Abstract
n-Butanol is a renewable resource with a wide range of applications. Its physicochemical properties make it a potential substitute for gasoline. Saccharomyces cerevisiae can produce n-butanol via amino acid catabolic pathways, but the use of pure amino acids is economically unfeasible for large-scale production. The aim of this study was to optimize the production of n-butanol by S. cerevisiae from protein-rich agro-industrial by-products (sunflower and poultry offal meals). By-products were characterized according to their total protein and free amino acid contents and subjected to enzymatic hydrolysis. Protein hydrolysates were used as nitrogen sources for the production of n-butanol by S. cerevisiae, but only poultry offal meal hydrolysate (POMH) afforded detectable levels of n-butanol. Under optimized conditions (carbon/nitrogen ratio of 2 and working volume of 60%), 59.94 mg/L of n-butanol was produced using POMH and glucose as substrates. The low-cost agro-industrial by-product showed great potential to be used in the production of n-butanol by S. cerevisiae. Other protein-rich residues may also find application in biofuel production by yeasts.
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Funding
The authors thank the São Paulo State Research Foundation (FAPESP) for the financial support (grants nos. 2015/50612-8, 2015/20630-4, 2016/04602-3 and 2019/08542-3) and Dr. Maria Teresa Bertoldo Pacheco from the Institute of Food Technology, Campinas, Brazil, for kindly providing the sunflower meal.
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Santos, B.A.S., Azambuja, S.P.H., Ávila, P.F. et al. n-Butanol production by Saccharomyces cerevisiae from protein-rich agro-industrial by-products. Braz J Microbiol 51, 1655–1664 (2020). https://doi.org/10.1007/s42770-020-00370-6
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DOI: https://doi.org/10.1007/s42770-020-00370-6