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Oxidation of Phenols to Quinones

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
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Polyphenol Oxidase-Like Nanozymes.

Haolun Gu1,2, Jingqi Li1,2, Pengyu Dai1,2

  • 1College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, 150040, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|August 23, 2025
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Summary

Polyphenol oxidase-like (PPO-like) nanozymes are emerging as powerful tools in nanozymology. This review comprehensively covers their design, mechanisms, applications, and biomedical potential, aiming to accelerate clinical translation.

Keywords:
biomedical applicationscatalytic mechanismsclassificationdata‐driven designpolyphenol oxidase‐like nanozymes

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Catalysis

Background:

  • Nanozymes are nanomaterials exhibiting enzyme-like catalytic activities.
  • Polyphenol oxidase-like (PPO-like) nanozymes represent a significant subgroup with unique design principles and catalytic mechanisms.
  • Research on PPO-like nanozymes has rapidly expanded, highlighting their growing importance in nanozymology.

Purpose of the Study:

  • To provide a comprehensive overview of the current research status of PPO-like nanozymes.
  • To systematically summarize their classification, activity modulation, catalytic mechanisms, and interdisciplinary applications.
  • To analyze the biomedical prospects and challenges for clinical translation of PPO-like nanozymes.

Main Methods:

  • Literature review and synthesis of existing research on PPO-like nanozymes.
  • Analysis of design philosophies and catalytic mechanisms.
  • In-depth examination of biomedical applications, safety, and scalability.

Main Results:

  • PPO-like nanozymes possess a well-defined design philosophy and catalytic mechanism.
  • They demonstrate diverse interdisciplinary applications and significant biomedical potential.
  • Key aspects for clinical translation, including in vivo safety and regulatory barriers, have been identified.

Conclusions:

  • PPO-like nanozymes offer unique advantages for biomedical treatments, drawing inspiration from natural enzymes.
  • A data-driven approach can guide the rational design of these nanozymes.
  • Continued advancement and translation into the biomedical field are anticipated, addressing current challenges.