Microchimica Acta

, 186:817 | Cite as

Electrochemiluminescent immunoassay for neuron specific enolase by using amino-modified reduced graphene oxide loaded with N-doped carbon quantum dots

  • Xiangfei Zheng
  • Guichun Mo
  • Yongyu He
  • Dongmiao Qin
  • Xiaohua Jiang
  • Weiming Mo
  • Biyang DengEmail author
Original Paper


An ultrasensitive electrochemiluminescence based sandwich immunoassay is presented for determination of neuron specific enolase. The method uses silver-cysteine nanowires as the capture probe and a composite made of amino-modified reduced graphene oxide and nitrogen-doped carbon quantum dots as the signal probe. It was synthesized by covalent coupling of amino-modified reduced graphene oxide to the carboxy groups of nitrogen-doped carbon quantum dots. The nanowires possess a large specific surface and abundant functional groups which facilitate immobilizing the primary antibody (Ab1). The amino-modified reduced graphene oxide is employed as a carrier for loading a large number of the quantum dots and secondary antibody (Ab2). This increases the electrochemiluminescence intensity of quantum dots. Response to neuron specific enolase is linear in the 0.55 fg·mL−1 to 5.5 ng·mL−1 concentration range. It has a detection limit of 0.18 fg·mL−1 (at S/N = 3). The relative standard deviation (for n = 6) is less than 2.9%. The assay is highly sensitive, reproducible, selective and stable.

Graphical abstract

A novel electrochemiluminescence immunosensor is described that uses amino-modified reduced graphene oxide (amino-rGO), nitrogen-doped carbon quantum dots (N-CQDs) and silver-cysteine nanowires (SCNWs). It was applied to the determination of neuron specific enolase (NSE). Bovine serum albumin: BSA;1-ethyl-3-(3-dimethylaminopropyl)carbodiimide: (EDC;, N-hydroxysuccinimide: NHS.


Sensor Carbon quantum dots Graphene oxide Silver-cysteine nanowires Neuron specific enolase 



This work was financially supported by the National Natural Science Foundation of China (No. 21765004). Support from Research Fund of State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Guangxi Normal University) (CMEMR2017-A5, CMEMR2018-C18) is gratefully acknowledged.

Compliance with ethical standards

Competing interests

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

Supplementary material

604_2019_3986_MOESM1_ESM.docx (5 mb)
ESM 1 (DOCX 5148 kb)


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Copyright information

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

Authors and Affiliations

  1. 1.State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilinChina

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