environments
have been the subject of considerable studies [25].
Table 1 showed that S. cerevisiae has consumed more than
90% sugars after 72 h of fermentation for 174.0 ± 0.2 kg m3
sugar content. With Z. rouxii, and C. pelliculosa, the sugar
consumption yield reached 67 and 71% respectively (Table 1);
in close relation with sugar consumption, the highest ethanol
yield was obtained for S cerevisiae (38% e Table 1), as well as
maximum ethanol productivity (0.9 ± 0.1 kg m3 h1 e Table
1). Contrarily, at high initial substrate concentration
(358.0 ± 1.0 kg m3), in close link with the inhibitory effect on
C. pelliculosa and S cerevisiae growth, there was an almost total
absence of substrate utilization, and hence no metabolites
released (Table 1); while the productivity of the last strain, the
osmotolerant Z. rouxii, increased significantly from 0.5 ± 0.1 to
0.8 ± 0.1 kgm3 h1 for an increase of the initial sugar content
from 174.0 ± 0.2 to 358.0 ± 1.0 kg m3 (Table 1).