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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

654
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
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Hydrogen Production and Utilization in a Membrane Reactor
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Bioelectrocatalysis with a palladium membrane reactor.

Aiko Kurimoto1, Seyed A Nasseri1, Camden Hunt1,2

  • 1Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada.

Nature Communications
|March 31, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel palladium membrane reactor for efficient electrochemical regeneration of nicotinamide adenine dinucleotide (NADH) from NAD+. This bioelectrocatalytic system overcomes previous limitations, enabling sustainable enzyme catalysis powered by clean electricity.

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Area of Science:

  • Biocatalysis
  • Electrochemistry
  • Chemical Engineering

Background:

  • Enzyme catalysis produces significant value-added chemicals, with many processes relying on expensive nicotinamide adenine dinucleotide (NAD+) / nicotinamide adenine dinucleotide (NADH) cofactors.
  • Regenerating NADH efficiently and sustainably is crucial for cost-effective biocatalysis.
  • Existing electrocatalytic NADH regeneration methods face challenges like cofactor degradation, high energy requirements, and mediator use.

Purpose of the Study:

  • To develop a novel bioelectrocatalytic system for efficient and stable NADH regeneration from NAD+.
  • To overcome the limitations of existing electrocatalytic NADH regeneration techniques.
  • To enable enzyme catalysis to be driven by clean electricity.

Main Methods:

  • Utilized a bioelectrocatalytic palladium membrane reactor.
  • Separated the enzymatic and electrolytic compartments using a hydrogen-permselective palladium membrane.
  • Investigated the mechanism of NADH regeneration, identifying hydride as the key intermediate sourced from water.

Main Results:

  • Successfully regenerated NADH from NAD+ using the palladium membrane reactor.
  • Bypassed radical-induced NAD+ degradation by separating reaction compartments.
  • Achieved NADH regeneration independent of water electrolysis conditions, optimizing enzymatic reactions.
  • Demonstrated a system utilizing clean electricity with oxygen as the primary byproduct.

Conclusions:

  • The developed palladium membrane reactor offers a robust and efficient solution for electrochemical NADH regeneration.
  • This bioelectrocatalytic approach facilitates sustainable enzyme catalysis powered by renewable electricity.
  • The system minimizes cofactor degradation and allows for independent optimization of reaction conditions.