Ethanol production from each strain of S. cerevisiae at overliming
pH 10 is shown in Fig. 3c. The starting glucose concentration for
the fermentation process was 45 g/L. S. cerevisiae TISTR 5596 produced
the most ethanol at 16 g/L in 24 h. The same yeast strain also
produced the maximum ethanol production within 24 h in hydrolyzate
from sugarcane leaves (Jutakanoke et al., 2012). The amount
of ethanol produced correlates with the results from Srinorakutara
et al., where S. cerevisiae TISTR 5596’s ethanol production is superior
to that of S. cerevisiae TISTR 5606 (Srinorakutara et al., 2008).
The lower ethanol production of S. cerevisiae TISTR 5339 and
5606 could be due to their lower tolerance to osmotic stress, which
is supported by the yeast population and sugar consumption
results in Fig. 3a and b, respectively