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Abstract
An extracellular cellulase produced by marine bacterium Pseudoalteromonas sp. was studied for its activity and stability in six different ionic liquids (ILs) over a wide range of concentrations (1-20% v/v) and compared with aqueous medium as control. Enzyme showed its optimal activity at 45°C and at pH 5 in control. Although the activity varied with the type of IL and its concentration used, the activity measured at 5% (v/v) was maximum with [EMIM]Br followed by [EMIM]Ac, [BMIM]Cl, [CMIM][CHSO], [BMIM][OTF] and [BMPL][OTF] with 115%, 104.7%, 102.2%, 98.33%, 93.84% and 92.67%, respectively, and >80% activity at 15% (v/v) in all ILs. The enzyme stability at 5% (v/v) IL concentration for 36h was superior to commercial cellulase. The cellulase activity enhanced by 1.35- to 1.72-fold over control when 5% (v/v) IL based reaction medium with algal biomass was used and thus showed potentials for saccharification of biomass in a single step process.
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Concepts
PH, Ionic liquids, Chemical equilibrium, Photosynthesis, Concentration, Algae, Ionic liquid, Brown algae
MeSH headings
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