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Protein adsorption and peroxidation of rat retinas under stimulation of a neural probe coated with polyaniline

Paper ID Volume ID Publish Year Pages File Format Full-Text
755 61 2011 8 PDF Available
Title
Protein adsorption and peroxidation of rat retinas under stimulation of a neural probe coated with polyaniline
Abstract

For the purpose of investigating the potential use of conducting polymers, i.e. polyaniline (PANi), as electrode coating material for improving the function of neural probes, a PANi-coated platinum (Pt) electrode was prepared by the in situ polymerization method. Protein adsorption was observed by atomic force microscopy/scanning electron microscopy and sodium dodecyl sulfate polyacrylamide gel electrophoresis, as well as quantification. Peroxidation of rat retinas was evaluated by determination of conjugated dienes and PLOOH, which were quantified by UV–visible spectrophotometer and high-performance liquid chromatography. The stability of PANi coating for 6 months was also estimated with an in vitro electrical stimulation system. This revealed that: (1) PANi with regular and compact nanoparticles 20–40 nm in diameter was successfully polymerized on the uncoated platinum electrode surface; (2) the PANi-coated Pt electrode adsorbed fewer retinal fragments and induced less peroxidation than the uncoated platinum electrode; (3) in contrast to the uncoated platinum electrode, the PANi-coated Pt electrode surface tended to aggregate retinal fragments rather than spread them, which may help to reduce inflammation and scar formation in long-term implantation; (4) the PANi coating exhibited excellent properties in terms of the intactness and the stable nanoparticle morphology after 6 months’ electrical stimulation, while corrosion occurred on the uncoated platinum electrode after 1 month.

Keywords
Neural probe; Electrical stimulation; Polyaniline; Protein adsorption; Lipid peroxidation
First Page Preview
Protein adsorption and peroxidation of rat retinas under stimulation of a neural probe coated with polyaniline
Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 7, Issue 10, October 2011, Pages 3738–3745
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering