Sr-doped MnO2 with enhanced dual-enzyme mimetic activity for colorimetric detection of glutathione and 2,4-dichlorophenol

IF 4.9 2区化学 Q1 CHEMISTRY, ANALYTICAL Microchemical Journal Pub Date : 2025-03-01 DOI:10.1016/j.microc.2025.113166

Wei Shi , Xueyi Wang , Zhouping Yang , Jun Yang , Xiaoying Fu , Xianxiang Wang

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Abstract

The development of simple and rapid colorimetric methods for monitoring food nutrition and safety is essential for sustaining life and promoting health. Nanozymes, which exhibit high stability and multi-enzyme activity, hold significant promise for widespread applications in colorimetric analysis. In this work, we successfully synthesized strontium-doped MnO₂ nanoflowers (Sr-MnO₂ NFs) that exhibit both oxidase-like and laccase-like activities. The oxidase activity and laccase activity of the Sr-MnO₂ NFs were 2.12 and 3 times greater than those of MnO₂ nanorods (MnO₂ NRs), respectively. Oxygen vacancies (Ov) and O₂⁻ play a key role in oxidase-like and laccase-like enzymes. Leveraging the excellent catalytic properties of these activities, we developed a simple, fast and highly sensitive colorimetric detection method for glutathione (GSH) and 2,4-dichlorophenol (2,4-DP), achieving low detection limits of 0.46 μM and 0.992 μM, respectively. Furthermore, the proposed method has been successfully applied to the determination of GSH and 2,4-DP in food samples.

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来源期刊

Microchemical Journal 化学-分析化学

CiteScore

8.70

自引率

8.30%

发文量

1131

审稿时长

1.9 months

期刊介绍： The Microchemical Journal is a peer reviewed journal devoted to all aspects and phases of analytical chemistry and chemical analysis. The Microchemical Journal publishes articles which are at the forefront of modern analytical chemistry and cover innovations in the techniques to the finest possible limits. This includes fundamental aspects, instrumentation, new developments, innovative and novel methods and applications including environmental and clinical field. Traditional classical analytical methods such as spectrophotometry and titrimetry as well as established instrumentation methods such as flame and graphite furnace atomic absorption spectrometry, gas chromatography, and modified glassy or carbon electrode electrochemical methods will be considered, provided they show significant improvements and novelty compared to the established methods.