Thermotolerant yeasts capable of producing bioethanol: isolation from natural fermented sources, identification and characterization

Isolation and characterization of thermotolerant yeasts for the production of second-generation bioethanol

“…The enrichment culture technique has been widely used to isolate useful thermotolerant yeasts for high-temperature ethanol fermentation (Limtong et al 2007;Yuangsaard et al 2013;Keo-oudone et al 2016;Talukder et al 2016;Choi et al 2017;Chamnipa et al 2018). Using this technique, diverse thermotolerant yeasts were successfully isolated from soil samples collected in the Mekong Delta, Vietnam.…”

“…Several studies have reported the isolation of thermotolerant yeasts from soil samples and obtained several high potential thermotolerant yeasts for high-temperature ethanol fermentation, e.g., P. kudriavzevii PBB511-1 (Kaewkrajay et al 2014), S. cerevisiae DBKKUY-53 (Nuanpeng et al 2016), and P. kudriavzevii RZ8-1 (Chamnipa et al 2018). Although several thermotolerant yeasts have been identified from other sources, e.g., natural fermented products (Talukder et al 2016), fruits (Keo-oudone et al 2016), and nuruk (a traditional Korean fermentation starter) (Choi et al 2017), the present study demonstrated that soil is superior to other sources for isolating thermotolerant yeasts for ethanol production at high temperatures.…”

Optimization of Acetic Acid Production Rate by Thermotolerant <i>Acetobacter</i> spp.

“…Thermotolerant microorganisms could grow well in medium temperatures ranging from 37˚C to 50˚C [13]. The growth was monitored by Spectrophotometer at 600 nm.…”

Matrices (re)loaded: Durability, viability, and fermentative capacity of yeast encapsulated in beads of different composition during long‐term fed‐batch culture

“…,105 Thus, a more thermotolerant yeast could improve the efficiency of this step 106,107. Moreover, since cooling costs for fermentation tanks can be costly in the summer, especially in warmer regions, 108 a more thermotolerant yeast could also help reduce cooling costs, and is thus doubly favored.…”

“…,107 Moreover, since cooling costs for fermentation tanks can be costly in the summer, especially in warmer regions, 108 a more thermotolerant yeast could also help reduce cooling costs, and is thus doubly favored. Indeed, recent analyses suggest that for every 5 C increase in the fermentation temperature, in today's market approximately $30,000 per year could be saved for a 30,000 kl scale ethanol plant, not including reductions in initial investment costs 109.…”