title: Alkaline hydrogen peroxide pretreatment of cashew apple bagasse for ethanol production: study of parameters.
abstract: The alkaline hydrogen peroxide (AHP) pretreatment of cashew apple bagasse (CAB) was evaluated based on the conversion of the resultant cellulose into glucose. The effects of the concentration of hydrogen peroxide at pH 11.5, the biomass loading and the pretreatment duration performed at 35°C and 250 rpm were evaluated after the subsequent enzymatic saccharification of the pretreated biomass using a commercial cellulase enzyme. The CAB used in this study contained 20.56 ± 2.19% cellulose, 10.17 ± 0.89% hemicellulose and 35.26 ± 0.90% lignin. The pretreatment resulted in a reduced lignin content in the residual solids. Increasing the H2O2 concentration (0-4.3% v/v) resulted in a higher rate of enzymatic hydrolysis. Lower biomass loadings gave higher glucose yields. In addition, no measurable furfural and hydroxymethyl furfural were produced in the liquid fraction during the pretreatment. The results show that alkaline hydrogen peroxide is effective for the pretreatment of CAB.
authors.affiliation: Universidade Federal do Ceará, Departamento de Engenharia Química, Campus do Pici, Bloco 709, 60455-760 Fortaleza, CE, Brazil.
authors.forename: Jessyca Aline da Costa
authors.initials: JA
authors.lastname: Correia
authors.forename: José Edvan Marques
authors.initials: JE
authors.lastname: Júnior
authors.forename: Luciana Rocha B
authors.initials: LR
authors.lastname: Gonçalves
authors.forename: Maria Valderez Ponte
authors.initials: MV
authors.lastname: Rocha
mesh_terms: D000468:Alkalies / Q000494:pharmacology*; D031021:Anacardium / Q000187:drug effects*; D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D002480:Cellulase / Q000378:metabolism; D002482:Cellulose / Q000378:metabolism*; D000431:Ethanol / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D008031:Lignin / Q000302:isolation & purification; D013997:Time Factors
chemical_list: D000468:Alkalies; D000431:Ethanol; D002482:Cellulose; D008031:Lignin; C027433:bagasse; D006861:Hydrogen Peroxide; D002480:Cellulase; D005947:Glucose