S. cerevisiae yeasts, capable of fermenting at 40 and 45 ◦C,
have been obtained using progressive cultures [9,19]. Additionally,
thermotolerant yeasts have been obtained by selecting survivors
after a shock process at relatively high temperatures. El Sheikh
Idris and Berry [20] demonstrated that 15 min of incubation
at 55 ◦C resulted in yeasts tolerant to higher temperature than
non-incubated controls.
The objective of this work was to select S. cerevisiae strains
capable of fermenting glucose at temperatures above 35 ◦C with