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pH-Dependent photoluminescence "switch-on" nanosensors composed of silver nanoparticles and nitrogen and sulphur co-doped carbon dots for discriminative detection of biothiols.

Authors
  • Xiang, Feng1
  • Li, Jizhou
  • Liu, Zhongde
  • 1 Key Laboratory of Luminescent and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400716, China. [email protected] , (China)
Type
Published Article
Journal
The Analyst
Publisher
The Royal Society of Chemistry
Publication Date
Nov 18, 2019
Volume
144
Issue
23
Pages
7057–7063
Identifiers
DOI: 10.1039/c9an01488h
PMID: 31659354
Source
Medline
Language
English
License
Unknown

Abstract

Very close structure and property similarities among biothiols, such as glutathione (GSH), cysteine (Cys), and homocysteine (Hcy), present a major challenge to achieve their discriminative detection. In this contribution, a nanomaterial surface energy transfer (NSET) system was established to discriminate GSH from Cys and Hcy with the photoluminescence (PL) "switch-on" response. The nanosensor was constructed using nitrogen and sulphur co-doped carbon dots (N,S-CDs) and silver nanoparticles (AgNPs) through assembling an energy transfer-based quenching system, featuring the pH-promoted distinct PL "switch-on" response. Under neutral conditions, only Cys and Hcy can encapsulate AgNPs, leaving little chance for N,S-CD binding on the surface of AgNPs, which can lead to PL signal recovery, and the total quantity of Cys and Hcy can be determined. However, at pH 3.0 all three kinds of biothiols can lead to the PL signal recovery and the total quantity of GSH, Cys, and Hcy can be determined, due to the similar slopes and intercepts of their calibration curves. Thus, the concentration of GSH could be further calculated and the strategy was successfully applied for the detection of GSH in human serum, demonstrating its potential in bioanalysis and significance in addressing biological and medicinal requirements.

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