Recovery and Recycling of cellulase using a functional biopolymer

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Enzymatic hydrolysis of cellulosic biomass by cellulase has been receiving attention. In this study, recovery and recycling of cellulase were proposed using a functional lignin-based phenolic polymer "lignophenol" as an adsorption carrier. Cellulase was easily immobilized on lignophenol simply by mixing to give water-insoluble cellulase-lignophenol complex. Adsorption capacity of lignophenol from softwood was higher than that from hardwood. The presence of glucose did not change the adsorption capacity. Control of pH and salt concentration did not work effectively for desorption of the cellulase. Precipitation separation of cellulase with organic solvents was possible, but the reuse seemed difficult because of limited solubility to water. Cellulase-lignophenol complex was available as an immobilized cellulase with 20-60% of enzymatic activity of native cellulase with wider optimum pH range.