Aspergillus species from Brazilian dry beans and their toxigenic potential.

摘要: Aspergilli are common contaminants of food and feed a major source mycotoxins. In this study, 87 Aspergillus strains were isolated from beans 14 different cities in Brazil identified to the species level based on partial calmodulin β-tubulin sequence data. All green spored isolates belonged section Flavi as A. flavus (n = 39) or pseudocaelatus 1). black Nigri niger 24) luchuensis 10), while yellow westerdijkiae 7), ostianus 3), ochraceus 1) wentii 2). The toxigenic potential these was studied by prospection genes three mycotoxin clusters: aflatoxin (seven checked), ochratoxin A (four genes) fumonisin (ten two intergenic regions). Genes involved biosynthesis only detected isolates: 17/39 proved contain all tested, others missed one more genes. full complement isolates. Finally, no for any Our work suggests that production some form largest risks Brazilian beans.