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Research Journal of Microbiology
Year: 2006  |  Volume: 1  |  Issue: 6  |  Page No.: 540 - 545

Comparison of Citric Acid Production by Aspergillus niger ATCC 9029 and ATCC 12846 on Corn Distillers` Grains with Solubles

Gang Xie and Thomas P. West    

Abstract: Two 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 9029 after 240 h was higher on untreated grains than on autoclaved grains or acid-hydrolyzed grains. In contrast, citric acid production by A. niger ATCC 12846 after 240 h was higher on autoclaved grains than on untreated grains or acid-hydrolyzed grains. Methanol or phosphate supplementation to the grains failed to stimulate citric acid production by either A. niger strain. Biomass production by both strains after 240 h was higher on the treated grains than the untreated grains. The highest citric acid yields were observed following growth of both strains on the untreated grains.

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