Mycotoxigenic fungi in Portuguese wine regions : fumonisin B2 and ochratoxin A
Studies were conducted between 2001 and 2003 to evaluate the incidence of ochratoxigenic strains in Portuguese wine-grapes. At that time, the main responsible for ochratoxin A production in grapes were found to be Aspergillus carbonarius with a production mean of 1.13 mg/kg and some strains from the...
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| Outros Autores: | , |
| Formato: | conferenceObject |
| Idioma: | eng |
| Publicado em: |
2011
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| Assuntos: | |
| Texto completo: | http://hdl.handle.net/1822/16174 |
| País: | Portugal |
| Oai: | oai:repositorium.sdum.uminho.pt:1822/16174 |
| Resumo: | Studies were conducted between 2001 and 2003 to evaluate the incidence of ochratoxigenic strains in Portuguese wine-grapes. At that time, the main responsible for ochratoxin A production in grapes were found to be Aspergillus carbonarius with a production mean of 1.13 mg/kg and some strains from the Aspergillus niger aggregate with a production mean of 0.14 mg/kg. At that time also, all the black aspergilli isolates were preserved in glycerol and stored at -80 ºC. Since recently A. niger was reported as a producer of the mycotoxin fumonisin B2, its levels produced by black aspergilli isolates from the Portuguese grapes were investigated. Approximately 29% of A. niger aggregate strains were found to produce it between 0.003–6.0 mg/kg with a mean of 0.66 mg/kg and only 6% produced more than 1 mg/kg. The incidence and distribution of fumonisinogenic strains among five Portuguese wine-regions is also presented and correlated with data of the ochratoxigenic ones. |
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