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<p>A&#xa0;colorimetric/fluorescent dual-mode sensor has been developed&#xa0;based on well-dispersed PtMn alloy/porous N-doped carbon nanoflowers (PtMn/CNFs), which have bifunctional ascorbate oxidase (AAO) and peroxidase (POD)-like activities. Specifically, the POD-like activity of PtMn/CNFs enables colorimetric ascorbic acid (AA) detection by oxidizing 3,3′,5,5′-tetramethylbenzidine (TMB) to a blue product, while the AAO-like activity facilitates fluorescent detection of AA by catalyzing its oxidation to dehydroascorbic acid (DHA), which subsequently reacts with o-phenylenediamine (OPD) to generate a fluorescent product. The sensor demonstrates wide linear ranges of 2 to 250&#xa0;µM (detection limit: 0.218&#xa0;µM) and 2.5–500&#xa0;µM (detection limit: 0.101&#xa0;µM) for colorimetric and fluorescent AA detection, respectively. This was successfully applied to AA detection in juice beverages and showed high accuracy with satisfying results. This work offers a simple, reliable, and efficient strategy for monitoring food quality.</p> Graphical Abstract <p></p>

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Well-defined PtMn alloy/porous N-doped carbon nanoflowers with bifunctional activities for colorimetric/fluorescent dual-mode determination of ascorbic acid in juice beverages

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Yuan-Yuan Chen,
  • Jia-Xi Sun,
  • Ai-Jun Wang,
  • Li-Ping Mei,
  • Pei Song,
  • Tiejun Zhao,
  • Jiu-Ju Feng

摘要

A colorimetric/fluorescent dual-mode sensor has been developed based on well-dispersed PtMn alloy/porous N-doped carbon nanoflowers (PtMn/CNFs), which have bifunctional ascorbate oxidase (AAO) and peroxidase (POD)-like activities. Specifically, the POD-like activity of PtMn/CNFs enables colorimetric ascorbic acid (AA) detection by oxidizing 3,3′,5,5′-tetramethylbenzidine (TMB) to a blue product, while the AAO-like activity facilitates fluorescent detection of AA by catalyzing its oxidation to dehydroascorbic acid (DHA), which subsequently reacts with o-phenylenediamine (OPD) to generate a fluorescent product. The sensor demonstrates wide linear ranges of 2 to 250 µM (detection limit: 0.218 µM) and 2.5–500 µM (detection limit: 0.101 µM) for colorimetric and fluorescent AA detection, respectively. This was successfully applied to AA detection in juice beverages and showed high accuracy with satisfying results. This work offers a simple, reliable, and efficient strategy for monitoring food quality.

Graphical Abstract