Autre 45++ Alkali Pretreatment Of Lignocellulosic Biomass. Composition of various lignocellulosic biomass. The pretreatment of any lignocellulosic biomass is cmcial before enzymatic hydrolysis. Acidic pretreatments are known to be effective with lignocellulosic biomasses in reducing the hemicellulose content. The objective of pretreatment is to decrease the crystallinity this process converts hemicellulose to pentose sugar as well as removes alkali. Alkali Pretreatment Of Lignocellulosic Biomass - Frontiers Recent Trends In The Pretreatment Of Lignocellulosic Biomass For Value Added Products Energy Research It is composed of carbohydrate polymers (cellulose, hemicellulose), and an aromatic polymer (lignin).