In most of the distilleries in Mexico, the yield of ethanol
from molasses ranged from 0.33 up to 0.38 g ethanol/g
reducing sugars (Olguin et al., 1995). In another study
(Morimura et al., 1997), a thermotolerant Xocculating yeast
S. cerevisiae strain KF-7 resulted in stable ethanol production
with ethanol productivity ranging from 3.5 g/l/h at
33 °C to 2.7 g/l/h at 35 °C. In the case of fermentation of
molasses of 10 and 12 °Be initial density (156 and 187 g of
initial sugar/l) by immobilized biocatalyst BSG1 at 30 °C,
the mean ethanol productivities were 2.5 and 2.7 g/l/h and
the yields 0.35 and 0.34, respectively which are considered
as acceptable values.