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Response surface methodology was used for process optimization to covalently immobilize xylanase on the surface of glutaraldehyde–alginate beads. The process, optimized with respect to minimum ‘enzyme load’, had an efficiency of >91%. An increase in K m (from 0.9 to 1.49%), V max (from 7092 to 8000IU/ml), optimum pH (from 5 to 5.5) and temperature (from 40 to 45°C) was recorded...
An extracellular xylanase was purified from Aspergillus niger DFR-5 up to absolute homogeneity using (NH 4 ) 2 SO 4 fractionation (30–65%), size exclusion (Sephadex G-100) and ion-exchange (DEAE-cellulose) chromatography. The preparation yielded a single peak in RP-HPLC confirming its purity. Molecular mass of xylanase as revealed by gel filtration and SDS-PAGE was ∼32kDa confirming...
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