Effect of Two Mild Alkaline Oxidative Pretreaments of Rice Straw on Enzymatic Hydrolysis

Abstract

Two mild alkaline oxidative pretreatments of rice straw followed by enzymatic hydrolysis were investigated. In addition to measuring the composition variance, the pretreated rice straw solutions were analysed by the UV/Vis spectra. These two mild oxidative pretreatment of rice straw cause the removal of lignin, hemicellulose and neutral detergent solubles (NDS), where the H2O2/NaOH pretreatment solubilize the lignin and the O3/NaOH pretreatment oxidative degrade the lignin. These two mild oxidative pretreatment of rice straw enhance susceptibility to enzymatic hydrolysis, and speed-up the enzymatic hydrolysis. The conversion yield of cellulose and hemicellulose presented in the O3/NaOH pretreated rice straw was 92.6%, compared to 82.3% and 52.5% in the H2O2/NaOH pretreated and untreated rice straw, respectively.