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Microchimica Acta

, 186:280 | Cite as

Ratiometric fluorescent immunoassay for the cardiac troponin-I using carbon dots and palladium-iridium nanocubes with peroxidase-mimicking activity

  • Xiaofeng Tan
  • Lianhua Zhang
  • Qiaorong Tang
  • Gengxiu ZhengEmail author
  • He LiEmail author
Original Paper
  • 54 Downloads

Abstract

A nanozyme-linked immunosorbent assay is described for cardiac troponin I which is a biomarker for myocardial infarction. The method is based on the use of Pd-Ir nanocubes with excellent peroxidase-like activity. The nanocubes catalyze the oxidization of nonfluorescent o-phenylenediamine (OPD) by H2O2 to form a yellow fluorescent product (oxOPD) with excitation/emission maxima at 400/570 nm. Carbon dots are added as a reference fluorophore. Under the same excitation wavelength, they display blue fluorescence (450 nm). The ELISA uses the Pd-Ir nanocubes as a label for the secondary antibody and OPD as substrate. The ratio of fluorescence intensities at 570 and 450 nm increases in the 1 pg·mL−1 to 1 ng·mL−1 cardiac troponin I concentration range, and the detection limit is 0.31 pg·mL−1. The method was applied to analyze spiked serum samples, and the results compared well with those obtained by a commercial chemiluminescence assay.

Graphical abstract

Schematic presentation of the ratiometric fluorescence immunoassay for cardiac troponin-I. Pd-Ir nanocubes were employed to fabricate nanozyme-based signal labels for its excellent peroxidase-mimicking activity.

Keywords

Heart attack biomarker Sandwich immunoassay Ratiometric method Improved ELISA Core-shell structure Ultrasensitive detection Nanozymes Clinical diagnosis Metal alloys O-phenylenediamine 

Notes

Acknowledgments

This study was supported by the Natural Science Foundation of Shandong Province, China (No. ZR2017MB017) and the Natural Science Foundation of China (No. 21245007 and 81000976).

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2019_3375_MOESM1_ESM.docx (642 kb)
ESM 1 (DOCX 641 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Chemistry and Chemical Engineering, and Institute of Surface Analysis and Chemical BiologyUniversity of JinanJinanChina
  2. 2.Renji HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
  3. 3.College of Optoelectronics TechnologyChengdu University of Information TechnologyChengduChina

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