A review of convertion of cellulose from saw-dust to glucose

Abstract

From the reviewed work, Wood saw dust (WSD) after lignocellulosic saccharification by different hydrolysis methods is more efficient for glucose production as, its contains cellulose and hemicellulose at higher levels 5.52±0.05 % (w/v) and 0.990±0.001% (w/v), respectively. Cellulose and hemicellulose account for about a quarter of whole biomass in all land plants. A pretreatment method using chemicalhydrolysis and enzymatic conversion from starch into fermentable sugars was investigated by Joung Woo Han, (2005). The WSD was hydrolyzed at1.69 g/l, using a crude culture filtrate Aspergillus fumigatus at pH 5.0 and 30ºC in acetate buffer 50 mM, while 23.3 g/l was with 1 N sulfuric acid (H2SO4) treatment. Aonla pomace waste was used as substitute to acid because of high acidic nature. Optimum conditions for lignocellulosic saccharification was discussed in this work. Megersa, S., & Feleke, S. (2020). Also carried out combined pretreatments of steam and mild NaOH with white rot fungi (WRF) on sawdust samples from Eucalyptus globulus and Cupressus lusitanica were investigated. Samples of the pretreated sawdust samples were then subjected to the enzymes from the hydrolytic wood rot fungi for hydrolysis into fermentable sugars after measuring. It was observed that lignin, cellulose and hemicellulose losses of the two sawdust types increased with the increasing incubation days but lignin and hemicellulose were preferentially degraded than cellulose. Sugar yield obtained from the sawdust pretreated in the combination of NaOH with WRF and steam with WRF was significantly higher compared to the yield obtained from the NaOH and steam alone. It was also reviewed thatThree top, but with no significant differences (P≤0.005), sugar yields of 7.78 g/l, 7.54 g/l and 7.51 g/l were obtained.