Abstract
Glucose dehydrogenase (GDH) from Bacillus megaterium was immobilized using aminopropyl controlled-pore silica (CPS, average pore sizes of 170 and 500 Å) as a support and glutaraldehyde as a bifunctional crosslinking agent. The CPS-immobilized enzyme could be reused 12 times and the best results were obtained using aminopropyl CPS-500 and bovine serum albumin as a feeder for stabilizing the protein layer on the support. DEAE-Sephadex (A-25 and A-50) was also used as a support for immobilizing GDH, with yields of around 42% for A-25 and 25–30% for A-50. The effect of pH on the immobilization procedure showed pH 6.5 to be better than pH 7.5 with respect to the recovery of enzyme activity. Both preparations of DEAE-Sephadex immobilized GDH could be reused several times and were thermostable at 40°C for 7 h. The kinetic parameters as Michaelis constant and maximum rate were determined for the immobilized enzyme and compared with those for the freeform.
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© 1997 Humana Press Inc.
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Fontana, J.D., Guimarães, M.F., Woodward, J., Baron, M. (1997). Stabilization and Reutilization of Bacillus megaterium Glucose Dehydrogenase by Immobilization. In: Davison, B.H., Wyman, C.E., Finkelstein, M. (eds) Biotechnology for Fuels and Chemicals. Applied Biochemistry and Biotechnology, vol 63-65. Humana Press. https://doi.org/10.1007/978-1-4612-2312-2_23
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DOI: https://doi.org/10.1007/978-1-4612-2312-2_23
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