Abstract
Cyclodextrin glucanotransferase (CGTase) fromThermoanaerobacter sp. was adsorbed on the ion exchange resin Amberlite IRA-900. The optimum conditions for the immobilization of the CGTase were pH 6.0 and 600 U CGTase/g resin, and the maximum yield of immobilization was around 63% on the basis of the amount ratio of the adsorbed enzyme to the initial amount in the solution. Immobilization of CGTase shifted the optimum temperature for the enzyme to produce transglycosylated xylitol from 70°C to 90°C and improved the thermal stability of immobilized CGTase, especially after the addition of soluble starch and calcium ions. Transglycosylated xylitol was continuously produced using immobilized CGTase in the column type packed bed reactor, and the operating conditions for maximum yield were 10% (w/v) dextrin (13 of the dextrose equivalent) as the glycosyl donor, 10% (w/v) xylitol as the glycosyl acceptor, 20 mL/h of medium flow rate, and 60°C. The maximum yield of transglycosylated xylitol and productivity were 25% and 7.82 g·L−1·h−1, respectively. The half-life of the immobilized CGTase in a column type packed bed reactor was longer than 30 days.
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Kim, PS., Shin, HD., Park, JK. et al. Immobilization of cyclodextrin glucanotransferase on amberlite IRA-900 for biosynthesis of transglycosylated xylitol. Biotechnol. Bioprocess Eng. 5, 174–180 (2000). https://doi.org/10.1007/BF02936590
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DOI: https://doi.org/10.1007/BF02936590