AI Article Synopsis
- This study examined how temperature and water levels affect the growth and production of ochratoxin A (OTA) by a fungus called Aspergillus carbonarius using samples from Tunisian vineyards.
- The researchers found that the best water level for both growth and OTA production was 0.99, while the ideal temperature for growth was 30 degrees Celsius, with a notable decline at 37 degrees Celsius.
- Maximum toxin production occurred at cooler temperatures (15 to 25 degrees Celsius), and significant OTA levels were produced within just 5 days of incubation, revealing similarities and some differences between Tunisian and other grape isolates.
Article Abstract
This study investigated the effects of temperature (15 to 37 degrees C) and water activity (0.90 to 0.99) on the growth and production of ochratoxin A (OTA) by Aspergillus carbonarius cultured on synthetic nutrient medium (SNM) after 5 and 10 d of incubation. Total of 8 ochratoxigenic A. carbonarius, isolated from vineyards located in different regions of Tunisia, were used. Growth data were modeled by the flexible model of Baranyi and growth rates at each set of conditions were obtained. For both growth and OTA production, optimal water activity was 0.99; however, optimal temperature varied. The optimal temperature for growth was 30 degrees C. At 37 degrees C, the growth rate decreased significantly (P < 0.05). Maximum toxin production occurred at temperatures in the range of 15 to 25 degrees C with the optimum one depending on the isolate tested. Significant amounts of OTA were produced after only 5 d of incubation. Our results showed that A. carbonarius isolated from Tunisian grapes behave as those from European and Australian grapes, as reported in the literature, although some differences in trends for growth and OTA production were observed.
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| http://dx.doi.org/10.1111/j.1750-3841.2009.01484.x | DOI Listing |
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