A process for increasing the excretion rate of citric acid during the fermentation by the fungus Aspergillus niger

摘要

A process for increasing the production rate of citric acid during the fermentation by the fungus Aspergillus, preferably Aspergillus niger, wherein the fungus is grown in presence of air, using a substrate with no trace metals, and with an increased initial sucrose concentration compared to conventional media, and subsequently to the initiation of acid excretion the fermentation broth is diluted instantly to 35 to 65%, preferably 40 to 60%, most preferred to 50% of the initial sucrose concentration by means of water, while afterwards the fermentation and the isolation of the acid proceed in a conventional manner.