Abstract
This study was carried out to determine the efficacy of the phenolic antioxidant propyl paraben (PP) under different interacting water activity ( a W) and temperature regimes on lag phase, growth rate and Ochratoxin A production by Aspergillus section Nigri strains. In this experiment six A spergillus section Nigri strains were used. Peanut meal extract agar (PMEA) was prepared at 2%. The a W of the medium was adjusted to 0.995, 0.980 and 0.930, PP levels of 1, 5, 10 and 20 mmol/L were added to the basic medium. Plates were inoculated and incubated for 30 days at 18 and 25 °C. Lag phase (h) and radial growth rates (mm/day) were calculated. In control treatments, the lag phase increased and the growth rate decreased as a W reduced in all assayed strains. At all a W levels, when antioxidant concentrations increased the growth rate decreased. At 5, 10 and 20 mmol/L of PP the strains were not able to reach the exponential phase and completely inhibited fungal growth and OTA production regardless of a W used in all the evaluated strains.
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