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Adsorption of Antibody Protein onto Plasma-Polymerized Film Characterized by Atomic Force Microscopy and Quartz Crystal Microbalance

Hitoshi MUGURUMA, Satoshi MIURA, Naoya MURATA

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Summary :

Adsorption of antibody protein (anti-human IgG) onto plasma-polymerized thin films (PPF) with nanoscale thickness was characterized by atomic force microscopy (AFM) and quartz crystal microbalance (QCM). The PPF surface is very flat (less than 1 nm roughness) and its properties (charge and wettability) can be easily changed while retaining the backbone structure. We focus on two types of surfaces: one is the pristine surface of hexamethyldisiloxane (HMDS) PPF (hydrophobic) and the other is an HMDS PPF surface with nitrogen-plasma treatment (hydrophilic and positive-charged surface). The AFM image showed that the antibody molecules were densely adsorbed onto both surfaces and individual antibody molecules could be observed. The QCM profiles show a corresponding tendency with the AFM images. These results indicate that the plasma polymerized film can be the suitable biointerface for the application of biosensor and bioassay.

Publication
IEICE TRANSACTIONS on Electronics Vol.E90-C No.3 pp.649-651
Publication Date
2007/03/01
Publicized
Online ISSN
1745-1353
DOI
10.1093/ietele/e90-c.3.649
Type of Manuscript
LETTER
Category
Organic Molecular Electronics

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