Abstract
A novel strain Penicillium oxalicum PJ02 was isolated for the production of exo-pectinase, endo-pectinase, carboxymethylcellulase (CMCase) and xylanase. Response surface methodology (RSM) was employed to optimize orange peel submerged fermentation for pectinase production. Plackett–Burman factorial design was used to select significant parameters. Temperature and NH4Cl concentration had significant influence on exo-pectinase production. The central composite design was used to generate a total of 22 fermentation experiments. The statistical results indicated that the optimum temperature for exo-pectinase and endo-pectinase production was 36.5 °C, and optimal NH4Cl concentration was 1.12 g/L. Under this condition, the yield of exo-pectinase was 36.88 U/mL, endo-pectinase was 0.62 U/mL, which are in close agreement with the values predicted by the model. The CMCase and xylanase yield in the same medium were 0.38 and 0.57 U/mL, respectively. RSM was also used to analyse the effect of independent variables on CMCase and xylanase production.
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