Concanavalin A Immobilized Affinity Adsorbents for Reversible Use in Yeast Invertase Adsorption
✍ Scribed by Handan Yavuz; Sinan Akgöl; Yakup Arica; Adil Denizli
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 117 KB
- Volume
- 4
- Category
- Article
- ISSN
- 1616-5187
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✦ Synopsis
Abstract
Summary: Concanavalin A (Con A) immobilized poly(2‐hydroxyethyl methacrylate) (PHEMA) beads were investigated for specific adsorption of yeast invertase from aqueous solutions. PHEMA beads were prepared by a suspension polymerization technique with an average size of 150–200 μm, and activated by epichlorohydrin. Con A was then immobilized by covalent binding onto these beads. The maximum Con A immobilization was found to be 10 mg/g. The invertase‐loading capability of the PHEMA/Con A beads was 107 mg/g. The maximum invertase adsorption capacity on the PHEMA/Con A adsorbents was observed at pH 5.0. The values of the Michaelis constant K~m~ of invertase were significantly larger upon adsorption, indicating decreased affinity by the enzyme for its substrate, whereas V~max~ was smaller for the adsorbed invertase. Adsorption improved the pH stability of the enzyme as well as its temperature stability. Thermal stability was found to increase with adsorption. The adsorbed enzyme activity was found to be quite stable in repeated experiments.
Storage stability of adsorbed invertase.
magnified imageStorage stability of adsorbed invertase.