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

Lyman, Geoffrey and Bourgeois, Florent and Gawalko, Eugene and Roscoe, Mike Estimation of the sampling constants for grains contaminated by mycotoxins and the impact on sampling precision. (2009) In: WCSB4, World Congress on Sampling and Blending, 21 October 2009 - 23 October 2009 (Cape Town, South Africa).

(Document in English)

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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.

Item Type:Conference or Workshop Item (Paper)
HAL Id:hal-04028542
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Materials sampling & consulting Pty Ltd (AUSTRALIA)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Canadian Grain Commission (CANADA)
Laboratory name:
Deposited On:10 Feb 2010 10:44

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