Functionalization of manganite nanoparticles and their interaction with biologically relevant small ligands: picosecond time-resolved FRET studies

Giri, Anupam ; Makhal, Abhinandan ; Ghosh, Barnali ; Raychaudhuri, A. K. ; Pal, Samir Kumar (2010) Functionalization of manganite nanoparticles and their interaction with biologically relevant small ligands: picosecond time-resolved FRET studies Nanoscale, 2 (12). pp. 2704-2709. ISSN 2040-3364

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Official URL: http://pubs.rsc.org/en/Content/ArticleLanding/2010...

Related URL: http://dx.doi.org/10.1039/C0NR00490A

Abstract

We report molecular functionalization of the promising manganite nanoparticles La0.67Sr0.33MnO3 (LSMO) for their solubilization in aqueous environments. The functionalization of individual NPs with the biocompatible citrate ligand, as confirmed by Fourier transform infrared (FTIR) spectroscopy, reveals that citrates are covalently attached to the surface of the NPs. UV-VIS spectroscopic studies on the citrate functionalized NPs reveals an optical band in the visible region. Uniform size selectivity (2.6 nm) of the functionalization process is confirmed from high resolution transmission electron microscope (HRTEM). In the present study we have used the optical band of the functionalized NPs to monitor their interaction with other biologically important ligands. Forster resonance energy transfer (FRET) of a covalently attached probe 4-nitrophenylanthranilate (NPA) with the capped NPs confirm the attachment of the NPA ligands to the surface functional group (-OH) of the citrate ligand. The FRET of a DNA base mimic, 2-aminopurine (2AP), with the NPs confirms the surface adsorption of 2AP. Our study may find relevance in the study of the interaction of individual manganite NPs with drug/ligand molecules.

Item Type:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:42624
Deposited On:04 Jun 2011 12:38
Last Modified:17 May 2016 23:51

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