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Fermentation of hexoses and pentoses from sugarcane bagasse hydrolysates into ethanol by Spathaspora hagerdaliae

Author:
Rech, Fernanda Roberta, Fontana, Roselei Claudete, Rosa, Carlos A., Camassola, Marli, Ayub, Marco Antônio Záchia, Dillon, Aldo J. P.
Source:
Bioprocess and biosystems engineering 2019 v.42 no.1 pp. 83-92
ISSN:
1615-7591
Subject:
bioreactors, ethanol, fermentation, glucose, hexoses, hydrolysates, inoculum, pH, pentoses, sugarcane bagasse, xylitol, xylose, yeasts
Abstract:
The present study evaluated 13 strains of yeast for ethanol and xylitol production from xylose. Among them, Spathaspora hagerdaliae UFMG-CM-Y303 produced ethanol yields (YP/S) of 0.25 g g⁻ ¹ and 0.39 g g⁻ ¹ under aerobic and microaerophilic conditions, respectively, from a mixture of glucose and xylose in flasks. A pH of 5.0 and an inoculum of 3.0 × 10⁸ cells mL⁻ ¹r resulted in the highest ethanol yields. These conditions were tested in a bioreactor for fermenting a medium containing an enzymatic hydrolysate of sugarcane bagasse with 15.5 g L⁻ ¹ of glucose and 3 g L⁻ ¹ of xylose, and achieved a YP/S of 0.47 g g⁻ ¹, in relation to total available sugar. These results suggest that S. hagerdaliae UFMG-CM-Y303 has potential for use in second-generation ethanol studies.
Agid:
6272829