An enzyme reactor installed with ultrafiltration membrane was developed to produce alpha-, beta-, and gamma-cyclodextrins (CDs) from soluble starch by Bacillus macerans cyclodextrin glycosyltransferase (CGTase) tagged with 10 lysines at its C-terminus (CGTK10ase). Ultrafiltration membrane YM10 with 10,000 of molecular cutoff was chosen for membrane modification and CD production. A repeated-batch type of the enzyme reaction with free CGTK10ase resulted in a alpha-CD yield of 24.0 (+/-1.5)% and a productivity of 4.68 (+/-0.88) g/l-h, which were 7 times higher that those for CGTK10ase immobilized on modified YM10 membrane. Addition of 1- nonanol increased CD yields by 30% relative to the control, which might be due to prevention of the reversible hydrolysis of CDs.
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