Journal
ULTRAMICROSCOPY
Volume 109, Issue 8, Pages 1001-1005Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultramic.2009.03.002
Keywords
Atomic force microscope; Cyclic voltammogram; Ferritin immobilization; Gold electrode
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Properties of ferritin, immobilized on dithiobis (N-succinimydyl propionate) (DTSP)-covered gold electrode, in 3-morpholino propanesulfonic acid buffer were investigated by AFM and FE-SEM. Electrochemical properties the ferritin was measured by a cyclic volatammetry. When the potentials of 0.2, 0.34, and 1.0V vs. Ag/AgCl were applied for 15 h for the ferritin immobilization, the electrode potential of Fe(II)/Fe(III) in ferritin changed to negative values. Negative electrode potential shift of Fe(II)/Fe(III) in ferritin with respect to the applied potential could be attributed to the stabilized ferritin on DTSP-covered gold electrode. From AFM and SEM images, it was proven that ferritins fixed at below 0.34 V were clusters in several micrometer and those fixed at higher applied potential than OCV were finely distributed particles in several tens of nanometer. (C) 2009 Elsevier B.V. All rights reserved.
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