Comparison of hyper producer Aspergillus niger cultures (IFS-5, IFS-6 and IFS-17) forcitric acid fermentation in surface culture
2004
Ikram-ul-Haq | Ali, S.,Government College Univ., Lahore (Pakistan). Dept. of Botany)Qadeer, M.A
The present investigation deals with the time course study during citric acid productionby surface culture technique using three different mutant cultures of A. niger (IFS-5, IFS-6and IFS-17) and their comparison on kinetic basis. The mutant strain of A. niger IFS-17 is abetter citric acid producer (i.e. Yp/s=0.492 g/g) due to faster growth rate. Time required formaximal citric acid production depends mainly on the fermentation design, type of the strainand composition of basal medium. Mutation can raise the status of fermentation process. Themutant IFS-17 is D-glc-resistant and has been preserved in paraffin oil as a master culture.Proper aeration, suitable depth and Cu++ ions addition in the fermentation medium mayincrease the mycellial branching level and subsequently citric acid productivity.
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