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<p>Herein, we demonstrate that pristine Co-based ZIF-9 exhibits exceptional peroxidase-mimicking activity, catalyzing the oxidation of o-phenylenediamine as a model substrate in the presence of H<sub>2</sub>O<sub>2</sub>. The nanozyme shows a maximum reaction rate (<i>V</i><sub>max</sub>) of 3.66 ± 0.10 × 10<sup>–5</sup> (M/s) which is 10<sup>3</sup>-fold higher than horseradish peroxidase (HRP). A simple, rapid, and low-cost colorimetric sensor platform for the detection of H<sub>2</sub>O<sub>2</sub> was also developed, demonstrating a linear range of 10<sup>−4</sup> − 1.4 × 10<sup>–3</sup>&#xa0;M and a detection limit of 0.94 × 10<sup>−5</sup>&#xa0;M (S/N = 3).</p>

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Kinetic analysis of pristine ZIF-9 as a peroxidase mimic: from substrate oxidation to H2O2 detection

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Zohre Ebrahimpoor,
  • Zeinab Moradi–Shoeili

摘要

Herein, we demonstrate that pristine Co-based ZIF-9 exhibits exceptional peroxidase-mimicking activity, catalyzing the oxidation of o-phenylenediamine as a model substrate in the presence of H2O2. The nanozyme shows a maximum reaction rate (Vmax) of 3.66 ± 0.10 × 10–5 (M/s) which is 103-fold higher than horseradish peroxidase (HRP). A simple, rapid, and low-cost colorimetric sensor platform for the detection of H2O2 was also developed, demonstrating a linear range of 10−4 − 1.4 × 10–3 M and a detection limit of 0.94 × 10−5 M (S/N = 3).