1. Physiological evaluation of yeast strains under anaerobic conditions using glucose, fructose, or sucrose as the carbon source.
- Author
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Andrade Silva, Cinthia Aparecida de, Oka, Marta Ligia, da Silva, Pedro Garcia Pereira, Honma, Janaina Mayumi, Leite, Rodrigo Simões Ribeiro, and Fonseca, Gustavo Graciano
- Subjects
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ETHANOL , *FRUCTOSE , *SUCROSE , *ORGANIC acids , *YEAST , *GLUCOSE - Abstract
The aim of this study was to evaluate the physiology of 13 yeast strains by assessing their kinetic parameters under anaerobic conditions. They included Saccharomyces cerevisiae CAT-1 and 12 isolated yeasts from different regions in Brazil. The study aimed to enhance understanding of the metabolism of these strains for more effective applications. Measurements included quantification of sugars, ethanol, glycerol, and organic acids. Various kinetic parameters were analyzed, such as specific substrate utilization rate (q S), maximum specific growth rate (μ max), doubling time, biomass yield, product yield, maximum cell concentration, ethanol productivity (P Eth), biomass productivity, and CO 2 concentration. S. cerevisiae CAT-1 exhibited the highest values in glucose for μ max (0.35 h−1), q S (3.06 h−1), and P Eth (0.69 gEth L−1 h−1). Candida parapsilosis Recol 37 did not fully consume the substrate. In fructose, S. cerevisiae CAT-1 stood out with higher values for μ max (0.25 h−1), q S (2.24 h−1), and P Eth (0.60 gEth L−1 h−1). Meyerozyma guilliermondii Recol 09 and C. parapsilosis Recol 37 had prolonged fermentation times and residual substrate. In sucrose, only S. cerevisiae CAT-1, S. cerevisiae BB9, and Pichia kudriavzevii Recol 39 consumed all the substrate, displaying higher P Eth (0.72, 0.51, and 0.44 gEth L−1 h−1, respectively) compared to other carbon sources. [Display omitted] • The physiology of 13 yeasts was investigated under anaerobic conditions using glucose, fructose, or sucrose. • Saccharomyces cerevisiae CAT-1 showed the higher fermentation capacity and rapid substrate consumption. • Candida glabrata Recol 43 also exhibited favourable metabolic traits and high ethanol productivity. • Only S. cerevisiae CAT-1, S. cerevisiae BB9, and Pichia kudriavzevii Recol 39 consumed all the sucrose. • All yeast strains exhibited higher ethanol yields when using fructose as a substrate. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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