Effect of water activity and temperature on growth ofAspergillus carbonarius andAspergillus tubingensis and their interactions on ochratoxin A production
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Aspergillus sectionNigri are described as the main source of ochratoxin A (OTA) contamination in grapes and wine worldwide. The grape-growing area in Argentina has a wide latitudinal extension with ecological variations that allow the classification of well-demarcated regions. The aims of this study were: to determine the effect of eco-physiological parameters on growth ofAspergillus tubingensis andAspergillus carbonarius and to evaluate the interaction between these species on OTA production in synthetic grape juice medium under different water activity (aw) and temperature conditions. The results showed that optimal growth conditions forA. tubingensis andA. carbonarius were 0.980 aw and 28 °C, howeverA. tubingensis grew faster thanA. carbonarius at all temperatures and aw tested. OTA production byA. carbonarius was favoured at 20 °C and 0.950-0.965 aw, during 14 days of incubation. The effect ofA. tubingensis on OTA production byA. carbonarius was mainly dependent on temperature. At 35 °C,A. tubingensis reduced the OTA production while this effect was not observed at 20 °C. More OTA could be produced as a defence reaction against fungal competitors to maintain niche colonisation, but in this study no effects by a related species were observed.
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| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 182 | 88 | 4 |
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Effect of water activity and temperature on growth ofAspergillus carbonarius andAspergillus tubingensis and their interactions on ochratoxin A production
In: World Mycotoxin JournalSearch for other papers by M.L. Chiotta in
Current site
Google Scholar
PubMed
Search for other papers by D.M. Sosa in
Current site
Google Scholar
PubMed
Search for other papers by M.L. Ponsone in
Current site
Google Scholar
PubMed
Search for other papers by S.N. Chulze in
Current site
Google Scholar
PubMed
Aspergillus sectionNigri are described as the main source of ochratoxin A (OTA) contamination in grapes and wine worldwide. The grape-growing area in Argentina has a wide latitudinal extension with ecological variations that allow the classification of well-demarcated regions. The aims of this study were: to determine the effect of eco-physiological parameters on growth ofAspergillus tubingensis andAspergillus carbonarius and to evaluate the interaction between these species on OTA production in synthetic grape juice medium under different water activity (aw) and temperature conditions. The results showed that optimal growth conditions forA. tubingensis andA. carbonarius were 0.980 aw and 28 °C, howeverA. tubingensis grew faster thanA. carbonarius at all temperatures and aw tested. OTA production byA. carbonarius was favoured at 20 °C and 0.950-0.965 aw, during 14 days of incubation. The effect ofA. tubingensis on OTA production byA. carbonarius was mainly dependent on temperature. At 35 °C,A. tubingensis reduced the OTA production while this effect was not observed at 20 °C. More OTA could be produced as a defence reaction against fungal competitors to maintain niche colonisation, but in this study no effects by a related species were observed.
| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 182 | 88 | 4 |
| Full Text Views | 18 | 0 | 0 |
| PDF Views & Downloads | 11 | 0 | 0 |
