Treatment of beet molasses for citric acid production by a potent strain of Aspergillus niger van Tieghem

✍ Scribed by M.S. El-Abyad; F.A. Hamissa; Anbar S. Gad

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 583 KB
• Volume: 39
• Category: Article
• ISSN: 0960-8524
• DOI: 10.1016/0960-8524(92)90140-s

✦ Synopsis

This work was designed to investigate the necessary treatments" of crude beet molasses (CBM) to improve its suitability as a substrate for citric acid (CA) production by a potent strain of Aspergillus niger van Tieghem. The results obtained showed that supplementing CBM with 0"05% N as (NH4):~O 4 improved CA yield and conversion coefficient. The amount of inorganic-P contained in CBM (0.072%) was found to be sufficient to support fermentation. Removal of suspended matter (mud) by centrifugation increased CA yield, but treatment of the mud-free molasses with ionexchange resins decreased the yield and conversion coefficient. Addition of low molecular weight alcohols to treated beet molasses (TBM) did not improve the yield of CA. Addition of potassium ferrocyanide (0"04%) to the medium immediately after autoclaving gave a better yield of CA than when it was added before autoclaving.