Sampling and sample preparation of pistachios

Thomas F. Schatzki; Natsuko Toyofuku

Sampling and sample preparation of pistachios

In: Meeting the mycotoxin menace

Authors:

Thomas F. Schatzki

Thomas F. Schatzki USDA-ARS Western Regional Research Center, Albany, CA 94710, USA tom@pw.usda.gov

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Natsuko Toyofuku

Natsuko Toyofuku USDA-ARS Western Regional Research Center, Albany, CA 94710, USA tom@pw.usda.gov

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Type:: Chapter

Pages:: 221–235

DOI:: https://doi.org/10.3920/978-90-8686-523-9_014

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A theory has been developed to quantify the reduction of sub-sample variance of aflatoxin contamination, which is observed when granular materials are wet slurried, rather than dry ground, during sub-sample homogenization. A coefficient of variation, based on particle size distribution, sub-sample size and probability of contamination, is predicted. The theory is tested with dry ground and with wet slurried pistachios and excellent quantitative agreement is obtained. A 32% increase in the mean aflatoxin level is observed as well when wet slurrying is applied. While no statistical explanation for this effect can be found, it is suggested that it is related to physio-chemical binding between the nut matrix and aflatoxin which is (partly) broken by wet slurrying, making the extraction of more toxin possible. Other parameters which may affect slurrying results have been investigated as well.

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Meeting the mycotoxin menace

E-Book ISBN:: 9789086865239

Publisher:: Wageningen Academic

Print Publication Date:: 10 Oct 2004

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- Life Sciences

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Sampling and sample preparation of pistachios

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Meeting the mycotoxin menace

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