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Research Journal of Microbiology
Year: 2006  |  Volume: 1  |  Issue: 2  |  Page No.: 190 - 197

Oxalic Acid Production by Aspergillus niger: Influence of Hydrogen Ion Concentration and Nitrogen Source

S.K. Mandal and P.C. Banerjee    

Abstract: Fermentative production of oxalic acid by Aspergillus niger NCIM 548 strain depended on the initial medium pH and better yield was obtained at pH 4-7. Yield of oxalic acid augmented (2.5 to 3-fold) if pH of the broth was maintained at 6-7 by occasional addition of alkali. The strain produced more oxalic acid from glucose with ammonium salts, especially diammonium hydrogen phosphate, as the N-source in comparison to other ammonium salts, NaNO3 and urea. With lactose as the C-source, yield of oxalic acid was maximum with ammonium dihydrogen phosphate closely followed by diammonium hydrogen phosphate; the yield was much better with urea than with ammonium nitrate or ammonium sulphate.

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