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Food Additives & Contaminants: Part B
Surveillance
Volume 5, 2012 - Issue 1
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Original Articles

Aflatoxin in raw walnut kernels marketed in Tehran, Iran

M. Imani Nejad Food and Drug Research Laboratory Center, Food and Drug Organization, Tehran, IranCorrespondence[email protected]
&
A.D. Farahani Food and Drug Research Laboratory Center, Food and Drug Organization, Tehran, Iran
Pages 8-10 | Received 17 Aug 2011, Accepted 23 Oct 2011, Published online: 06 Jan 2012
 
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Abstract

The occurrence of aflatoxin in 35 samples of raw walnuts, which were randomly collected from Iranian supermarkets in Tehran, was examined. Analysis of aflatoxin was performed by solvent extraction and immunoaffinity clean-up followed by determination using high-performance liquid chromatography with fluorescence detection. Limits of detection (LOD) for the aflatoxins were 0.03–0.25 ng g−1. Limits of quantification (LOQ) were 0.12–0.80 ng g−1. Total aflatoxin concentrations in the samples ranged from 0 to 112.8 ng g−1. About 74.3% of the samples were contaminated with aflatoxins, of which 20.0% exceeded the maximum tolerable limit of 15 ng g−1 set by Codex.

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