Issue 63, 2015

Highly sensitive detection of 2,4,6-trinitrophenol (TNP) based on lysozyme capped CdS quantum dots

Abstract

This work presents a novel method for nitroaromatic compound detection using lysozyme-capped CdS quantum dots (Lys-CdS QDs). Cd2+ can react with S2− to generate fluorescent CdS QDs in the presence of lysozyme. The Lys-CdS QDs can bind to 2,4,6-trinitrophenol (TNP) in water via an acid–base pairing interaction between the electron-rich amino ligands and the electron-deficient aromatic ring of TNP. The electrons in the QDs transfer to the TNP molecules, leading to fluorescence quenching. The fluorescence decreases with an increase in TNP concentration and the fluorescence intensity is negatively proportional to the TNP concentration in the range from 0.5 μmol L−1 to 15 μmol L−1 with a detection limit of 0.1 μmol L−1. The newly-developed fluorescence probe shows excellent resistance to the interference of metal ions, such as Cu2+, Fe3+, and Pb2+, when compared with other fluorescence probes. The present method is cost-effective, convenient, and does not require any complicated synthetic procedures.

Graphical abstract: Highly sensitive detection of 2,4,6-trinitrophenol (TNP) based on lysozyme capped CdS quantum dots

Supplementary files

Article information

Article type
Paper
Submitted
06 Apr 2015
Accepted
26 May 2015
First published
27 May 2015

RSC Adv., 2015,5, 51428-51434

Author version available

Highly sensitive detection of 2,4,6-trinitrophenol (TNP) based on lysozyme capped CdS quantum dots

W. Na, X. Liu, S. Pang and X. Su, RSC Adv., 2015, 5, 51428 DOI: 10.1039/C5RA06101F

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