Label-free fluorescence “turn-on” detection of SO32− by gold nanoclusters: integration in a hydrogel platform and intracellular detection

Sachdev, Abhay and Raj, Rocky and Matai, Ishita and Kumar, vinay and Gopinath, P. and Mishra, Sunita (2019) Label-free fluorescence “turn-on” detection of SO32− by gold nanoclusters: integration in a hydrogel platform and intracellular detection. Analytical Methods, 11 (9). pp. 1214-1223. ISSN 1759-9660 (print) 1759-9679 (web)

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Official URL: https://pubs.rsc.org/en/content/articlelanding/201...

Abstract

A facile approach for the fluorescence based detection of sulfite (SO32−) using gold nanoclusters (Au NCs) has been reported. The detection assay relies on the effective quenching of the fluorescence of Au NCs in the presence of Cu2+, which could eventually be recovered upon the addition of SO32−. The proposed Cu2+ assisted fluorescence “turn-on” detection method for SO32− was highly sensitive and demonstrated a linear response towards SO32− within the desired concentration range. Importantly, the sensing system possessed high selectivity for SO32− compared to other competitive anionic analytes, allowing for an analytically robust and reliable detection. Further, fluorescent Au NC-hydrogels were developed, which present a way forward for solid sensing platforms for the detection of SO32− in aqueous solutions, making it a meaningful approach for instrument-free and visual monitoring. Owing to their excellent analytical characteristics, Au NCs were successfully employed for intracellular SO32− detection. Therefore, the present study encompasses the manifold detection aspects of Au NC based sensors.

Item Type: Article
Uncontrolled Keywords: fluorescence, quenching, nanoclusters
Subjects: CSIO > Chemistry
Depositing User: Ms T Kaur
Date Deposited: 14 Feb 2020 16:09
Last Modified: 14 Feb 2020 16:09
URI: http://csioir.csio.res.in/id/eprint/784

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