Makut MD * and Ade-Ibijola OB
This investigation was carried out to determine the species of citric acid producing fungi found in the soil environment of Keffi metropolis. Soil samples were obtained from ten (10) different sites. Ten different fungal species were isolated from the ten different sites and these were Aspergillus flavus, A. niger A. fumigatus, Cladosporium herbarum, Rhizopus stolonifer, Alternaria alternata, Curvularia lunata, Absida corymbifera, Penicillium sp and Trichoderma viride. The results further showed that Absida corymbifera, Penicillium sp, Trichoderma viride, Aspergillus flavus and Aspergillus niger produced citric acid at varying levels of concentrations. Aspergillus niger produced the highest amount of 8.4μg ml-1 followed by Trichoderma viride which produced 5.1 μg ml-1, while Aspergillus flavus, Penicillium sp and Absida corymbifera produced 3.2 μg ml-1 , 2.0 μg ml-1 and 1.4 μg ml-1, respectively. The results of this investigation revealed that strains of citric acid producing fungi are present in the soil environment of Keffi metropolis, Nasarawa state, Nigeria, and these could be harnessed locally for large scale industrial production of citric acid.
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