Novel and Tailor-Made Enzyme Cocktails for Saccharification of Cellulosic Biomass

Lignocellulosic biomass (LCB), such as agricultural residues and plant-based waste, holds tremendous potential as a renewable and sustainable source of biofuels and other valuable products. LCB is mainly composed of three components: cellulose, hemicellulose, and lignin. Cellulase is a mixture of three enzymes, which include endoglucanase, exoglucanase (cellobiohydrolase), and β-glucosidase, which work synergistically to deconstruct cellulose into glucose. It has been shown that the ratios of these three enzymes are required to achieve higher saccharification efficiency toward a particular lignocellulosic residue than the individual enzyme. Since this enzyme ratio is very specific to the composition of biomass and the pretreatment method utilized, it is termed a tailor-made enzyme cocktail. This approach provides efficient conversion of cellulose into fermentable sugar, glucose, and is a critical step in the bioconversion of glucose into biofuels and other value-added products. Advanced molecular techniques are employed to modify the cellulolytic enzyme properties such as substrate specificity, thermostability, and pH tolerance to optimize their performance on different biomass feedstocks under process conditions. This chapter has dealt with the importance of cellulolytic enzyme cocktails, the approaches used in their development, and the computational approaches used in their design. The role of additives that affect the performance of the cocktails has also been described. The contribution of these enzyme cocktails to the advancement of bioconversion technologies offers practical solutions for unlocking the potential of cellulosic biomass for biorefineries.