Abstract
In agricultural areas, Aspergillus flavus, Aspergillus fumigatus and Aspergillus parasiticus are commonly identified in various feedstuffs and bioaerosols originated from feed handling. Some isolates belonging to these fungal species could produce mycotoxins and constitute a risk factor for human and animal health. In this study, Fourier-transform infrared spectroscopy was used for a rapid detection and characterization of 99 isolates collected from agricultural areas. The results showed a first cluster corresponding to strains previously attributed to the A. fumigatus group according to current taxonomic concepts, and a second cluster divided in 2 groups around reference strains of A. flavus and A. parasiticus species. The toxigenic capacity of isolates was evaluated by high performance liquid chromatography coupled to mass spectrometry. In the A. flavus group, only 6 strains of A. parasiticus and 4 strains of A. flavus were able to produce aflatoxins on culture media. FT-IR spectroscopy, respectively, allowed the differentiation of non-toxigenic and toxigenic A. flavus and A. parasiticus isolates at 75 and 100%. Discrimination between toxigenic and non-toxigenic A. fumigatus was not possible because all of the isolates produced at least one mycotoxin.
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Abbreviations
- FT-IR spectroscopy:
-
Fourier-transform infrared spectroscopy
- HPLC-MS:
-
High performance liquid chromatography coupled to mass spectrometry
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Acknowledgments
This work was supported by a grant from OSEO (n°A0703015). The authors thank R. Picquet and V. Bouchart (Laboratoire Départemental Frank Duncombe, Conseil Général du Calvados) for their contribution to the analysis of mycotoxins by HPLC–MS. We would also like to acknowledge Margaret Dearing for improving the English of the manuscript.
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Garon, D., El Kaddoumi, A., Carayon, A. et al. FT-IR Spectroscopy for Rapid Differentiation of Aspergillus flavus, Aspergillus fumigatus, Aspergillus parasiticus and Characterization of Aflatoxigenic Isolates Collected from Agricultural Environments. Mycopathologia 170, 131–142 (2010). https://doi.org/10.1007/s11046-010-9304-7
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DOI: https://doi.org/10.1007/s11046-010-9304-7