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Microchimica Acta

, Volume 182, Issue 1–2, pp 409–417 | Cite as

Aptamer-based electrochemical assay of 17β-estradiol using a glassy carbon electrode modified with copper sulfide nanosheets and gold nanoparticles, and applying enzyme-based signal amplification

  • Ke-Jing HuangEmail author
  • Yu-Jie Liu
  • Ji-Zong Zhang
Original Paper

Abstract

We have developed an electrochemical method for the determination of 17β-estradiol. A glassy carbon electrode was modified with a composite made from copper sulfide nanosheets, gold nanoparticles, and glucose oxidase. The copper sulfide nanosheet was prepared by a single-step hydrothermal process, and its properties were characterized by X-ray powder diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy. Finally, an estradiol-specific aptamer was assembled on the electrode. The copper sulfide nanosheet on the electrode surface acts as a relatively good electrical conductor. Glucose oxidase acts as an indicator, and the dual modification of glucose oxidase and gold nanoparticles for signal amplification. The determination of 17β-estradiol was performed by differential pulse voltammetry of glucose oxidase because the signal measured at typically −0.43 V depends on the concentration of 17β-estradiol because addition of 17β-estradiol at electrode hinders electron transfer. A linear relationship exists between the peak current and the logarithm of concentration of 17β-estradiol in the 0.5 pM to 5 nM range, with a 60 f. detection limit (at 3σ/S). The method displays good selectivity over bisphenol A, 1-aminoanthraquinone and naphthalene even if present in 100-fold concentrations.

Graphical Abstract

We present an electrochemical method for the determination of 17β-estradiol, using a glassy carbon electrode modified with copper sulfide nanosheets, gold nanoparticles and glucose oxidase as an indicator. The method displays good selectivity over bisphenol A, 1-aminoanthraquinone and naphthalene even if present in 100-fold concentrations.

Keywords

Copper sulfide nanosheet Au nanoparticles 17β-estradiol Glucose oxidase Signal amplification 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (U1304214) and the State Key Laboratory of Chemo/biosensing and Chemometrics (No.2013013).

Supplementary material

604_2014_1352_MOESM1_ESM.pdf (33 kb)
ESM 1 (PDF 33.3 kb)

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Copyright information

© Springer-Verlag Wien 2014

Authors and Affiliations

  1. 1.College of Chemistry and Chemical EngineeringXinyang Normal UniversityXinyangChina
  2. 2.State Key Laboratory of Chemo/biosensing and Chemometrics, College of Chemistry and Chemical EngineeringHunan UniversityChangshaChina

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