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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 8
Affiliation:
[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
Total Affiliations: 4
Document type: Journal article
Source: Biotechnology Letters; v. 41, n. 6-7, p. 753-761, JUL 2019.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 16/06142-0 - Strategies to improve the performance of the second generation ethanol production process
Grantee:Aline Carvalho da Costa
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants