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An ultra-sensitive electrochemical sensor for ascorbic acid based on click chemistry.

Suyan Qiu1, Sen Gao, Lidan Xie

  • 1MOE Key Laboratory of Analysis and Detection for Food Safety, Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350002, China.

The Analyst
|August 10, 2011
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Summary

A novel electrochemical sensor utilizing copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) enables highly sensitive detection of ascorbic acid (AA). This method offers a low detection limit for AA analysis in biological samples.

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Area of Science:

  • Electrochemistry
  • Chemical Sensors
  • Analytical Chemistry

Background:

  • Ascorbic acid (AA) plays a crucial role in biological systems, necessitating accurate quantification methods.
  • Existing electrochemical sensors often face challenges with selectivity and sensitivity for AA detection.
  • Copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) offers a versatile platform for sensor development.

Purpose of the Study:

  • To develop a highly selective and sensitive electrochemical sensor for ascorbic acid (AA) assay.
  • To utilize the CuAAC reaction for the quantitative modification of an electrode surface.
  • To establish a reliable method for AA detection in biological matrices.

Main Methods:

  • Preparation of an azide-modified gold (Au) electrode surface.
  • In situ generation of the Cu(I) catalyst via reduction of Cu(II) by AA.
  • Electrochemical detection using differential pulse voltammetry (DPV) after CuAAC reaction with propargyl-functionalized ferrocene.

Main Results:

  • The electrochemical sensor demonstrated a linear response to AA concentration logarithmically in the range of 5.0 × 10⁻¹² to 1.0 × 10⁻⁹ M.
  • The sensor exhibited high selectivity, good stability (RSD 4.2%), and a low limit of detection for AA.
  • Successful application of the sensor for detecting AA in real urine samples was achieved.

Conclusions:

  • A novel electrochemical sensor based on CuAAC reaction provides a sensitive and selective platform for AA quantification.
  • The in situ generated Cu(I) catalyst and ferrocene-based signal amplification contribute to the sensor's performance.
  • The developed sensor shows potential for practical application in analyzing AA levels in biological fluids.