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Articles by Victor Chijioke Okereke
Total Records ( 1 ) for Victor Chijioke Okereke
  Omolola Oluwafunmilayo Adaramaja , Monday Ilegimokuma Godwin-Egein and Victor Chijioke Okereke
  Background and Objective: The incidence of mycotoxigenic moulds in spices in Southern Nigeria has increased under the climate change. The objective of the study was to examine the effect of different water activities on lag phase prior to growth and growth rate of three toxigenic and a non-toxigenic strain of Aspergillus section Flavi on ginger-based medium at 28±2°C. Materials and Methods: About 6-day old mycelia of Aspergillus flavus was used as inoculum and 2 μL of inocula of each of the A. flavus strains centrally inoculated into each of the plates. The experiment was a 5×4 factorial in completely randomized design (CRD) replicated thrice. Results: Statistical analysis indicated that aw significantly (p<0.001) affected lag phases and growth rates in all the strain studied. The lag phases significantly increased with imposition of water stress. The shortest average lag phase (1.2 days) was at 0.98 and 0.995 aw while the longest (2.5 days) was at 0.90 aw. Overall, the growth of aflatoxigenic strains was similar over the 0.90 - 0.98 aw ranges but optimal condition was found to be at 0.98 aw. Non-aflatoxigenic strain had maximum growth at 0.95 aw. Under severe aw stress (0·85 aw), no growth responses were observed, with all the strains unable to grow within the 12 days incubation period. The combined factors (strain xaw) showed significant (p<0.001) interaction for growth rate while there was no evidence of statistical interaction (p = 0.2) effect on the lag phases prior to growth of strains. Conclusion: The result from this study could be used in decision-making process in relation to aw during ginger production and also contribute to optimal strategy selection in the control of aflatoxin contamination in ginger in the store.
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