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The photocatalytic inactivation effect of Ag–TiO2 on β-amyloid peptide (1–42)

Paper ID Volume ID Publish Year Pages File Format Full-Text
26878 43984 2013 11 PDF Available
Title
The photocatalytic inactivation effect of Ag–TiO2 on β-amyloid peptide (1–42)
Abstract

Due to its low toxicity and excellent biocompatibility, titanium dioxide and its alloyed are widely used in biomedical applications. Furthermore, TiO2 can be excited by UV light to create charge carriers giving rise to photocatalytic redox reactions at its surface and photo-induced super-hydrophilicity. In this work, TiO2 films were modified with silver (Ag–TiO2) by the photocatalytic reduction of Ag+ from solution. The films and the adsorption of β-amyloid (1–42), were studied using Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and atomic force microscopy (AFM). These films were confirmed to contain mainly anatase crystallites and the photo-reduced Ag was predominantly Ag0 (>0%). Ag loading of the TiO2 markedly enhanced the Raman signal (ca. 15-fold), but caused significant changes to the protein spectrum indicating non-specific binding of β-amyloid side chain residues to the silver. The amide modes remained well-resolved and were used to estimate the conformational change induced in the protein by the silver. Raman analysis showed an increase in the intensity of the band at ∼1665 cm−1 assigned to the disordered conformation of the β-amyloid, suggesting that the adsorption to the silver sites induces conformational changes. Contaminated surfaces were exposed to UVB irradiation, caused further conformational changes in the β-amyloid, which mildly inhibited amyloid fibril formation, thought to be induced through a photocatalytic mechanism.

► TiO2 surface modified with Ag nano-clusters. ► Ag–TiO2 synthesised and characterised. ► Absorption study using β-amyloid (1–42). ► Investigation of peptide configuration via Raman, FTIR, XPS spectroscopes. ► β-Amyloid was subsequently degraded by photocatalysis.

Keywords
Photocatalytic; AgTiO2; β-Amyloid; XPS; Vibrational spectroscopy; AFM
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The photocatalytic inactivation effect of Ag–TiO2 on β-amyloid peptide (1–42)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 254, 15 February 2013, Pages 1–11
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us