relation: http://publicatio.bibl.u-szeged.hu/10451/
title: Gold nanohybrid systems with tunable fluorescent feature: Interaction of cysteine and cysteine-containing peptides with gold in two- and three-dimensional systems
creator:  Csapó Edit
creator:  Ungor Ditta Anita
creator:  Juhász Ádám
creator:  Tóth Gábor
creator:  Dékány Imre
description: Abstract Interactions of L-cysteine (Cys), L-cysteinyl-tryptophan (Cys-Trp) and L-glutathione (γ-Glu-Cys-Gly, GSH) with gold-coated surface (Au0) and tetrachloroaurate ions (AuCl4−) were studied in two(2D)- and three(3D)-dimensional systems, respectively. The irreversible bindings of the molecules onto gold surface via gold-sulphur (Au-S) bonds were proven by 2D quartz crystal microbalance (QCM) and surface plasmon resonance (SPR) techniques. Moreover, the cross-sectional areas and the possible orientation of these biomolecules on gold film were also determined and compared with the theoretical calculated values. The spontaneous interactions of Cys, Cys-Trp and GSH with AuCl4− were studied in aqueous medium at 37 °C as well. Depending on the pH and the molar ratios of AuCl4−/molecules, the formation of diverse gold nanostructures were confirmed. It was proven that the spontaneous interactions of AuCl4− with Cys and GSH result in the formation of orange- and yellow-emitting gold nanohybrid systems (λemission = 620 and 590 nm) consist of a self-assembly structure at acidic conditions. In contrast, at alkaline medium fluorescent Au nanostructures were not formed in the AuCl4−/Cys system, but ultra-small blue-emitting gold nanoclusters (Au NCs) were identified in the samples containing AuCl4−/GSH. For AuCl4−/Cys-Trp systems the presence of Trp aromatic side chain prevents the formation of the fluorescence self-assembly nanostructure and depending on the pH, Au concentration and ratio of the reactants the appearance of dipeptide-stabilized plasmonic gold nanoparticles (Au NPs) or supramolecular gold complexes having intense blue fluorescence (λ = 470 nm) were observed.
date: 2016
type: Folyóiratcikk
type: PeerReviewed
format: text
identifier: http://publicatio.bibl.u-szeged.hu/10451/1/1_s2.0_S0927775716308494_main_u.pdf
identifier:     Csapó Edit;  Ungor Ditta Anita;  Juhász Ádám;  Tóth Gábor;  Dékány Imre: Gold nanohybrid systems with tunable fluorescent feature: Interaction of cysteine and cysteine-containing peptides with gold in two- and three-dimensional systems.   COLLOIDS AND SURFACES A : PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 511.  pp. 264-271.  ISSN 0927-7757 (2016)     
identifier: doi:10.1016/j.colsurfa.2016.10.003
relation: 3123026
language: eng
relation: info:eu-repo/semantics/altIdentifier/doi/10.1016/j.colsurfa.2016.10.003
rights: info:eu-repo/semantics/restrictedAccess