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Lookup NU author(s): Dr Sharon Velasquez OrtaORCiD
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© 2021, The Author(s).Background: Wild-type yeasts have been successfully used to obtain food products, yet their full potential as fermenting microorganisms for large-scale ethanol fuel production has to be determined. In this study, wild-type ethanologenic yeasts isolated from a secondary effluent were assessed for their capability to ferment saccharified microalgae sugars. Results: Yeast species in wastewater were identified sequencing the Internal Transcribed Spacers 1 and 2 regions of the ribosomal cluster. Concurrently, microalgae biomass sugars were saccharified via acid hydrolysis, producing 5.0 ± 0.3 g L−1 of fermentable sugars. Glucose consumption and ethanol production of yeasts in hydrolyzed-microalgae liquor were tested at different initial sugar concentrations and fermentation time. The predominant ethanologenic yeast species was identified as Candida sp., and glucose consumption for this strain and S. cerevisiae achieved 75% and 87% of the initial concentration at optimal conditions, respectively. Relatively similar ethanol yields were determined for both species, achieving 0.45 ± 0.05 (S. cerevisiae) and 0.46 ± 0.05 g ethanol per g glucose (Candida sp.). Conclusion: Overall, the results provide a first insight of the fermentation capacities of specific wild-type Candida species, and their potential role in ethanol industries seeking to improve their cost-efficiency. [Figure not available: see fulltext.]
Author(s): Romero-Frasca E, Velasquez-Orta SB, Escobar-Sanchez V, Tinoco-Valencia R, Orta Ledesma MT
Publication type: Article
Publication status: Published
Journal: Biotechnology for Biofuels
Year: 2021
Volume: 14
Issue: 1
Online publication date: 09/04/2021
Acceptance date: 07/03/2021
Date deposited: 26/04/2021
ISSN (print): 1754-6834
ISSN (electronic): 1754-6834
Publisher: BioMed Central Ltd
URL: https://doi.org/10.1186/s13068-021-01925-x
DOI: 10.1186/s13068-021-01925-x
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