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Biosens Bioelectron. 2017 Nov 15;97:115-121. doi: 10.1016/j.bios.2017.05.046. Epub 2017 May 26.

Zinc-doping enhanced cadmium sulfide electrochemiluminescence behavior based on Au-Cu alloy nanocrystals quenching for insulin detection.

Author information

1
Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
2
Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China. Electronic address: jndxfandawei@126.com.

Abstract

Novel and sensitive sandwich-type electrochemiluminescence (ECL) immunosensor was fabricated for insulin detection. Au-ZnCd14S combined nitrogen doping mesoporous carbons (Au-ZnCd14S/NH2-NMCs) acted as sensing platform and Au-Cu alloy nanocrystals were employed as labels to quench the ECL of Au-ZnCd14S/NH2-NMCs. Zinc-doping promoted the ECL behavior of CdS nanocrystals, with the best ECL emission obtained when the molar ratio of Zn/Cd was 1:14. Simultaneously, the modification of gold nanoparticles (Au NPs) and combination with NH2-NMC further enhanced the ECL emission of ZnCd14S due to its excellent conductivity and large specific surface area, which is desirable for the immunosensor construction. Au-Cu alloy nanocrystals were employed in the ECL system of ZnCd14S/K2S2O8 triggering ECL quenching effects. The ECL spectra of ZnCd14S, acting as the energy donor, exhibited well overlaps with the absorption band of Au-Cu alloy nanocrystals which acted as the energy acceptor, leading to an effective ECL resonance energy transfer (ECL-RET). On the basis of the ECL quenching effects, a sensitive ECL immunosensor for insulin detection was successfully constructed with a linear response range of insulin concentration from 0.1pg/mL to 30ng/mL and the limit of detection was calculated to be 0.03pg/mL (S/N = 3).

KEYWORDS:

Au-Cu alloy nanocrystals; Electrochemiluminescence immunosensor; Insulin; Zinc-doping cadmium sulfide

PMID:
28582706
DOI:
10.1016/j.bios.2017.05.046
[Indexed for MEDLINE]

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