Document Detail


Fungi, aflatoxins, and cyclopiazonic acid associated with peanut retailing in Botswana.
MedLine Citation:
PMID:  14717358     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Peanuts are important food commodities, but they are susceptible to fungal infestation and mycotoxin contamination. Raw peanuts were purchased from retail outlets in Botswana and examined for fungi and mycotoxin (aflatoxins and cyclopiazonic acid) contamination. Zygomycetes were the most common fungi isolated; they accounted for 41% of all the isolates and were found on 98% of the peanut samples. Among the Zygomycetes, Absidia corymbifera and Rhizopus stolonifer were the most common. Aspergillus spp. accounted for 35% of all the isolates, with Aspergillus niger being the most prevalent (20.4%). Aspergillus flavus/parasiticus were also present and accounted for 8.5% of all the isolates, with A. flavus accounting for the majority of the A. flavus/parasiticus identified. Of the 32 isolates of A. flavus screened for mycotoxin production, 11 did not produce detectable aflatoxins, 8 produced only aflatoxins B1 and B2, and 13 produced all four aflatoxins (B1, B2, G1, and G2) in varying amounts. Only 6 of the A. flavus isolates produced cyclopiazonic acid at concentrations ranging from 1 to 55 microg/kg. The one A. parasiticus isolate screened also produced all the four aflatoxins (1,200 microg/kg) but did not produce cyclopiazonic acid. When the raw peanut samples (n = 120) were analyzed for total aflatoxins, 78% contained aflatoxins at concentrations ranging from 12 to 329 microg/kg. Many of the samples (49%) contained total aflatoxins at concentrations above the 20 microg/kg limit set by the World Health Organization. Only 21% (n = 83) of the samples contained cyclopiazonic acid with concentrations ranging from 1 to 10 microg/kg. The results show that mycotoxins and toxigenic fungi are common contaminants of peanuts sold at retail in Botswana.
Authors:
Fingani A Mphande; Bupe A Siame; Joanne E Taylor
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of food protection     Volume:  67     ISSN:  0362-028X     ISO Abbreviation:  J. Food Prot.     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2004-01-13     Completed Date:  2004-03-11     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7703944     Medline TA:  J Food Prot     Country:  United States    
Other Details:
Languages:  eng     Pagination:  96-102     Citation Subset:  IM    
Affiliation:
Department of Biological Sciences, University of Botswana, Private Bag UB 00704, Gaborone, Botswana.
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MeSH Terms
Descriptor/Qualifier:
Aflatoxins / biosynthesis,  isolation & purification*
Arachis hypogaea / chemistry*,  microbiology*
Botswana
Consumer Product Safety
Food Contamination / analysis
Food Microbiology
Fungi / isolation & purification*,  metabolism
Indoles / isolation & purification*
Chemical
Reg. No./Substance:
0/Aflatoxins; 0/Indoles; 18172-33-3/cyclopiazonic acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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