Impact of Fusarium moniliforme and F. proliferatum colonisation of maize on calorific losses and fumonisin production under different environment conditions.
Marin, S., Homedes, V., Sanchis, V., Ramos, A. J. and Magan, N.
Journal of stored products research. Vol: 35 Issue: 1 Pages: 15-26.
1999
บทคัดย่อ
The effect of water activity (aw, 0.92-0.98), temperature (15-30 degrees C) and incubation period (2-4 weeks) on growth, calorific losses and fumonisin production by one isolate of Fusarium moniliforme and two of F. proliferatum were studied on maize-based substrates. The calorific losses (kJ) of maize flour due to fungal growth in relation to temperature and aw were quantified and found to be maximal at 0.98 aw (17-64%, after 4 weeks, depending on temperature level) but negligible at 0.92 aw (0-9%). This suggests that growth of mycotoxigenic Fusarium can contribute to both nutritional losses and toxic contamination of staple substrates. Total fumonisin concentrations were optimally produced on ground maize at 30 degrees C and 0.98 aw and were 143.9 micrograms g(-1) for F. moniliforme, and 51.0-104.3 micrograms g(-1) for the F. proliferatum isolates, respectively. In general, both fumonisin production and fungal biomass decreased with temperature and aw. Good correlation was found between fumonisin concentration and fungal biomass, while calorific losses correlated inversely with both fumonisin concentration and fungal biomass. Single, two-, three- and four-way interactions of aw, temperature, time and isolate were all significant (P < 0.01) for calorific losses, and for fumonisin production, with the exception of the aw x temperature x time interaction.