earticle

영어

PHI3 productivities by Alcaligenes eutrophus from glucose, lactose, and whey were estimated by batch fermentations. From the fermentation of whey without pH control in Alcaligenes eutrophus, maximum conversion into PHB was 52.0%, where those by glucose and lactose were 75.0% and 53.0%, respectively. Carbon utilization rates were 90.0, 96.0, and 89.0% for whey, glucose, and lactose, respectively, at the final stage of fermentation in 45 h. When pH was controlled at optimal values of 7.2~7.3 during the fermentation, the yield of PHB could be obtained higher by about 6.0~7.0 % than without pH control. Though PHB yield by wasted whey was lower than those of glucose and lactose, since whey was cheaper by about 70% than glucose and lactose, the economic efficiency of PHB production by waste whey was estimated as higher than those by glucose and lactose.