3. Results and discussion
3.1. Isolation and selection of yeasts
The ability to grow and produced ethanol was evaluated in 29
yeast strains isolated from both sugarcane molasses (17 strains) and
grapes (12 strains) using YPS fermentation media, starting with an
initial inoculum concentration of 0.5 g/L.Table 1shows the origin of
isolates, appearance of colonies, and the final ethanol concentration. Results showed that 13 strains produced reasonable amounts
of ethanol oscillating between 5 and 13%. The most outstanding
results were achieved with strains A2 (12.87%), A10 (13.20%) and
A11 (13.20%); all of them isolated from sugarcane molasses.Fig. 1h