Molasses is a desirable raw material for citric acid fermentation because of its availability and relatively low price. However due to the presence of higher amount of sugars and minerals, the growth of Aspergillus niger is inhibited. Use of fibrous raw materials as carrier substrate in molasses medium may adsorb the sugars and minerals and relieve the fungal growth inhibition. Corncobs was used as support material in molasses medium for the citric acid production by Aspergillus niger in SSF. Maximum production of citric acid requires the optimization of different parameters. The parameter like pH, temperature, and carbon and nitrogen sources was optimized to achieved maximum citric acid production within shortest possible time period.
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