Medium Optimization for the Production of Fibrinolytic Enzyme byPaenibacillussp. IND8 Using Response Surface Methodology

Abstract

Production of fibrinolytic enzyme by a newly isolatedPaenibacillussp. IND8 was optimized using wheat bran in solid state fermentation. A 25full factorial design (first-order model) was applied to elucidate the key factors as moisture, pH, sucrose, yeast extract, and sodium dihydrogen phosphate. Statistical analysis of the results has shown that moisture, sucrose, and sodium dihydrogen phosphate have the most significant effects on fibrinolytic enzymes production (P<0.05). Central composite design (CCD) was used to determine the optimal concentrations of these three components and the experimental results were fitted with a second-order polynomial model at 95% level (P<0.05). Overall, 4.5-fold increase in fibrinolytic enzyme production was achieved in the optimized medium as compared with the unoptimized medium.