.7%, respectively. The coefficient of variation associated with the total fumonisin test procedure was 45% and is about the same order of magnitude as that for measuring aflatoxin in shelled corn with a similar test procedure.

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Whitaker, T. B., Trucksess, M. W., Johansson, A. S., Giesbrecht, F. G., Hagler, W. M., & Bowman, D. T. (1998). Variability Associated with Testing Shelled Corn for Fumonisin. Journal of AOAC International, 81(6), 1162–1168. https://doi.org/10.1093/jaoac/81.6.1162

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