Online monitoring of the redox potential in microaerobic and anaerobic Scheffersomyces stipitis fermentations

Autor(es)

Bonan, Carolina I. D. G. ^{[1, 2]} ; Biazi, Luiz E. ^{[1, 2]} ; Santos, Samantha C. ^[1] ; Soares, Lauren B. ^[3] ; Dionisio, Suzane R. ^[1] ; Hoffmam, Zaira B. ^[4] ; Costa, Aline C. ^[2] ; Ienczak, Jaciane L. ^[3]

Afiliação do(s) autor(es)

^[1] Brazilian Bioethanol Sci & Technol Lab CTBE CNPEM, 10000 Giuseppe Maximo Scolfaro St, BR-13083852 Campinas, SP - Brazil

^[2] State Univ Campinas UNICAMP, Sch Chem Engn, 500 Albert Einstein Av, BR-13083852 Campinas, SP - Brazil

^[3] Santa Catarina Fed Univ, Chem Engn & Food Engn Dept, BR-88040900 Florianopolis, SC - Brazil

^[4] INPI, Mayrink Veigan St 9, BR-20090910 Rio De Janeiro - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Biotechnology Letters; v. 41, n. 6-7, p. 753-761, JUL 2019.
• Citações Web of Science: 0

Resumo

ObjectiveA correlation among different volumetric oxygen transfer coefficients (k(L)a) 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.ResultsMicroaerophilic condition (k(L)a=4.9h(-1)) have shown to be suitable when compared to complete anaerobiosis (k(L)a=0), providing an ethanol yield and a productivity after 48h of 64.3% and 0.45g ethanol L-1 h(-1), respectively; the maximum ethanol titer obtained was 21.50g ethanol L-1. Values of ORP varying from -270 to -330mV resulted in high ethanol production from xylose by S. stipitis.ConclusionsDifferent ORP values were found in anaerobiosis and k(L)a 4.9h(-1), suggesting that for ethanol production by S. stipitis, values from -270 to -330mV 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 O-2 concentration. (AU)

• Processo FAPESP: 16/06142-0 - Estratégias para melhorar o desempenho do processo de produção de etanol de segunda geração
• Beneficiário: Aline Carvalho da Costa
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular