The results of this work show that SSF of switchgrass by S. cerevisiae
D5A at 37 C outperformed all of the K. marxianus IMB strains,
except IMB 3, at 45 C in terms of ethanol yield. However, when the
initial pH of the SSF buffer was 4.8 instead of 5.5, the final ethanol
yield by S. cerevisiae D5A was only 79% MTY (Suryawati et al.,
2008), compared to 92% MTY in this study. Suryawati et al.
(2008) also found that increasing the initial buffer pH from 4.8 to
5.5 for SSFs with IMB 4 at 45 C the increased 168 h ethanol yield
from 69% to 79% MTY, which was same 168 h yield produced by S.
cerevisiae D5A with buffer pH 4.8. However, IMB 4 produced this
yield 72 h earlier than S. cerevisiae D5A.