Biochemical conversion of sugarcane straw hemicellulosic hydrolyzate supplemented with co-substrates for xylitol production

• Autor(a) principal: Hernandez-Perez, A. F.
• Data de Publicação: 2016
• Outros Autores: Costa, I. A. L., Silva, D. D. V., Dussan, K. J., Villela, T. R., Canettieri, E. V. [UNESP], Carvalho, J. A. [UNESP], Soares Neto, T. G., Felipe, M. G. A.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.biortech.2015.11.036; http://hdl.handle.net/11449/158616
• topic: Sugarcane straw; Hemicellulosic hydrolyzate; Xylitol; Co-substrates; Candida guilliermondii

Biotechnological production of xylitol is an attractive route to add value to a sugarcane biorefinery, through utilization of the hemicellulosic fraction of sugarcane straw, whose availability is increasing in Brazil. Herein, supplementation of the sugarcane straw hemicellulosic hydrolyzate (xylose 57 g L-1) with maltose, sucrose, cellobiose or glycerol was proposed, and their effect as co-substrates on xylitol production by Candida guilliermondii FTI 20037 was studied. Sucrose (10 g L-1) and glycerol (0.7 g L-1) supplementation led to significant increase of 8.88% and 6.86% on xylose uptake rate (1.11 g L-1 h(-1) and 1.09 g L-1), respectively, but only with sucrose, significant increments of 12.88% and 8.69% on final xylitol concentration (36.11 g L-1) and volumetric productivity (0.75 g L-1 h(-1)), respectively, were achieved. Based on these results, utilization of complex sources of sucrose, derived from agro-industries, as nutritional supplementation for xylitol production can be proposed as a strategy for improving the yeast performance and reducing the cost of this bioprocess by replacing more expensive nutrients. (C) 2015 Elsevier Ltd. All rights reserved.