Spoilage fungi and their mycotoxins in commercially marketed chestnuts

A nationwide survey was carried out to assess mould spoilage of Castanea sativa nuts sold in Canadian grocery stores in 1998–99. Morphological and cultural characters, along with secondary metabolite profiles derived from thin-layer chromatography, were used to sort and identify fungi cultured from...

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Veröffentlicht in:International journal of food microbiology 2003-11, Vol.88 (1), p.69-77
Hauptverfasser: Overy, David P., Seifert, Keith A., Savard, Marc E., Frisvad, Jens C.
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container_title International journal of food microbiology
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creator Overy, David P.
Seifert, Keith A.
Savard, Marc E.
Frisvad, Jens C.
description A nationwide survey was carried out to assess mould spoilage of Castanea sativa nuts sold in Canadian grocery stores in 1998–99. Morphological and cultural characters, along with secondary metabolite profiles derived from thin-layer chromatography, were used to sort and identify fungi cultured from nut tissue. Three mycotoxigenic fungi dominated ( Penicillium crustosum, Penicillium glabrum/ spinulosum and Penicillium discolor) and were isolated at frequencies of 67.1%, 18.6% and 17.7%, respectively, from a total sample size of 350 nuts. Another mycotoxin producer, Aspergillus ochraceus was also isolated, but at a much lower frequency. HPLC and diode array detection were used to confirm the suspected presence of the mycotoxins penitrem A, chaetoglobosin A and C, emodin and ochratoxin A in extracts prepared from naturally infected nut tissue. To the best of our knowledge, this is the first time emodin has been found in a naturally contaminated food source.
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Morphological and cultural characters, along with secondary metabolite profiles derived from thin-layer chromatography, were used to sort and identify fungi cultured from nut tissue. Three mycotoxigenic fungi dominated ( Penicillium crustosum, Penicillium glabrum/ spinulosum and Penicillium discolor) and were isolated at frequencies of 67.1%, 18.6% and 17.7%, respectively, from a total sample size of 350 nuts. Another mycotoxin producer, Aspergillus ochraceus was also isolated, but at a much lower frequency. HPLC and diode array detection were used to confirm the suspected presence of the mycotoxins penitrem A, chaetoglobosin A and C, emodin and ochratoxin A in extracts prepared from naturally infected nut tissue. 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subjects Aspergillus
Aspergillus ochraceus - isolation & purification
Aspergillus ochraceus - metabolism
Biological and medical sciences
Castanea sativa
chaetoglobosin A
chaetoglobosin C
Chaetoglobosins
chemotaxonomy
chestnuts
Chromatography, Thin Layer
Emodin
food contamination
Food Contamination - analysis
Food industries
Food Microbiology
food pathogens
food spoilage
Fruit and vegetable industries
Fundamental and applied biological sciences. Psychology
isolation
molds (fungi)
mycotoxins
Mycotoxins - analysis
Nuts - microbiology
Ochratoxin A
pathogen identification
Penicillium
Penicillium - isolation & purification
Penicillium - metabolism
Penitrem A
toxigenic strains
Trichoderma
title Spoilage fungi and their mycotoxins in commercially marketed chestnuts
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