The effect of temperature, pH, and initial glucose concentration on the kinetics of ethanol production by Zymomonas mobilis in batch fermentation

✍ Scribed by Franklin G. King; Muhammad A. Hossain

• Publisher: Springer Netherlands
• Year: 1982
• Tongue: English
• Weight: 302 KB
• Volume: 4
• Category: Article
• ISSN: 0141-5492
• DOI: 10.1007/bf00131577

✦ Synopsis

Zymomonas mobilis, strain ATCC 10988, was used to evaluate the effects of pH (5.0 to 8.0), temperature (30°C to 40°C), and initial glucose concentration(75 g/C to 150 g/6) on the kinetics of ethanol production from glucose using batch fermentation. Specific ethanol production rate was maximum and nearly constant over a pH range of 6.0 to 7.5. End-of-batch ethanol yield and specific growth rate were insensitive to pH in the range of 5.0 to 7.5. End-of-batch ethanol yield was maximum and nearly constant between 30°C and 37°C but decreased by 24% between 37°C and 40°C. All other kinetic parameters are greatest at 34°C. End-of-batch ethanol yield is maximum at an initial glucose concentration of I00 g/l. Specific growth rate reaches a maximum at 75 g/Z, but specific ethanol production rate decreases throughout the range. The optimum initial glucose concentration of I00 g/£ gives the highest ethanol yield at a specific ethanol production rate less than 10% below the maximum observed.