Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8842561 | Brazilian Journal of Microbiology | 2018 | 7 Pages |
Abstract
For the implementation of cellulosic ethanol technology, the maximum use of lignocellulosic materials is important to increase efficiency and to reduce costs. In this context, appropriate use of the pentose released by hemicellulose hydrolysis could improve de economic viability of this process. Since the Saccharomyces cerevisiae is unable to ferment the pentose, the search for pentose-fermenting microorganisms could be an alternative. In this work, the isolation of yeast strains from decaying vegetal materials, flowers, fruits and insects and their application for assimilation and alcoholic fermentation of xylose were carried out. From a total of 30 isolated strains, 12 were able to assimilate 30 g Lâ1 of xylose in 120 h. The strain Candida tropicalis S4 produced 6 g Lâ1 of ethanol from 56 g Lâ1 of xylose, while the strain C. tropicalis E2 produced 22 g Lâ1 of xylitol. The strains Candida oleophila G10.1 and Metschnikowia koreensis G18 consumed significant amount of xylose in aerobic cultivation releasing non-identified metabolites. The different materials in environment were source for pentose-assimilating yeast with variable metabolic profile.
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Authors
Gisele Marta Martins, Daniela Alonso Bocchini-Martins, Carolina Bezzerra-Bussoli, Fernando Carlos Pagnocca, MaurÃcio Boscolo, Diego Alves Monteiro, Roberto da Silva, Eleni Gomes,