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Issue 4, 2015
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Chitosan-modified silver@ruthenium hybrid nanoparticles: evaluation of physico-chemical properties and bio-affinity with sialic acid

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Abstract

Hybrid nanoparticles (NPs) integrated with dye molecules have attracted interest for biomolecular detection, due to their effortless fabrication, timely operation, controllable specific recognition and low-cost. In this study, hybrid core–shell NPs made of a metal–dye complex (AgNPs@[Ru(bpy)3]2+) core and a chitosan (CS) shell exhibiting a selective fluorescence quenching effect were successfully prepared using a cost-effective wet-chemical approach. The physico-chemical properties of NPs were determined by spectroscopy and light scattering measurements. The bio-affinity of the AgNPs@[Ru(bpy)3]2+/CS was evaluated in aqueous media using sialic acid (SA) as the target molecule in the presence of different monosaccharides and anionic biomolecules as interferents. A significant fluorescence quenching of hybrid NPs was observed in aqueous solutions of SA with interferents, while no significant quenching effect was detected in SA-free interferent solutions. The selective binding of SA to the particles resulted from favorable electrostatic interactions and inter-molecular hydrogen bonding with the functional groups of CS. The hybrid NP system displayed a good sensitivity for SA with a detection limit of 5.1 nM and a concentration dependent fluorescence quenching for SA concentrations ranging from 25 nM to 3.2 μM. This hybrid NP system represents a promising alternative probe for detecting sialic acid in complex samples.

Graphical abstract: Chitosan-modified silver@ruthenium hybrid nanoparticles: evaluation of physico-chemical properties and bio-affinity with sialic acid

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Supplementary files

Article information


Submitted
05 Sep 2014
Accepted
11 Nov 2014
First published
18 Nov 2014

J. Mater. Chem. B, 2015,3, 665-672
Article type
Paper
Author version available

Chitosan-modified silver@ruthenium hybrid nanoparticles: evaluation of physico-chemical properties and bio-affinity with sialic acid

M. Veerapandian, X. X. Zhu and S. Giasson, J. Mater. Chem. B, 2015, 3, 665
DOI: 10.1039/C4TB01475H

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