Sugar-cane molasses fermentation by Zymomonas mobilis
1990
Doelle, M.B. | Doelle, H.W.
Two different quality types of sugar-cane molasses containing a total sugar content of 48%-50% (w/v) and 35%-42% (w/v) were investigated for Zymomonas bioethanol production. Molasses concentrations of up to 250 g/l (1:3 dilution) were successfully fermented within 24 h despite a higher salt concentration in the lower grade molasses. Higher molasses concentrations (300 g/1) led to fructose accumulation. The addition of sucrose to a final sugar concentration of 15% (w/v) led to 10% (v/v) ethanol with conversion efficiencies up to 96%. Sorbitol levels were negligible, but increased up to tenfold upon addition of invertase.
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