Online monitoring of the redox potential in microaerobic and anaerobic Scheffersomyces stipitis fermentations
ARTIGO
Inglês
Agradecimentos: The authors acknowledge the Brazilian Bioethanol Science and Technology Laboratory - CTBE/CNPEM. This study was funded by FAPESP (Grant Numbers 2016/06142-0 and 2017/049970)
Abstract: A correlation among different volumetric oxygen transfer coefficients (kLa) and the oxireduction potential (ORP) in batch fermentations using Scheffersomyces stipitis was evaluated. Experiments were performed using a mixture of xylose and glucose as the substrates.Microaerophilic condition...
Abstract: A correlation among different volumetric oxygen transfer coefficients (kLa) and the oxireduction potential (ORP) in batch fermentations using Scheffersomyces stipitis was evaluated. Experiments were performed using a mixture of xylose and glucose as the substrates.Microaerophilic condition (kLa = 4.9 h-1) have shown to be suitable when compared to complete anaerobiosis (kLa = 0), providing an ethanol yield and a productivity after 48 h of 64.3% and 0.45 g ethanol L-1 h-1, respectively; the maximum ethanol titer obtained was 21.50 g ethanol L-1. Values of ORP varying from - 270 to - 330 mV resulted in high ethanol production from xylose by S. stipitis. Different ORP values were found in anaerobiosis and kLa 4.9 h-1, suggesting that for ethanol production by S. stipitis, values from - 270 to - 330 mV are favorable under the studied circumstances. In this ORP range, the greatest rates of xylose consumption and ethanol production were registered. ORP monitoring was demonstrated to be a suitable option for online control throughout the fermentation processes, which may provide a more efficient bioprocess operation with a very low O2 concentration
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2016/06142-0; 2017/04997-0
Fechado
Online monitoring of the redox potential in microaerobic and anaerobic Scheffersomyces stipitis fermentations
Online monitoring of the redox potential in microaerobic and anaerobic Scheffersomyces stipitis fermentations
Fontes
Biotechnology letters Vol. 41, no. 6-7 (July, 2019), p. 753-761 |