Occurrence and fumonisin B 2 producing potential of Aspergillus section Nigri in Brazil nuts

Bertholletia excelsa is the tree that produces Brazil nuts which have vast economic importance in the Amazon region and as an export commodity. The aim of this study was to assess the presence of Aspergillus section Nigri in Brazil nut samples at different stages of its production chain and to verif...

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Bibliographic Details
Published in:Mycotoxin research 2017-02, Vol.33 (1), p.49
Main Authors: Ferranti, Larissa S, Correa, Benedito, Fungaro, Maria Helena P, Iamanaka, Beatriz T, Massi, Fernanda P, Phippen, Christopher B W, Frisvad, Jens C, Taniwaki, Marta H
Format: Article
Language:English
Subjects:
Aspergillus - growth & development
Aspergillus - isolation & purification
Aspergillus - metabolism
Bertholletia - chemistry
Bertholletia - microbiology
Carcinogens, Environmental - analysis
Fumonisins - analysis
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Summary:Bertholletia excelsa is the tree that produces Brazil nuts which have vast economic importance in the Amazon region and as an export commodity. The aim of this study was to assess the presence of Aspergillus section Nigri in Brazil nut samples at different stages of its production chain and to verify the toxigenic potential for fumonisin B (FB ) production of these isolates along with the presence of this mycotoxin in Brazil nut samples. The fungal infection ranged from 0 to 80% at the different stages of the harvest and processing chain and the water activity of the nuts from 0.273 to 0.994. A total of 1052 A. section Nigri strains were isolated from Brazil nuts and 200 strains were tested for their ability to produce FB : 41 strains (20.5%) were FB producers with concentrations ranging from 0.09 to 37.25 mg/kg; 2 strains (1%) showed traces of FB , less than the detection limit (0.08 mg/kg); and 157 (78.5%) were not FB producers. Although several samples showed high contamination by A. section Nigri, no sample was contaminated by FB .
ISSN:1867-1632