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United States Department of Agriculture

Agricultural Research Service

Title: Performance of Sampling Plans to Detect Aflatoxin in Farmers' Stock Peanut Lots by Measuring Aflatoxin in High Risk Grade Components

item Whitaker, Thomas
item Hagler, Winston - NCSU
item Giesbrecht, Francis - NCSU

Submitted to: American Peanut Research and Education Society Proceedings
Publication Type: Proceedings
Publication Acceptance Date: July 10, 1998
Publication Date: N/A

Technical Abstract: Five, 2-kg test samples were taken from each of 120 farmers' stock peanut lots contaminated with aflatoxin. Kernels from each 2-kg sample were divided into the following USDA grade components: sound mature kernels plus sound splits (SMKSS), other kernels (OK), loose shelled kernels (LSK), and damaged kernels (DAM). The kernel mass (g), aflatoxin mass (nanogram or ng), and aflatoxin concentration (ng of aflatoxin/g of peanuts) were measured for each of the 2,400 component samples. The variability associated with measuring aflatoxin mass (ng) in OK+LSK+DAM [A(OLD)ng], aflatoxin mass (ng) in LSK+DAM [A(LD)ng], aflatoxin concentration (ng/g) in OK+LSK+DAM [A(OLD)ng/g], and aflatoxin concentration (ng/g) in LSK+DAM [A(LD)ng/g] was determined. The variance associated with measuring aflatoxin in each of the four combinations of components increased with aflatoxin and functional relationships were developed from regression analy yanalysis. The coefficient of variation (CV) associated with estimating th aflatoxin for a lot with 100 ng/g was 90, 86, 96, and 98% when measuring aflatoxin mass in A(OLD) ng and A(LD)ng, and aflatoxin concentration in A(OLD)ng/g and A(LD)ng, respectively. The performance of aflatoxin sampling plans using the combination of A(OLD)ng and A(LD)ng components was evaluated using a 2-kg test sample and a 50 ng/g accept/reject limit.

Last Modified: 4/22/2015
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