Fermentation of hexoses and pentoses from sugarcane bagasse hydrolysates into ethanol by Spathaspora hagerdaliae
The present study evaluated 13 strains of yeast for ethanol and xylitol production from xylose. Among them, Spathaspora hagerdaliae UFMG-CM-Y303 produced ethanol yields (YP/S) of 0.25 g g− 1 and 0.39 g g− 1 under aerobic and microaerophilic conditions, respectively, from a mixture of glucose and xylose in flasks. A pH of 5.0 and an inoculum of 3.0 × 108 cells mL− 1r resulted in the highest ethanol yields. These conditions were tested in a bioreactor for fermenting a medium containing an enzymatic hydrolysate of sugarcane bagasse with 15.5 g L− 1 of glucose and 3 g L− 1 of xylose, and achieved a YP/S of 0.47 g g− 1, in relation to total available sugar. These results suggest that S. hagerdaliae UFMG-CM-Y303 has potential for use in second-generation ethanol studies.
KeywordsLignocellulosic biomass Xylose Second-generation ethanol Biorefinery
The authors thank Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Universidade de Caxias do Sul (UCS) scholarship and structural support. This research was supported by grants from Fundação de Amparo a Pesquisa do Estado do Rio Grande do Sul FAPERGS (10/1972-5), Fundação de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (310177/2011-1).
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