title: Production of cellulosic ethanol from cotton processing residues after pretreatment with dilute sodium hydroxide and enzymatic hydrolysis.
abstract: In this study, production of cellulosic ethanol from two cotton processing residues was investigated after pretreatment with dilute sodium hydroxide. Pretreatment performance was investigated using a 2(2) factorial design and the highest glucan conversion was achieved at the most severe alkaline conditions (0.4g NaOH g(-1) of dry biomass and 120°C), reaching 51.6% and 38.8% for cotton gin waste (CGW) and cotton gin dust (CGD), respectively. The susceptibility of pretreated substrates to enzymatic hydrolysis was also investigated and the best condition was achieved at the lowest total solids (5wt%) and the highest enzyme loading (85mg of Cellic CTec2 g(-1) of dry substrate). However, the highest concentration of fermentable sugars - 47.8 and 42.5gL(-1) for CGD and CGW, respectively - was obtained at 15wt% total solids using this same enzyme loading. Substrate hydrolysates had no inhibitory effects on the fermenting microorganism.
authors.affiliation: Research Center in Applied Chemistry (CEPESQ), Department of Chemistry, Federal University of Paraná, P.O. Box 19032, Curitiba, Paraná 81531-980, Brazil.
authors.forename: Douglas Henrique
authors.initials: DH
authors.lastname: Fockink
authors.affiliation: Research Center in Applied Chemistry (CEPESQ), Department of Chemistry, Federal University of Paraná, P.O. Box 19032, Curitiba, Paraná 81531-980, Brazil.
authors.forename: Marcelo Adriano Corrêa
authors.initials: MAC
authors.lastname: Maceno
authors.affiliation: Research Center in Applied Chemistry (CEPESQ), Department of Chemistry, Federal University of Paraná, P.O. Box 19032, Curitiba, Paraná 81531-980, Brazil; INCT Energy & Environment (INCT E&A), Department of Chemistry, Federal University of Paraná, Brazil. Electronic address: luiz.ramos@ufpr.br.
authors.forename: Luiz Pereira
authors.initials: LP
authors.lastname: Ramos
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D003246:Conservation of Energy Resources / Q000379:methods; D032561:Cotton Fiber; D000431:Ethanol / Q000138:chemical synthesis* / Q000302:isolation & purification; D003368:Gossypium / Q000737:chemistry*; D006868:Hydrolysis; D007220:Industrial Waste / Q000517:prevention & control*; D012972:Sodium Hydroxide / Q000737:chemistry*
chemical_list: D007220:Industrial Waste; D000431:Ethanol; D012972:Sodium Hydroxide; D002482:Cellulose
keywords: Alkaline pretreatment; Cotton gin dust; Cotton gin waste; Enzymatic hydrolysis; Fermentation