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Research Journal of Microbiology
Year: 2006  |  Volume: 1  |  Issue: 3  |  Page No.: 228 - 233

Citric Acid Production by Aspergillus niger on Corn Distillers` Grains with Solubles

Gang Xie and Thomas P. West    

Abstract: Selected strains of the fungus Aspergillus niger were screened for their ability to produce citric acid on corn distillers` dried grains with solubles. It was determined that citric acid production by A. niger ATCC 11414 or ATCC 201122 after 240 h was higher on untreated grains than on autoclaved grains or acid-hydrolyzed grains. Methanol supplementation to the grains was only capable of stimulating citric acid production by A. niger strains ATCC 26550 and ATCC 11414. Biomass production by the selected strains after 240 h on the untreated and treated grains varied according to the strain being studied. The highest yield of citric acid was obtained for ATCC 11414 after it was supplemented with phosphate.

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