Figures & data
Figure 1. Schematic illustration for preparation of amino acid-modified chitosan beads and immobilization of enzymes (Yi et al. Citation2009).
![Figure 1. Schematic illustration for preparation of amino acid-modified chitosan beads and immobilization of enzymes (Yi et al. Citation2009).](/cms/asset/824933a6-b8ee-4e6d-bf3d-1b17b1081a3a/ianb_a_742095_f0001_b.gif)
Figure 2. Scanning electron micrographs of the surfaces of (A) chitosan bead, (B) lysine-modified chitosan bead, (C) alanine-modified chitosan bead, (D) catalase-immobilized chitosan bead, (E) catalase-immobilized Lys–CB, (F) catalase-immobilized Ala–CB.
![Figure 2. Scanning electron micrographs of the surfaces of (A) chitosan bead, (B) lysine-modified chitosan bead, (C) alanine-modified chitosan bead, (D) catalase-immobilized chitosan bead, (E) catalase-immobilized Lys–CB, (F) catalase-immobilized Ala–CB.](/cms/asset/103eb4a9-fe6d-4441-8ac6-e0a80c245a9c/ianb_a_742095_f0002_b.gif)
Table I. Kinetic parameters of free and immobilized catalases.
Figure 4. pH (A) and temperature (B) stability of free and immobilized catalase at various pH and temperature after 60 min (
![](/cms/asset/1c1ebad4-9889-4b57-ae9d-2a498aee9b76/ianb_a_742095_ilg0003.gif)
![](/cms/asset/10f228c8-1bf5-4948-a269-3d03dd2011e8/ianb_a_742095_ilg0005.gif)
![](/cms/asset/1f5f8970-6228-4ea5-a9a9-6769d7eca909/ianb_a_742095_ilg0007.gif)
![Figure 4. pH (A) and temperature (B) stability of free and immobilized catalase at various pH and temperature after 60 min (Display full size: free enzyme, Display full size: chitosan, Display full size: chitosan–alanine, Display full size: chitosan–lysine).](/cms/asset/1621f07c-932b-4d93-8b80-239cad39ac66/ianb_a_742095_f0004_b.gif)
Figure 5. Reusability of immobilized catalase on modified chitosan beads (
![](/cms/asset/f9b0a97e-42ca-4ee0-a02e-60ed8661b2dd/ianb_a_742095_ilg0011.gif)
![Figure 5. Reusability of immobilized catalase on modified chitosan beads (Display full size: lysine-modified chitosan beads, Display full size: alanine-modified chitosan beads).](/cms/asset/c5e72963-8929-43ac-867f-3d819a8b49e6/ianb_a_742095_f0005_b.gif)