Solute adsorption and enzyme immobilization on chitosan beads prepared from shrimp shell wastes
2001
Juang, R.S. | Wu, F.C. | Tseng, R.L.
The equilibrium and kinetics of adsorption of reactive dye RR222 and Cu(2+), and the activity of immobilization of acid phosphatase, on highly swollen chitosan beads were examined at 30 degrees C. The chitosan was prepared from shrimp shell wastes and was cross-linked with different dosages of glutaraldehyde or glyoxal (100-80,000 mg/l). It was shown that the amounts of solute adsorption and the immobilization capacity of acid phosphatase on cross-linked chitosan beads were substantially affected by their degree of cross-linking. The cross-linking rate of chitosan with glutaraldehyde could be described by a pseudo-second-order equation and the cross-linking equilibrium by the Freundlich equation. This provided an experimental method to control the degree of cross-linking of chitosan beads. Finally, the activity and lifetime of the immobilized enzyme were measured to evaluate the application potential.
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