Differential effects of major inhibitory compounds from sugarcane-based lignocellulosic hydrolysates on the physiology of yeast strains and lactic acid bacteria

Author(s)

Cola, Priscila ^[1] ; Procopio, Dielle Pierotti ^[1] ; Alves, Adriana Tabosa de Castro ^[1] ; Carnevalli, Luciana Rebelo ^[1] ; Sampaio, Icaro Viana ^[1] ; da Costa, Bruno Labate Vale ^[1] ; Basso, Thiago Olitta ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Chem Engn, Ave Prof Luciano Gualberto 380, BR-05508010 Sao Paulo - Brazil

• Document type: Journal article
• Source: Biotechnology Letters; v. 42, n. 4, p. 571-582, APR 2020.
• Web of Science Citations: 2

Abstract

Objectives Major lignocellulosic inhibitory compounds found in sugarcane-based industrial hydrolysate samples were tested in laboratory and industrial yeast strains, as well as in lactic acid bacteria, in order to verify their effects on important physiological parameters. Results Saccharomyces cereviaise SA-1, an industrial strain, stood out as compared to the remaining strains for virtually all inhibitors investigated. This strain presented the highest growth rate and the lowest lag-phase in the presence of acetic acid, levulinic acid, p-coumaric acid, ferulic acid, and HMF, when compared to the other strains. In sugarcane-based hydrolysate fermentations, both SA-1 and CEN.PK113-7D presented similar fermentation performances. Industrial isolates of contaminating lactic acid bacteria were evaluated in the presence of an inhibitory cocktail, containing a mixture of 76.6 mM acetic acid, 1.3 mM HMF, 7.1 mM furfural, and 1.9 mM p-coumaric acid. Whilst all yeast strains were unable to grow under such conditions, bacteria had an average inhibition of roughly 50% on their growth rates. Conclusions Overall, industrial strain SA-1 might be a promising microbial chassis for second generation ethanol production and for future metabolic and evolutionary engineering strategies, and for strain robustness understanding. (AU)

• FAPESP's process: 18/01759-4 - Metabolic engineering of Saccharomyces cerevisiae to produce second generation ethanol from xylooligosaccharides
• Grantee: Dielle Pierotti Procópio
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 15/50612-8 - An integrated approach to explore a novel paradigm for biofuel production from lignocellulosic feedstocks
• Grantee: Telma Teixeira Franco
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 18/17172-2 - How do fuel ethanol yeasts and contaminating lactic acid bacteria respond toward lignocellulosic-derived inhibitors?
• Grantee: Thiago Olitta Basso
• Support Opportunities: Regular Research Grants