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Related Concept Videos

Redox Reactions01:24

Redox Reactions

Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...

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  1. Home
  3. Interfacial Redox Recycling Nanocatalysts With Ultrahigh Peroxidase Activity For Colorimetric Sensing Applications.
  1. Home
  3. Interfacial Redox Recycling Nanocatalysts With Ultrahigh Peroxidase Activity For Colorimetric Sensing Applications.

Related Experiment Video

Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
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Interfacial Redox Recycling Nanocatalysts with Ultrahigh Peroxidase Activity for Colorimetric Sensing Applications.

Santimukul Santra1,2, Eniola Arogunyo2, Rahab Kanogo1

  • 1Department of Chemistry and Biochemistry, Missouri State University, 901 S. National Avenue, Springfield, Missouri 65897, United States.

ACS Applied Nano Materials
|June 18, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Researchers engineered plasmonic nanoceria (PNC) to significantly boost peroxidase-mimetic activity, achieving 1000-fold higher efficiency than natural enzymes. This advancement enables more sensitive pathogen detection in assays.

Keywords:
E. coli O157:H7density functional theorynanozymeplasmonic nanoceriaredox recycling

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Area of Science:

  • Nanomaterials Science
  • Catalysis
  • Biomedical Engineering

Background:

  • Conventional nanoscale peroxidase mimics suffer from low catalytic activity, limiting their practical applications.
  • Precise engineering of physicochemical properties is crucial for enhancing catalytic efficiency in nanomaterials.
  • Mixed redox-state nanomaterials offer potential for improved peroxidase-mimetic performance.

Purpose of the Study:

  • To develop an efficient strategy for substantially improving the peroxidase-mimetic activity of nanomaterials.
  • To synthesize and characterize plasmonic nanoceria (PNC) as a novel redox-active nanostructure.
  • To investigate the enhanced catalytic efficiency and application of PNC in biosensing.

Main Methods:

  • Synthesis of plasmonic nanoceria (PNC) nanostructures with a cerium oxide core and encapsulated gold nanoparticles within a poly-(acrylic acid) coating.
  • Characterization of PNC's catalytic activity, including kinetic analysis (Kcat) over a wide range of temperatures and pH.
  • Density functional theory (DFT) calculations to elucidate the mechanism of enhanced activity.
  • Application of PNC as a peroxidase mimic in an enzyme-linked immunosorbent assay (ELISA) for pathogen detection.

    • Main Results:

    • PNC nanostructures exhibited significantly enhanced peroxidase-mimetic activity with a Kcat value of 10^6 s^-1, 1000-fold higher than natural enzymes.
    • Catalytic activity of PNC remained robust across a broad spectrum of temperatures and pH conditions.
    • DFT calculations confirmed that efficient electron transfer between gold and cerium atoms in PNC is responsible for the boosted catalytic activity.
    • PNC-based ELISA assays achieved lower limits of detection for Escherichia coli O157:H7 compared to conventional assays.

    Conclusions:

    • Engineered plasmonic nanoceria demonstrate superior peroxidase-mimetic activity and stability, outperforming natural enzymes.
    • The enhanced catalytic efficiency is attributed to the synergistic electronic interactions within the PNC nanostructures.
    • PNC holds significant promise as a highly sensitive and versatile tool for advanced biosensing applications, particularly for pathogen detection.