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Electron-Mediator-Free Microfluidic Photocatalytic Coenzyme Regeneration with 100% Conversion Efficiency within 126

Yao Chai1, Liang Wan1, Zirui Pang1

  • 1Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, Kowloon, 999077, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 7, 2025
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Summary

This study presents a novel microfluidic platform for efficient photocatalytic regeneration of nicotinamide adenine dinucleotide (NADH). The system achieves rapid and selective NAD+ conversion using bismuth oxybromide nanosheets, demonstrating remarkable stability for biocatalysis applications.

Keywords:
BiOBr nanosheetsNAD(P)H regenerationelectron mediatorsmicrofluidicsphotocatalysis

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Area of Science:

  • Photocatalysis
  • Microfluidics
  • Biocatalysis

Background:

  • Microfluidic systems offer enhanced mass/energy transfer and parameter control for improved photocatalytic efficiency.
  • Photocatalytic regeneration of coenzymes like NAD(P)H is crucial for various biocatalytic and synthetic biology applications.

Purpose of the Study:

  • To design an electron-mediator-free microfluidic platform for efficient photocatalytic coenzyme NAD(P)H regeneration.
  • To integrate ultrathin bismuth oxybromide (BiOBr) nanosheets into the microfluidic system.
  • To achieve direct electron-proton coupling for NAD+ conversion.

Main Methods:

  • Fabrication of a microfluidic device integrating ultrathin BiOBr nanosheets.
  • Utilizing the platform for photocatalytic regeneration of NAD+ to NADH.
  • Investigating the conversion efficiency, selectivity, and operational stability of the system.

Main Results:

  • Achieved 100% NAD+ conversion within 126 seconds.
  • Demonstrated high selectivity (72.30%) for the bioactive 1,4-NADH isomer.
  • Exhibited no activity decay during continuous operation for over 32 hours, indicating excellent stability.

Conclusions:

  • The developed microfluidic platform provides a benchmark for integrated photocatalytic systems.
  • The system shows significant potential for applications in biocatalysis, synthetic biology, and renewable energy.
  • Highlights the effectiveness of electron-mediator-free design and BiOBr nanosheets for coenzyme regeneration.