TY  - JOUR
AU  - Majzik, Andrea
AU  - Fülöp, Lívia
AU  - Csapó, Edit
AU  - Bogár, Ferenc
AU  - Martinek, Tamás
AU  - Penke, Botond
AU  - Bíró, G
AU  - Dékány, Imre
TI  - Functionalization of gold nanoparticles with amino acid, β-amyloid peptides and fragment
JF  - COLLOIDS AND SURFACES B: BIOINTERFACES
J2  - COLLOID SURFACE B
VL  - 81
PY  - 2010
IS  - 1
SP  - 235
EP  - 241
PG  - 7
SN  - 0927-7765
DO  - 10.1016/j.colsurfb.2010.07.011
UR  - https://m2.mtmt.hu/api/publication/1417384
ID  - 1417384
N1  - Funding Agency and Grant Number: Hungarian Scientific Research Fund [73307, 73672, FP-7 201 159]; Janos Bolyai Research\n Funding text: The authors are very thankful for the financial support of the Hungarian Scientific Research Fund OTKA Nr. K 73307, OTKA Nr. NK 73672 and Memoload (FP-7 201 159).; L. Fulop wishes to thank the Hungarian Academy of Sciences for the support of the Janos Bolyai Research Grant.\n
AB  - Gold nanoparticles (Au NPs) were functionalized by cysteine (Cys), beta-amyloid peptides (Cys(0) A beta(1-28), Cys(0)A beta(1-40), A beta(1-42)) and a pentapeptide fragment (Leu-Pro-Phe-Phe-Asp-OH (LPFFD-OH)). Optical absorption spectra of these systems were recorded and the plasmon resonance maximum values (lambda(max)) of the UV-vis spectra together with the transmission electron microscopy (TEM) images were also analysed. Both TEM images and the appearance of a new absorption band between 720 and 750 nm in the visible spectra of the Au-cysteine and Au-LPFFD-OH systems most probably indicate that upon addition of these molecules to Au NPs-containing aqueous dispersions formation of aggregates is occurred. The wavelength shift between the two observed absorption bands in cysteine- and pentapeptide-modified Au NPs systems are A?, 185 and 193 nm, respectively. These results suggest that the monodisperse spherical gold nanoparticles were arranged to chained structure due to the effect of these molecules. For confirmation of the binding of citrate and cysteine onto the plasmonic metal surface H-1 NMR measurements were also performed. 1H NMR results may suggest that the citrate layer on the metal surface is replaced by cysteine leading to a formation of organic double layer structure. In the presence of beta-amyloid peptides the aggregation was not observed, especially in the Au-Cys(0)A(1-40) and Au-A 42 systems, however compared to the cysteine or LPFFD-OH-containing gold dispersion with Cys(0)A beta(1-28) measurable less aggregation were occurred. The spectral parameters clearly suggest that A beta(1-42) can attach or bind to the surface of gold nanoparticles via both the apolar and the N-donors containing side-chains of amino acids and no aggregation in the colloidal gold dispersion was observed. (C) 2010 Elsevier ay. All rights reserved.
LA  - English
DB  - MTMT
ER  -