Response-Surface Statistical Optimization of Submerged Fermentation for Pectinase and Cellulase Production by Mucor circinelloides and M. hiemalis
Cellulase and pectinase are degrading cellulosic and pectic substances that form plant
cell walls and, thereby, they have a wide range of applications in the agro-industrial by-products
recycling and food industries. In the current research, Mucor circinelloides and M. hiemalis strains
were tested for their ability to produce cellulase and pectinase from tangerine peel by submerged
fermentation. Experiments on five variables: temperature, pH, incubation period, inoculum size,
and substrate concentration, were designed with a Box–Behnken design, as well as response
surface methodology (RSM), and analysis of variance was performed. In addition, cellulase and
pectinase were partially purified and characterized. At their optimum parameters, M. circinelloides
and M. hiemalis afforded high cellulase production (37.20 U/mL and 33.82 U/mL, respectively) and
pectinase (38.02 U/mL and 39.76 U/mL, respectively). The partial purification of M. circinelloides
and M. hiemalis cellulase produced 1.73- and 2.03-fold purification with 31.12 and 32.02% recovery,
respectively; meanwhile, 1.74- and 1.99-fold purification with 31.26 and 31.51% recovery,
respectively, were obtained for pectinase. Partially purified cellulase and pectinase from M.
circinelloides and M. hiemalis demonstrated the highest activity at neutral pH, and 70 and 50 °C, for
cellulase and 50 and 60 °C, for pectinase, respectively. Moreover, 10 mM of K+ increased M.
circinelloides enzymatic activity. The production of cellulase and pectinase from M. circinelloides
and M. hiemalis utilizing RSM is deemed profitable for the decomposition of agro-industrial wastes.
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Cellulase and pectinase are degrading cellulosic and pectic substances that form plant
cell walls and, thereby, they have a wide range of applications in the agro-industrial by-products…