Production of citric acid from Aspergillus niger using sugar beet as substrate

Citric Acid, one of the most important industrial organic acids, is found in all citrus fruits. Aspergillus niger produces citric acid from various substrates. Aspergillus niger was isolated from orange peel and UV treatment was given for strain improvement. The amount of citric acid produced by A. niger was estimated using different substrates. Sugar beet was chosen for the study and effects of different nitrogen and carbon sources were tested on the production of citric acid. At pH 6 there was optimum production. The study was also done to determine effects of different metals on production of citric acid by A. niger. Day-wise production for citric acid was tested with 4(th) day giving optimum production.