カビ汚染乾燥果実から分離された黒色コウジカビの同定とフモニシンB2産生

概要

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Some species of black Aspergilli have been recently found to produce fumonisin B2 (FB2). Ten strains belonging to three Aspergillus species isolated from moldy dried fruits, which were found to be contaminated by FB2 and ochratoxin A, were assessed for FB2 production on 5% NaCl added Czapek yeast extract agar (5% NaCl CYA) plates and sterilized grape berries. Among them, 4 strains identified as A. niger/A. awamori were found to be able to produce FB2 on 5% NaCl CYA in the range of 12–22 μg/g (average positive: 17 μg/g) and on grape berries in the range of 0.72–13 μg/g (average positive: 5.1 μg/g), respectively. None of 5 strains identified as A. tubingensis produced detectable amounts of the toxin. These findings indicate that A. niger/A. awamori are responsible for the natural occurrence of FB2 in dried fruits. This is the first record of freshly isolated A. niger/A. awamori strains producing FB2 in Japan.
日本食品微生物学会の論文