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Toxins 2015, 7(9), 3512-3537; doi:10.3390/toxins7093512

Taxonomic Characterization and Secondary Metabolite Profiling of Aspergillus Section Aspergillus Contaminating Feeds and Feedstuffs

1,2,* , 1,2,†
,
2,3,†
and
1,2,†
1
Laboratorio de Micología Molecular, Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Bernal 1876, Argentina
2
Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires 1033, Argentina
3
Escuela de Producción, Tecnología y Medio Ambiente, Universidad Nacional de Río Negro, Villa Regina 8336, Argentina
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Deepak Bhatnagar
Received: 4 July 2015 / Revised: 21 August 2015 / Accepted: 26 August 2015 / Published: 2 September 2015
(This article belongs to the Section Mycotoxins)
View Full-Text   |   Download PDF [1041 KB, uploaded 2 September 2015]   |  

Abstract

Xerophilic fungal species of the genus Aspergillus are economically highly relevant due to their ability to grow on low water activity substrates causing spoilage of stored goods and animal feeds. These fungi can synthesize a variety of secondary metabolites, many of which show animal toxicity, creating a health risk for food production animals and to humans as final consumers, respectively. Animal feeds used for rabbit, chinchilla and rainbow trout production in Argentina were analysed for the presence of xerophilic Aspergillus section Aspergillus species. High isolation frequencies (>60%) were detected in all the studied rabbit and chinchilla feeds, while the rainbow trout feeds showed lower fungal charge (25%). These section Aspergillus contaminations comprised predominantly five taxa. Twenty isolates were subjected to taxonomic characterization using both ascospore SEM micromorphology and two independent DNA loci sequencing. The secondary metabolite profiles of the isolates were determined qualitatively by HPLC-MS. All the isolates produced neoechinulin A, 17 isolates were positive for cladosporin and echinulin, and 18 were positive for neoechinulin B. Physcion and preechinulin were detected in a minor proportion of the isolates. This is the first report describing the detailed species composition and the secondary metabolite profiles of Aspergillus section Aspergillus contaminating animal feeds. View Full-Text
Keywords: animal feed spoilage; xerophilic species; teleomorphs; mycotoxins; scanning electron microscopy animal feed spoilage; xerophilic species; teleomorphs; mycotoxins; scanning electron microscopy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Greco, M.; Kemppainen, M.; Pose, G.; Pardo, A. Taxonomic Characterization and Secondary Metabolite Profiling of Aspergillus Section Aspergillus Contaminating Feeds and Feedstuffs. Toxins 2015, 7, 3512-3537.

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