Use of dry yeast biomass as a new approach for detoxification of hemicellulosic hydrolysates aiming to xylitol production

Author(s)

Jofre, Fanny Machado ^[1] ; Hernandez-Perez, Andres Felipe ^[1] ; dos Santos, Julio Cesar ^[1] ; de Almeida Felipe, Maria das Gracas ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Biotechnol, Engn Sch Lorena EEL, BR-12602810 Lorena, SP - Brazil

• Document type: Journal article
• Source: INDUSTRIAL CROPS AND PRODUCTS; v. 170, OCT 15 2021.
• Web of Science Citations: 0

Abstract

The presence of toxic compounds in hemicellulosic hydrolysates is a bottleneck for biotechnological processes, such as xylitol production. In our work, a new approach was proposed for hemicellulosic hydrolysates detoxification by using the residual dry yeast biomass (DYB) from xylitol production bioprocess. Candida tropicalis biomass was recovered from fermentation process of a medium based on sugarcane bagasse and straw hemicellulosic hydrolysate (SBSH). The effects of influent variables on detoxification performance were investigated, and the removal of phenolic compounds, acetic acid, furfural and 5-hydroxymethylfurfural reached up to, respectively, 27.0 %, 26.7 %, 27.5 %, and 25.8 %. By using the SBSH detoxified at conditions of highest phenolics removal, fermentations (initial xylose concentration of 52 g L-1) were performed for xylitol production, resulting in a yield of 0.79 gg-1 and 86 % of conversion efficiency. Thus, the use of residual DYB is a potential alternative for detoxification of hemicellulosic hydrolysates, since recycling the biomass could reduce the expenditures with adsorbents. (AU)

• FAPESP's process: 19/27092-9 - Xylitol-producing biorefinery from sugarcane: new strategies to make the biotechnological route viable
• Grantee: Maria das Graças de Almeida Felipe
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants