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Survey of mycoflora counts, aflatoxin production and induced biochemical changes in walnut kernels

Authors
Journal
Journal of Stored Products Research
0022-474X
Publisher
Elsevier
Publication Date
Volume
44
Issue
2
Identifiers
DOI: 10.1016/j.jspr.2007.10.001
Keywords
  • Walnut
  • Aflatoxin
  • Protein
  • Starch
  • Oil Content
Disciplines
  • Biology

Abstract

Abstract 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 Aspergillus flavus isolates were toxigenic and produced up to 2170 μg/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 aflatoxin B 1 in low concentrations. The concentration of aflatoxin B 1 in fresh as well as stored samples was in the range of 140–1220 μg/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.

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