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<p>A simple and sensitive electrochemical sensor based on a thiourea-modified platinum electrode (TU–Pt) was developed for the quantitative determination of catechol (CC) in tea samples. For the detection of catechol (CC) in tea samples, a straightforward and sensitive electrochemical sensor based on a thiourea-modified platinum electrode (TU–Pt) was created. Cyclic voltammetry and SEM-EDX analysis verified the surface modification, indicating improved electroactive surface characteristics of the TU-Pt electrode. At roughly 0.50&#xa0;V, catechol showed a distinct oxidation peak in differential pulse voltammetry. The suggested sensor had a detection limit of 0.05 µM and a broad linear range of 1.0 µM to 5.0 mM with good linearity (R2 = 0.998). Corresponding with recovery values (83.94 − 86.71%) observed in green tea samples, slope comparison analysis revealed considerable matrix-induced signal suppression (~ 14%). In complex tea matrices, these findings validate that the TU–Pt electrode provide a dependable and diffusion-controlled platform for catechol measurement. The potential for practical applications of thiourea modification is highlighted by its simplicity of use and excellent analytical performance.</p> Graphical abstract <p></p>

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A thiourea-modified platinum electrode for sensitive and selective detection of catechol in tea samples

  • 期刊论文

  • 发表日期：

    2026年5月2日

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  • Mohammad Amayreh,
  • Muayad Esaifan,
  • Anas Rasras,
  • Mohammad Alzubi

摘要

A simple and sensitive electrochemical sensor based on a thiourea-modified platinum electrode (TU–Pt) was developed for the quantitative determination of catechol (CC) in tea samples. For the detection of catechol (CC) in tea samples, a straightforward and sensitive electrochemical sensor based on a thiourea-modified platinum electrode (TU–Pt) was created. Cyclic voltammetry and SEM-EDX analysis verified the surface modification, indicating improved electroactive surface characteristics of the TU-Pt electrode. At roughly 0.50 V, catechol showed a distinct oxidation peak in differential pulse voltammetry. The suggested sensor had a detection limit of 0.05 µM and a broad linear range of 1.0 µM to 5.0 mM with good linearity (R2 = 0.998). Corresponding with recovery values (83.94 − 86.71%) observed in green tea samples, slope comparison analysis revealed considerable matrix-induced signal suppression (~ 14%). In complex tea matrices, these findings validate that the TU–Pt electrode provide a dependable and diffusion-controlled platform for catechol measurement. The potential for practical applications of thiourea modification is highlighted by its simplicity of use and excellent analytical performance.

Graphical abstract