Opimization of Conditions for Production of Uridine by a Mutant of Bacillus subtilis

抄録

This work was designed to examine culture variables influencing the production of uridine by the Bacillus subtilis mutant No. 556. A combination of corn steep liquor (4%) + corn gluten meal (0.7%) + urea (2%) was the most suitable nitrogen source for the production of uridine ; a high level of ammonium ions in the medium brought about abundant cell growth in the early stage of incubation and was detrimental to the fermentation. The addition of calcium salts, such as C_aCO₃ and C_aCl₂, was also essential for obtaining high yields of uridine. Among the carbon sources tested, glucose gave the best result. The optimum temperature and oxygen transfer rate for producing uridine were around 38°C and 20 x 10^-7 molO₂ / min / ml, respectively. Under optimum conditions in a 6000-liter fermentor, strain No. 556 produced 65mg/ml of uridine from 18% glucose.