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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F14%3A10283699%21RIV15-MSM-11320___
rdf:type
skos:Concept n13:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1021/jp5005709
dcterms:description
Silver nanoparticles (Ag NPs) stabilized with a permeable layer of long-chain polyethylene glycol (PEG) represent a new generation of surface-enhanced Raman scattering (SERS) substrates for bioanalytical applications. This paper will shed light on their efficiency in the SERS detection of biomolecules. Two types of thiol-terminated PEG (average molecular weight 5000 g/mol) were used. Metalation of free-base porphyrins (10(-9)-10(-6) M) of different size and charge was employed as the probe of accessibility of the Ag-PEG NP surface. The influence of NaCl (0.01 M) on the system was examined. The metalation was significantly decreased by the interaction of porphyrins with propionylamino groups of PEG I, while no interaction with the neutral chain of PEG2 was observed. Sterical hindrance of the porphyrin side groups seemed to cause a rather perpendicular porphyrin orientation on both types of Ag-PEG NP surfaces, inhibiting the metalation. Moreover, chloride anions influenced the structure of the polymer coating and improved the porphyrin accessibility on the Ag-PEG1 NPs. Finally, the studied Ag-PEG NPs remained isolated even after addition of porphyrins and chlorides, therefore being favorable for SERS applications inside the living cells. Silver nanoparticles (Ag NPs) stabilized with a permeable layer of long-chain polyethylene glycol (PEG) represent a new generation of surface-enhanced Raman scattering (SERS) substrates for bioanalytical applications. This paper will shed light on their efficiency in the SERS detection of biomolecules. Two types of thiol-terminated PEG (average molecular weight 5000 g/mol) were used. Metalation of free-base porphyrins (10(-9)-10(-6) M) of different size and charge was employed as the probe of accessibility of the Ag-PEG NP surface. The influence of NaCl (0.01 M) on the system was examined. The metalation was significantly decreased by the interaction of porphyrins with propionylamino groups of PEG I, while no interaction with the neutral chain of PEG2 was observed. Sterical hindrance of the porphyrin side groups seemed to cause a rather perpendicular porphyrin orientation on both types of Ag-PEG NP surfaces, inhibiting the metalation. Moreover, chloride anions influenced the structure of the polymer coating and improved the porphyrin accessibility on the Ag-PEG1 NPs. Finally, the studied Ag-PEG NPs remained isolated even after addition of porphyrins and chlorides, therefore being favorable for SERS applications inside the living cells.
dcterms:title
Polyethylene-glycol-Stabilized Ag Nanoparticles for Surface-Enhanced Raman Scattering Spectroscopy: Ag Surface Accessibility Studied Using Metalation of Free-Base Porphyrins Polyethylene-glycol-Stabilized Ag Nanoparticles for Surface-Enhanced Raman Scattering Spectroscopy: Ag Surface Accessibility Studied Using Metalation of Free-Base Porphyrins
skos:prefLabel
Polyethylene-glycol-Stabilized Ag Nanoparticles for Surface-Enhanced Raman Scattering Spectroscopy: Ag Surface Accessibility Studied Using Metalation of Free-Base Porphyrins Polyethylene-glycol-Stabilized Ag Nanoparticles for Surface-Enhanced Raman Scattering Spectroscopy: Ag Surface Accessibility Studied Using Metalation of Free-Base Porphyrins
skos:notation
RIV/00216208:11320/14:10283699!RIV15-MSM-11320___
n3:aktivita
n19:I n19:S n19:P
n3:aktivity
I, P(7AMB12FR023), P(GBP205/12/G118), S
n3:cisloPeriodika
14
n3:dodaniDat
n6:2015
n3:domaciTvurceVysledku
n15:8292671 n15:3343928
n3:druhVysledku
n20:J
n3:duvernostUdaju
n7:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
37402
n3:idVysledku
RIV/00216208:11320/14:10283699
n3:jazykVysledku
n18:eng
n3:klicovaSlova
spectra; 20-tetrakis(1-methyl-4-pyridyl)porphyrin; 15; 10; 5; gold; systems; adsorption; serrs; colloids; protoporphyrin-ix; silver nanoparticles
n3:klicoveSlovo
n9:15 n9:gold n9:spectra n9:5 n9:silver%20nanoparticles n9:adsorption n9:protoporphyrin-ix n9:10 n9:systems n9:20-tetrakis%281-methyl-4-pyridyl%29porphyrin n9:colloids n9:serrs
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[6698C6FE3203]
n3:nazevZdroje
Journal of Physical Chemistry C
n3:obor
n16:BO
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
5
n3:projekt
n10:7AMB12FR023 n10:GBP205%2F12%2FG118
n3:rokUplatneniVysledku
n6:2014
n3:svazekPeriodika
118
n3:tvurceVysledku
Šimáková, Petra Herve-Aubert, Katel Procházka, Marek Chourpa, Igor Gautier, Juliette
n3:wos
000334571700051
s:issn
1932-7447
s:numberOfPages
8
n11:doi
10.1021/jp5005709
n17:organizacniJednotka
11320