title: Optimization of pretreatment and fermentation conditions for production of extracellular cellulase complex using sugarcane bagasse.
abstract: Sugarcane bagasse (SCB), a lignocellulosic byproduct of juice extraction from sugarcane, is rich in cellulose (40-42%). This could be used as a substrate for the production of cellulase complex. Fermentation conditions were optimized for production of cellulase complex (CMCase, Cellulobiase and FPase) by wild type Trichoderma sp. using sugarcane bagasse as sole carbon source. Alkaline treatment (2% NaOH) of bagasse (AlSCB) was found suitable for the production of reducing sugar over the acidic pretreatment method. After 5 days of incubation period, 5% substrate concentration at pH 5.0 and 400C resulted in maximum production of CMCase (0.622 U), while maximum (3.388 U) production of cellulobiase was obtained at 300C. The CMCase was precipitated and purified to the extent of 59.06 fold by affinity chromatography with 49.09% recovery. On 12% SDS-PAGE, a single band corresponding to 33 kDa was observed. The Km and Vmax for CMCase from Trichoderma was found 507.04 mg/ml and 65.32 mM/min, respectively. The enzyme exhibited maximum activity at 300C at pH-5.0 (0.363 U) and was stable over range of 20-60°C and pH 5.0-7.5.
authors.affiliation: Department of Biotechnology, Integral University, Dasauli, Kursi Road, Lucknow 226 026, Uttar Pradesh, India ; Indian Institute of Sugarcane Research, Raibareli Road, P.O. Dilkusha, Lucknow - 226 002, Uttar Pradesh, India.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Ashfaque
authors.affiliation: Indian Institute of Sugarcane Research, Raibareli Road, P.O. Dilkusha, Lucknow - 226 002, Uttar Pradesh, India.
authors.forename: Sushil
authors.initials: S
authors.lastname: Solomon
authors.affiliation: Department of Biotechnology, Integral University, Dasauli, Kursi Road, Lucknow 226 026, Uttar Pradesh, India.
authors.forename: Neelam
authors.initials: N
authors.lastname: Pathak