Optimization of submerged culture conditions for the mycelial growth and exo-biopolymer production by Cordyceps militaris

AIMS: The objective of the present study was to determine the optimal culture conditions for exo-biopolymer production by Cordyceps militaris in shake flask culture. METHODS AND RESULTS: The optimal temperature and initial pH for both mycelial growth and exo-biopolymer production by Cordyceps militaris in shake flask culture were found to be 20 degrees C and 6.0, respectively. Sucrose (40 g x l(-1)) and corn steep powder (10 g x l(-1)) were the most suitable carbon and nitrogen source for both mycelial growth and exo-biopolymer production. CONCLUSION: Under optimal culture conditions, the maximum exo-biopolymer concentration in a 5-l jar fermenter indicated 10.3 g x l(-1), which was approximately three times higher than that in shake flask culture. SIGNIFICANCE AND IMPACT OF THE STUDY: This process can have a significant impact on the industrial scale when sucrose and corn steep powder were used as carbon and nitrogen source.