Kresoxim-methyl and famoxadone as activators of toxigenic potential of Aspergillus carbonarius

Food Additives & Contaminants: Part A Pub Date : 2019-10-10 DOI:10.1080/19440049.2019.1670869

C. Costa, M. B. Cerqueira, J. Garda-Buffon

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引用次数: 5

Abstract

ABSTRACT Ochratoxin A (OTA) is a secondary metabolite produced by filamentous fungi species belonging to the genera Penicillium and Aspergillus. The contamination of grapes by ochratoxigenic species occurs worldwide in regions of tropical and temperate climates. Better control of fungal growth is achieved through good cultural practice and proper selection of fungicides. Kresoxim-methyl and famoxadone are the most common fungicides used in vineyards. This study aimed at analysing the OTA production and toxigenic potential of Aspergillus carbonarius under fungicide treatment with famoxadone and kresoxim-methyl. The growth rate of A. carbonarius was evaluated by measuring the glucosamine content and the diameter of the fungal colonies. OTA production was quantified by HPLC analysis. The treatment with fungicides, kresoxim-methyl and famoxadone, significantly reduced the fungal growth, by 76% and 60%, respectively. However, the mycotoxin production was greater in the fungicide-treated groups than the control group, showing that even though the fungicides were effective in controlling fungal growth, they were ineffective against mycotoxin production. Graphical Abstract

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甲基克雷索辛和法莫沙酮对碳曲霉产毒潜能的激活作用

赭曲霉毒素A (Ochratoxin A, OTA)是由青霉菌属和曲霉菌属丝状真菌产生的次生代谢物。葡萄受致氧化物种污染的现象在热带和温带地区普遍存在。通过良好的培养方法和适当选择杀菌剂，可以更好地控制真菌的生长。甲基克雷索辛和法莫沙酮是葡萄园中最常用的杀菌剂。本研究旨在分析法莫沙酮和甲基克雷索辛两种杀菌剂处理下碳曲霉的OTA产量和产毒潜力。采用葡萄糖胺含量测定和菌落直径测定法对炭疽弧菌的生长速度进行了评价。HPLC法测定OTA产量。杀菌剂甲基克雷索辛和法莫沙酮处理显著降低了真菌生长，分别降低了76%和60%。然而，杀真菌剂处理组的霉菌毒素产量高于对照组，这表明尽管杀真菌剂对控制真菌生长有效，但对霉菌毒素的产生无效。图形抽象

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Food Additives & Contaminants: Part A

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