Non-enzymatic colorimetric strategy for malathion detection based on Pt nanoparticles decorated porphyrin Zr metal-organic framework spheres.

IF 6.7 1区化学 Q1 CHEMISTRY, ANALYTICAL Talanta Pub Date : 2027-02-01 Epub Date: 2026-08-06 DOI:10.1016/j.talanta.2026.130413

Qing Zhang, Kuizhi Li, Wanzhu Wang, Danhua Ge, Xiaojun Chen

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Abstract

The presence of malathion (Mal) residues in food and water environment have garnered widespread public concern. Here, we developed PCN-224-supported Pt nanozymes through an in-situ reduction method, where the porous porphyrin framework and Pt sites jointly promote electron transfer and provide more active centers, leading to drastically enhanced oxidase (OXD)-mimicking activity. The obtained PCN-224@Pt can directly oxidize colorless TMB to blue oxTMB without H₂O₂, while the specific adsorption of Mal on the nanozyme surface will shield active sites and inhibit the catalytic reaction. Accordingly, a colorimetric sensor was then established to achieve sensitive determination of Mal in a linear detection range from 0.01 to 2.5 μg/mL with a low detection limit (LOD) of 6.62 ng/mL. Moreover, this platform displayed high selectivity and stability in food and water samples, with satisfactory recoveries of 90.1 %-107.7 % (RSDs < 9.31 %). This strategy provides a new attempt to construct nanozyme probes for direct detection of Mal, suitable for visual analysis in food and water environments.

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基于Pt纳米粒子修饰卟啉Zr金属-有机骨架球的马拉硫磷非酶比色检测策略。

马拉硫磷在食品和水环境中的残留已经引起了公众的广泛关注。在这里，我们通过原位还原方法开发了pcn -224负载的Pt纳米酶，其中多孔卟啉框架和Pt位点共同促进电子转移并提供更多的活性中心，从而大大增强了氧化酶（OXD）模拟活性。所得PCN-224@Pt可以直接将无色TMB氧化为无H2O2的蓝色TMB，而Mal在纳米酶表面的特异性吸附会屏蔽活性位点，抑制催化反应。建立比色传感器，在0.01 ~ 2.5 μg/mL的线性检测范围内对Mal进行灵敏检测，低检出限为6.62 ng/mL。该平台在食品和水样品中具有较高的选择性和稳定性，加样回收率为90.1 % ~ 107.7 % （rsd < 9.31 %）。该策略为构建直接检测Mal的纳米酶探针提供了新的尝试，适用于食品和水环境中的视觉分析。

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来源期刊

Talanta 化学-分析化学

CiteScore

12.30

自引率

4.90%

发文量

861

审稿时长

29 days

期刊介绍： Talanta provides a forum for the publication of original research papers, short communications, and critical reviews in all branches of pure and applied analytical chemistry. Papers are evaluated based on established guidelines, including the fundamental nature of the study, scientific novelty, substantial improvement or advantage over existing technology or methods, and demonstrated analytical applicability. Original research papers on fundamental studies, and on novel sensor and instrumentation developments, are encouraged. Novel or improved applications in areas such as clinical and biological chemistry, environmental analysis, geochemistry, materials science and engineering, and analytical platforms for omics development are welcome. Analytical performance of methods should be determined, including interference and matrix effects, and methods should be validated by comparison with a standard method, or analysis of a certified reference material. Simple spiking recoveries may not be sufficient. The developed method should especially comprise information on selectivity, sensitivity, detection limits, accuracy, and reliability. However, applying official validation or robustness studies to a routine method or technique does not necessarily constitute novelty. Proper statistical treatment of the data should be provided. Relevant literature should be cited, including related publications by the authors, and authors should discuss how their proposed methodology compares with previously reported methods.