Avaliação da produção de etanol a partir da fibra do caju pré-tratada em microondas

• Autor(a) principal: Rodrigues, Tigressa Helena Soares
• Data de Publicação: 2009
• Outros Autores: Martins, Samuel Quintela Soares, Rocha, Maria Valderez Ponte, Gonçalves, Luciana Rocha Barros, Macedo, Gorete Ribeiro de
• Tipo de documento: Artigo de conferência
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/54860
• topic: Etanol; Bagaço de caju; Fermentação; Biocombustíveis; Biomassa - Energia

Nowadays, there is great interest in exploring alternative energy sources to maintain the sustainable growth of society. Cashew apple bagasse, lignocellulosic by-product in Brazil with no commercial value, is obtained from cashew apple process to juice production. In this work, the potential of microwave-assisted alkali pretreatment in order to improve the rupture of the recalcitrant structures of the cashew fiber is studied. Results showed that, after enzymatic hydrolysis, alkali concentration exerted influence on glucose formation, being the best result achieved after pretreatment with 1.0 mol.L-1 of NaOH (73 ± 8 mg.g-1 CAB-M) when 2% (w/v) of CAB-M was used. On enzymatic hydrolysis step, improvement on solid percentage (16 % w/v) and enzyme loading (30 FPU.gFTP -1) increased glucose concentration to 15 g.L-1. The fermentation of hydrolyzate by Saccharomyces cerevesiae resulted in ethanol concentration and productivity of 7.20 g.L-1, and 1.44 g.L-1.h-1, respectively. The results demonstrate that microwave-assisted alkali pretreatment is able to remove recalcitrant structures of CAB and to improve its enzymatic digestibility.