4. Conclusion
Soybean molasses proved to be a potential substrate for ethanol
production with S. cerevisiae in a batch bioreactor in the three cases
studied: fermentation of unmodified soybean molasses, enzymatic
hydrolysis and subsequent fermentation of SM and simultaneous
hydrolysis and fermentation of SM.
The soybean molasses hydrolyzed and fermented in sequence
had a 10.4% higher ethanol yield and a lower concentration of residual
sugar when compared to non-hydrolyzed soybean molasses.
The simultaneous hydrolysis and fermentation also gave a higher
yield than the SM not treated with enzyme (11.2%), along with a
lower concentration of residual sugar. The simultaneous process
required a total of 12 h, while the HF process required 14 h.
Acknowledgments
The authors wish to thank the CAPES, CNPq and FAPEMIG –
Brazil – for the financial support.
References