Otimização da hidrólise enzimática para produção de bioetanol por sacarificação e fermentação semi-simultâneas usando fibra de coco maduro

Autores

DOI:

https://doi.org/10.20873/jbb.uft.cemaf.v8n4.avelino

Palavras-chave:

Lichtheimia ramosa, extrato de enzima bruta, β-glucosidase, farelo de trigo, SSSF

Resumo

Substratos alternativos para produzir produtos químicos úteis, como biocombustível, têm sido atraentes, principalmente para a produção de etanol celulósico. Neste contexto, o objetivo deste trabalho foi otimizar a mistura sinérgica de enzimas de Trichoderma reesei e extrato de enzima bruta de Lichtheimia ramosa para a hidrólise da fibra de coco maduro pré-tratado com peróxido de hidrogênio alcalino (Alk-H2O2) - hidróxido de sódio (NaOH) e produção de bioetanol por Saccharomyces cerevisiae em estratégia de sacarificação e fermentação semi-simultânea (SSSF). Resultando nas conversões e rendimentos de fibra de coco maduro deslignificada em açúcares redutores entre 12,0-82,3% e 0,09-0,64 g de açúcares redutores/g de biomassa seca, respectivamente, com uma taxa de hidrólise inicial em 12 h entre 0,10-0,89 g/(Lh) . E as conversões e rendimentos de fibra de coco maduro deslignificado em glicose entre 10,4-83,9% e 0,06-0,43 g de glicose/g de biomassa seca, nessa ordem, com uma taxa de hidrólise inicial em 12 h entre 0,03-0,35 g/(L.h). A produção de bioetanol por S. cerevisiae utilizando fibra de coco maduro deslignificado, enzimas de T. reesei e extrato de enzima bruta de L. ramosa resultou na produção, rendimento e produtividade volumétrica de etanol de 4,62 g/L, 0,41 g de etanol/g de glicose e 0,13 g/(Lh), respectivamente. Os resultados mostraram efeitos sinérgicos entre as enzimas de T. reesei e extrato bruto de L. ramosa, além de não promover inibição na fermentação alcoólica. Portanto, permitindo formular uma preparação enzimática otimizada visando a produção de etanol celulósico.

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Publicado

11-10-2020

Como Citar

Gonçalves, F. A. ., Santos, E. S. dos, & Macedo, G. R. de. (2020). Otimização da hidrólise enzimática para produção de bioetanol por sacarificação e fermentação semi-simultâneas usando fibra de coco maduro. Journal of Biotechnology and Biodiversity, 8(4), 251–265. https://doi.org/10.20873/jbb.uft.cemaf.v8n4.avelino