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Adsorption and decomposition of a dipeptide (Ala-Trp) in TiO2 photocatalytic systems

Paper ID Volume ID Publish Year Pages File Format Full-Text
27877 44048 2007 9 PDF Available
Title
Adsorption and decomposition of a dipeptide (Ala-Trp) in TiO2 photocatalytic systems
Abstract

The adsorption and photodecomposition of a dipeptide, alanyl-tryptophan (Ala-Trp) on a TiO2 surface were investigated by zeta potential measurements and 1H NMR spectroscopy in TiO2 aqueous suspension systems. The photodecomposition rate of Ala-Trp was lower than that of Trp but higher than that of Ala (Ala < Ala-Trp < Trp), reflecting the adsorbability and the photocatalytic reactivity of the component amino acids. The most efficient photocatalysis of Ala-Trp takes place by the adsorption of the heterocyclic ring (3-indolyl group) on the basic terminal hydroxyl sites of TiO2. The adsorptions of the molecule on the basic terminal OH sites through the carboxyl group or the peptide bond, or on the acidic bridged OH sites through NH2 group were also suggested. However, the photocatalytic reactivities for such adsorptions are considered to be lower. A plausible adsorption scheme is presented with the decomposition efficiency.

Keywords
Dipeptide; Adsorption; TiO2; Photocatalysis; Zeta potential; Isoelectric point
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Adsorption and decomposition of a dipeptide (Ala-Trp) in TiO2 photocatalytic systems
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 192, Issues 2–3, 15 December 2007, Pages 105–113
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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