Effect of antioxidants and competing mycoflora on Fusarium verticillioides and F. proliferatum M. populations and fumonisin production on maize grain
C. Farnochi, A. M. Torres, N. Magan and S. N. Chulze
Journal of Stored Products Research Volume 41, Issue 2 , 2005, Pages 211-219
2005
บทคัดย่อ
This study was carried out to determine the temporal effect of the antioxidants butylated hydroxyanisol (BHA) and propyl paraben (PP) at doses of 500 and 1000 mg/g on the growth of Fusarium verticillioides and F. proliferatum inoculated on natural maize grain in the presence of the competing mycoflora and fumonisin production at 0.98 and 0.95 water activity (aw) over a 28-day storage period. The reduction in the log colony forming units (CFU) of Penicillium, Aspergillus and Fusarium populations was 10–100 fold depending on dose of BHA or PP, aw and time. However, the populations of all three groups were higher at 0.98 aw than 0.95 aw. BHA at 500 mg/g and 0.95 aw reduced the fumonisin content by 82% after 7–14 days incubation, but at the end of the experimental period the reduction was only 32%. A higher reduction in the level of fumonisin produced (77%) was achieved with BHA at 1000 g/g after 28 days. PP at 500 and 1000 mg/g decreased fumonisin production throughout the incubation period in the drier treatment, but at 0.98 aw control of toxin production was only achieved after 7–14 days. The reduction in the fumonisin levels could be due to the combined effect of antioxidants, and the competing mycoflora, mainly Aspergillus and Penicillium species.