Abstract
Quality of dried sorted pistachio nuts could have an important role in the aflatoxin B 1 content of final pistachio lot. In order to determine this effect in different pistachio cultivars, samples of Fandoghi, Ahmad Aghaei and Kale-Ghoochi lots were divided to 7 categories based on the physical appearance of dried pistachios which were yellowish-brown stain, dark-greyish stain, large, medium, tiny, damaged and non-split. The aflatoxin content was measured by the TLC-Scanner method and results showed that the average aflatoxin content of the yellowish-brown stained nuts of the Fandoghi, Ahmad Aghaei, and Kale-Ghoochi cultivars were 136.2, 632.4 and 120.3 ng g -1 , respectively, while in the dark-greyish stained nuts contained 28.7, 292.8, 7.3 ng g -1 , respectively. The amount of aflatoxin in the Fandoghi, Ahmad Aghaei and Kale-Ghoochi lots can be significantly (P<0.05) reduced to 94.6%, 97.2% and 98.8%, respectively, if all the stained nuts were removed from the lot during sorting. The highest aflatoxin B 1 content was detected in the stained nuts of all the cultivars studied. This study showed that segregation or removal of all the stained nuts from the unstained portion during the sorting process could contribute to the reduction of aflatoxin content in the final dried pistachio lot.
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