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NIR-Responsive AuAgPt Plasmonic Nanozyme: Colorimetric/Photothermal Dual-Signal Sensing Array for Discriminating and

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A novel gold-silver-platinum nanozyme detects sulfur-containing compounds (SCCs) using near-infrared light. This advanced sensor accurately identifies five key SCCs in food, ensuring safety.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Accurate detection of sulfur-containing compounds (SCCs) is critical for food safety.
  • Existing methods may lack sensitivity or specificity for complex food matrices.

Purpose of the Study:

  • To engineer a near-infrared (NIR)-responsive gold-silver-platinum (AuAgPt) ternary metallic plasmonic nanozyme.
  • To develop a sensitive and specific sensing platform for discriminating key SCCs in food.

Main Methods:

  • Fabrication of a ternary metallic plasmonic nanozyme with broad NIR-I/II absorption.
  • Exploitation of synergistic enhancement of peroxidase-like activity via hot carriers, electron transfer, and photothermal effects.
  • Construction of a colorimetric/photothermal sensing array coupled with linear discriminant analysis.

Main Results:

  • The nanozyme demonstrated enhanced peroxidase-like activity under NIR irradiation.
  • A sensing array successfully discriminated five SCCs (sodium sulfide, sodium thiosulfate, glutathione, dithiothreitol, cysteine) at micromolar sensitivities.
  • The method was validated in egg and milk matrices with high recovery rates (87.89-105.2%).

Conclusions:

  • The engineered AuAgPt plasmonic nanozyme provides a robust platform for distinguishing structurally analogous SCCs.
  • The dual-signal amplification strategy offers a sensitive and selective approach for SCC analysis in complex food samples.
  • This work highlights a multimetallic plasmonic nanozyme design for advanced analytical applications.