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Conference Papers Year : 2009

Estimation of the sampling constants for grains contaminated by mycotoxins and the impact on sampling precision

Abstract

Grains are subject to contamination by mycotoxins which are metabolic by-products of various fungi. The fungal infestations produce local concentrations of the mycotoxins thousands of times higher than the average. These facts make the sampling of the grain for assessment of the mean mycotoxin levels potentially very difficult. In the context of sampling theory, this morphology of the infestations creates a very high distributional and intrinsic heterogeneity of the grain shipment. The distributions of mycotoxin concentrations in seaborne shipments that exist at loading and the number and intensity of infestations that develop under shipping conditions are unknown. All grain shipments carry spores that may give rise to mycotoxin-producing colonies; moisture and temperature determine the final extent of the problem. This paper develops the value of the sampling constant with respect to intrinsic heterogeneity based on data on observed Ochratoxin A (OTA) concentrations in individual wheat kernels. A useful relationship between the distribution of mycotoxin concentrations on a kernel to kernel basis and the distribution of concentration over subsamples is developed.
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Dates and versions

hal-04028542 , version 1 (14-03-2023)

Identifiers

  • HAL Id : hal-04028542 , version 1
  • OATAO : 3266

Cite

Geoffrey Lyman, Florent Bourgeois, Eugene Gawalko, Mike Roscoe. Estimation of the sampling constants for grains contaminated by mycotoxins and the impact on sampling precision. WCSB4, World Congress on Sampling and Blending, Oct 2009, Le Cap, South Africa. pp.19-24. ⟨hal-04028542⟩
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