Copper quantum clusters in protein matrix: potential sensor of Pb2+ ion

Goswami, Nirmal ; Giri, Anupam ; Bootharaju, M. S. ; Xavier, Paulrajpillai Lourdu ; Pradeep, Thalappil ; Pal, Samir Kumar (2011) Copper quantum clusters in protein matrix: potential sensor of Pb2+ ion Analytical Chemistry, 83 (24). pp. 9676-9680. ISSN 0003-2700

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ac202610e

Related URL: http://dx.doi.org/10.1021/ac202610e

Abstract

A one-pot synthesis of extremely stable, water-soluble Cu quantum clusters (QCs) capped with a model protein, bovine serum albumin (BSA), is reported. From matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry, we assign the clusters to be composed of Cu5 and Cu3 cores. The QCs also show luminescence properties having excitation and emission maxima at 325 and 410 nm, respectively, with a quantum yield of 0.15, which are found to be different from that of protein alone in similar experimental conditions. The quenching of luminescence of the protein-capped Cu QCs in the presence of very low hydrogen peroxide concentration (approximately nanomolar, or less than part-per-billion) reflects the efficacy of the QCs as a potential sensing material in biological environments. Moreover, as-prepared Cu QCs can detect highly toxic Pb2+ ions in water, even at the part-per-million level, without suffering any interference from other metal ions.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:82401
Deposited On:10 Feb 2012 12:59
Last Modified:10 Feb 2012 12:59

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