Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (11): 3519.doi: 10.7503/cjcu20210392

• Article • Previous Articles     Next Articles

Construction of Electrochemiluminescence Sensing Interface Based on Silver Nanoclusters-Silica Nanoparticles and Biomolecular Recognition

WANG Bodong, PAN Meichen, ZHUO Ying()   

  1. Key Laboratory of Luminescence Analysis and Molecular Sensing(Southwest University),Ministry of Education,College of Chemistry and Chemical Engineering,Southwest University,Chongqing 400715,China
  • Received:2021-06-08 Online:2021-11-10 Published:2021-11-10
  • Contact: ZHUO Ying E-mail:yingzhuo@swu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22022408);the Chongqing Talents Youth Top?notch Personnel Support Program, China(CQYC201905067)

Abstract:

A highly sensitive L-Cys(L-cysteine) biosensor was constructed via silver nanoclusters loaded on the surface of silica nanoparticles(Ag NCs-SiO2 NPs) as an electrochemiluminescence(ECL) nanocomposite modified on the surface of glassy carbon electrode. The surface of silica nanoparticles(SiO2 NPs) was functio-nalized with amino and sulfhydryl groups by bovine serum protein(BSA), and then silver nanoclusters (Ag NCs) were in situ reduced on the surface of SiO2 NPs by using BSA as a template and a reducing agent, which realized the stable load of silver nanoclusters. The Ag NCs-SiO2 NPs electrochemiluminescence nanocomposites with the enhanced cathodic ECL signal were successfully obtained. With the existence of L-Cys in the solution, it covalently binds to Ag NCs forming Ag—S bond and quenching the ECL signal. Based on the above principle, a biosensor with the on-off signal response mode is constructed for the detection of L-Cys. The concentration range of L-Cys detected by the biosensor is 50 nmol/L—50 μmol/L. At the same time, the detection limit is 13.7 nmol/L, which can realize the sensitivity and specificity analysis of L-Cys. The biosensor constructed above is expected to be extensively applied in biological, medical and other fields.

Key words: Electrochemiluminescence, Silver nanoclusters, Silica nanoparticles, Biosensor, L-Cysteine

CLC Number: 

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