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Continuous simultaneous saccharification and fermentation of starch using Zymomonas mobilis

A continuous process involving simultaneous saccharification and fermentation of liquefied starch has been developed using Zymomonas mobilis. Amyloglucosidase retention and cell recycle have been effected by using an Amicon hollow‐fiber membrane system with a MW cutoff of 5000. Relatively high productivities of up to 60 g L−1 h−1 have been achieved at ethanol concentrations of 60–65 g/L. The system also offers the potential for reduced enzyme requirements for saccharification.