Journal
JOURNAL OF STORED PRODUCTS RESEARCH
Volume 44, Issue 2, Pages 169-172Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jspr.2007.10.001
Keywords
walnut; aflatoxin; protein; starch; oil content
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Fungal infection and mycotoxin contamination in fresh and stored kernels of walnut (Juglans regia) collected from different localities of Uttaranchal (India) were investigated. Fresh samples carry a combination of field as well as storage fungi. Species of Alternaria, Aspergillus and Penicillium were predominant. Thirty-nine percent of Aspergillits flavus isolates were toxigenic and produced up to 2170 mu g/l of aflatoxin B-1 in the liquid media. Aflatoxin B-1 was the most common mycotoxin encountered as a natural contaminant in the stored samples. Twenty-one percent of fresh samples contained allatoxin B-1 in low concentrations. The concentration of aflatoxin B, in fresh as well as stored samples was in the range of 140-1220 mu g/kg. Characteristic rotting was observed in fresh as well as stored samples. The walnut kernels exhibited significant reductions in the levels of oil, starch and protein content during fungal infection. (c) 2007 Elsevier Ltd. All rights reserved.
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