Increased acetic acid removal from sugarcane bagasse hemicellulosic hydrolysate by the yeast Issatchenckia occidentalis Y1’a in absence of glucose / Aumento da remoção de ácido acético a partir do hidrolisado hemicelulósico do bagaço de cana-de-açúcar pela levedura Issatchenckia occidentalis Y1'a na ausência de glicose

Bruna Caroline Marques Gonçalves, Messias Borges Silva, Silvio Silvério da Silva

Abstract


Second generation ethanol is an attractive alternative to increase the worldwide ethanol production by utilizing agro-industrial waste crops. A pretreatment step is mandatory to expose sugars from vegetal biomass, which should be low cost and highly efficient. Even though dilute-acid pretreatment satisfies these prerequisites, metabolism inhibitors are generated during such process. In this study, I. occidentalis Y1’a was able to grow in no supplemented sugarcane bagasse hemicellulosic hydrolysate by using acetic acid as energy source. However acetic acid removal has been delayed in glucose-added medium. Given the fact that acetic acid is considered an inhibitor of microbial metabolism during ethanol production, this finding characterizes an efficient and low-cost hemicellulosic hydrolysate biodetoxification. Fermentation was successful with an ethanol yield (YP/S) of 0.26 g/g and volumetric ethanol productivity (Qp) of 0.14 g/L.h, indicating that dilute-acid pretreatment followed by biodetoxification and xylose fermentation by Candida shehatae UFMG52.2 are promising ways for 2G-bioethanol production.

 


Keywords


Second generation bioethanol, biodetoxification, box behnken design

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References


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DOI: https://doi.org/10.34117/bjdv6n4-145

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