Impact of Sugar and Furfural Production from Cassava Residue of Hot Water Pretreatment

Hot water pretreatment, as an alternative use of lignocellulosic biomass to produce fermentable sugar, was performed in this study. Cassava residue was treated at elevated temperatures (150, 160, 170, and 180 degrees C) and for various amounts of time (20-70 min). The hemicellulose degradation (yields of glucose and xylose, as well as inhibitors) and chemical composition, as well as structural features were investigated by high performance liquid chromatography, Fourier transform infrared spectroscopy, and nuclear magnetic resonance studies, respectively. The results indicated that sugar in the hydrolysate was in oligomeric form and that the maximum glucose yields (0.211 g/ L glucose and 22.405 g/ L gluco-oligosaccharides) in the prehydrolysate liquid were obtained at 170 degrees C and 40 min. The cassava residue hemicellulosic fractions were composed of (1 -> 4)-beta-D, xylopyranosyl backbones, and the side chains were arabinose and 4-O-MeGlcA.