Glycerol production by a novel osmotolerant yeast Candida glycerinogenes

Candida glycerinogenes, an osmotolerant yeast isolated from a natural sampl e in an environment of high osmotic pressure, had a modest sugar-tolerance and an extremely high glycerol productivity. The optimum conditions for gly cerol formation by C. glycerinogenes were a temperature of 29-33 degreesC a nd 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 phospha tes/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 high est concen tration of glycerol was 137 g/l from 260 g glucose/l. These results were ob tained by using a 30-l agitated fermenter under optimal fermentation condit ions. In ten batch-fermentations carried out in a 50,000-l airlift fermente r, an average yield of glycerol of 50.67% (w/w) and an average glycerol con centration of 121.9 g/l were obtained from an average 240.6 g glucose/l.