Abstract
A real-time PCR system directed against the nor-1 gene of the aflatoxin biosynthetic pathway as a target sequence has been applied to detect an aflatoxinogenic A. flavus strain in plant-type foods like maize, pepper and paprika. The system is based on the TaqMan fluorescent probe technology. The copy numbers of the nor-1 gene were compared to conventional cfu data obtained from the same set of samples. In general, a good correlation between nor-1 gene copy number and the cfu data was observed; however, the nor-1 copy numbers were always higher. It was shown that the system is specific for nor-1 containing species.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Aflatoxins / biosynthesis*
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Aflatoxins / chemistry
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Aflatoxins / genetics
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Alcohol Oxidoreductases / genetics*
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Alcohol Oxidoreductases / metabolism
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Aspergillus flavus / genetics
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Aspergillus flavus / growth & development
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Aspergillus flavus / metabolism*
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Base Sequence
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Capsicum / microbiology
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Colony Count, Microbial
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DNA, Fungal / analysis*
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DNA, Fungal / genetics
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Fungal Proteins*
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Genes, Fungal / genetics
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NAD (+) and NADP (+) Dependent Alcohol Oxidoreductases
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Polymerase Chain Reaction
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Taq Polymerase
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Zea mays / microbiology
Substances
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Aflatoxins
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DNA, Fungal
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Fungal Proteins
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Alcohol Oxidoreductases
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NAD (+) and NADP (+) Dependent Alcohol Oxidoreductases
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norsolorinic acid ketoreductase
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Taq Polymerase