Differential Interaction of Metal Ions with Gold Nanoclusters and Application in Detection of Cobalt and Cadmium.

Akshath, U. S. and Praveena, Bhatt and Sridevi Annapurna, Singh (2020) Differential Interaction of Metal Ions with Gold Nanoclusters and Application in Detection of Cobalt and Cadmium. Journal of Fluorescence, 30. pp. 537-545.

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Abstract

Interest in biosensing platforms using protein fluorescent gold nanoclusters (FGNCs) has grown significantly in the past due to the unique optical properties they offer. This study investigates the interaction of metal ions with FGNCs, and the structural modifications brought about by the interaction resulting in fluorescence changes of the cluster and its successful application in the detection of two heavy metals, cobalt and cadmium. The binding of cobalt and cadmium to FGNCs synthesized from BSA significantly altered the secondary structure of the protein, causing a change in its hydrophobicity. It also resulted in a change in fluorescence properties of FGNCs by intersystem crossing (ICT) and fluorescence resonance energy transfer (FRET). Cobalt and cadmium could successfully be detected in the range of 5–165 ng/mL (R2 = 0.95) and 20–1000 ng/ mL (R2 = 0.91), respectively, with appreciable sensitivity. The principle was also applied for the detection of Vitamin B12 in commercially available ampoules, validating the proposed method.

Item Type:	Article
Uncontrolled Keywords:	Fluorescent gold nanoclusters . Metal-ion interaction . Circular dichroism . FRET
Subjects:	600 Technology > 05 Chemical engineering > 01 Biotechnology and Bioengineering
Divisions:	Food Microbiology Protein Chemistry and Technology
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	05 Oct 2020 08:34
Last Modified:	05 Oct 2020 08:34
URI:	http://ir.cftri.res.in/id/eprint/14496

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