The improvement of cephalosporin C production by fed-batch culture of Cephalosporium acremonium M25 using rice oil

The objective of this study is to improve cephalosporin C (CPC) production by optimization of medium and culture conditions. A statistical method was introduced to optimize the main culture medium. The main medium for CPC production was optimized using a statistical method. Glucose and corn steep liquor (CSL) were found to be the most effective factors for CPC production. Glucose and CSL were optimized to 2.84 and 6.68%, respectively. CPC production was improved 50% by feeding of 5% rice oil at day 3rd and 5th day during the shake flask culture of C acremonium M25. The effect of agitation speeds on CPC production in a 2.5-L bioreactor was also investigated with fed-batch mode. The maximum cell mass (54.5 g/L) was obtained at 600 rpm. However, the maximum CPC production (0.98 g/L) was obtained at 500 rpm. At this condition, the maximum CPC production was improved about 132% compared to the result with batch flask culture.