B. cereus is capable of accumulating appreciable levels of PHB from glucose, xylose, lactose, whey, molasses, sugar cane bagasse, rice straw hydroysate when 2% from all substrates were used an alternative carbon for the PHB production. Ammonium sulphate was the best nitrogen source. C/N ratio was also one of the factors that affected the production of PHB. The ratio of C/N that reaches 20:1 was considered the best ratio to produce the highest production of PHB. The present study provide the useful data about the optimized conditions for PHB production by B. cereus that
can be utilized for industrial production of PHB, a fast emerging alternative of nonbiodegradable plastics.