Fluorescent indicator displacement assay: ultrasensitive detection of glutathione and selective cancer cell imaging

Das, Krishnendu ; Sarkar, Saheli ; Das, Prasanta Kumar (2016) Fluorescent indicator displacement assay: ultrasensitive detection of glutathione and selective cancer cell imaging ACS Applied Materials & Interfaces, 8 (39). pp. 25691-25701. ISSN 1944-8244

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Official URL: http://pubs.acs.org/doi/abs/10.1021/acsami.6b06353

Related URL: http://dx.doi.org/10.1021/acsami.6b06353

Abstract

This Research Article reports the development of nanohybrid comprising of anionic carbon dots (ACD) protected gold nanoparticle (GNP). ACD directly cap GNP through its anionic surface functionalization leading to the formation of stable aqueous GNP dispersion. This newly developed ACD-GNP nanohybrid has been thoroughly characterized by different spectroscopic and microscopic techniques. This nanohybrid is successfully employed toward the selective sensing of glutathione (GSH). The mechanism of GSH sensing by this nanosensor is based on the GSH triggered displacement of fluorescent indicator ACD from the GNP surface. Upon capping GNP, intrinsic fluorescence of ACD gets quenched. Addition of GSH displaces the fluorescent indicator ACD from GNP surface and restores the fluorescence signal of ACD. This nanosensor exhibits very high selectivity as well as sensitivity toward glutathione over the other biothiols and can detect as low as 6 nM of GSH. More importantly, selective imaging of the cancer cells over the noncancerous cells was achieved by this ACD-GNP hybrid implying its potential applications in biosensing, as well as in cancer diagnosis.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
Keywords:Carbon Dots; Glutathione; Gold Nanoparticle; Imaging; Nanohybrid; Sensing
ID Code:108546
Deposited On:01 Feb 2018 11:14
Last Modified:01 Feb 2018 11:14

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