Glycerol production by a novel osmotolerant yeast Candida glycerinogenes.
Candida glycerinogenes, an osmotolerant yeast isolated from a natural sample in an environment of high osmotic pressure, had a modest sugar-tolerance and an extremely high glycerol productivity. The optimum conditions for glycerol formation by C. glycerinogenes were a temperature of 29-33 degrees C and a pH of 4-6. The optimum medium for glycerol production consisted of 230-250 g glucose/l, 2 g urea/l and 5 ml corn steep liquor/l (55-65 mg phosphates/l); the pH was not adjusted. The highest yield of glycerol was 64.5% (w/w) based on consumed glucose from 240 g glucose/l, and the highest concentration of glycerol was 137 g/l from 260 g glucose/l. These results were obtained by using a 30-l agitated fermentor under optimal fermentation conditions. In ten batch-fermentations carried out in a 50,000-l airlift fermentor, an average yield of glycerol of 50.67% (w/w) and an average glycerol concentration of 121.9 g/l were obtained from an average 240.6 g glucose/l.
Zhuge
J
J
Research Center of Industrial Microorganisms and Research and Design Center of Glycerol Fermentation, School of Biotechnology, South-Yangtze University, Wuxi, China. jzhuge@wxuli.edu.cn
Fang
H Y
HY
Wang
Z X
ZX
Chen
D Z
DZ
Jin
H R
HR
Gu
H L
HL
D000332:Aerobiosis; D019149:Bioreactors; D002175:Candida / Q000378:metabolism*; D003470:Culture Media; D005285:Fermentation; D005947:Glucose / Q000378:metabolism / Q000494:pharmacology; D005990:Glycerol / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D009994:Osmolar Concentration; D010710:Phosphates / Q000378:metabolism / Q000494:pharmacology; D013696:Temperature; D014508:Urea / Q000378:metabolism / Q000494:pharmacology
D003470:Culture Media; D010710:Phosphates; D014508:Urea; D005947:Glucose; D005990:Glycerol