Bagaço de cana-de-açúcar como fonte de glicose: pré-tratamento corona

Abstract

Lignocellulosic materials have a complex polymeric structure, so, to obtain a high yield of glucose by hydrolysis reactions is necessary a pretreatment of the material. In this work, the effect of pretreatment corona (electric discharge) on different properties in three lignocellulosic materials (microcrystalline cellulose, cellulose pulp and bagasse) was evaluated. corona treatment was applied in three different exposure times (2, 6 and 10 minutes). Crystallinity, obtained by X-ray diffraction, showed a significant increase in samples of bagasse after pretreatment. No changes in acidity of materials was observed. Cationic and anionic tests indicate that the surface of bagasse is negatively charged after pretreatment. Amount of methylene blue adsorbed in the materials decreased with increasing of exposure time. Acid hydrolysis of materials with and without pretreatment were evaluated in amount of total reducing sugars (%TRS). A small decrease in %TRS occurred after pretreatment corona mainly in bagasse samples. HPLC analysis of hydrolysis products of pretreated bagasse showed higher yields in glucose, a raw material of interest for second generation ethanol.