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Radical Autoxidation01:20

Radical Autoxidation

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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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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Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Radical Reactivity: Overview01:11

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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Use of Electron Paramagnetic Resonance in Biological Samples at Ambient Temperature and 77 K
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Quantum Zeno Effect Permits Magnetosensitivity in Lipid Peroxidation despite Fluctuating Inter-Radical Coupling.

Matt C J Denton1,2, Daniel R Kattnig1,2

  • 1Living Systems Institute, University of Exeter, Stocker Road, Exeter, Devon EX4 4QD, U.K.

JACS Au
|May 1, 2026
PubMed
Summary

Magnetic fields influence lipid peroxidation, a key process in aging and disease. Our study shows these effects persist even with strong interactions in biological membranes, suggesting broader potential for magnetosensitivity.

Keywords:
Brownian motionlipid peroxidationmagnetic field effectsquantum Zeno effectradical pair mechanism

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Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Biophysics

Background:

  • Lipid peroxidation is an oxidative process central to cellular aging, ferroptosis, and various pathologies, often associated with oxidative stress.
  • Growing evidence suggests lipid peroxidation is sensitive to weak magnetic fields, with the radical pair mechanism (RPM) as a proposed explanation.
  • Previous RPM studies used simple models, lacking evaluation under biologically realistic conditions with strong inter-radical interactions.

Purpose of the Study:

  • To investigate the impact of dynamic inter-radical dipolar coupling on magnetic field sensitivity in lipid peroxidation chain termination reactions.
  • To evaluate the efficacy of the radical pair mechanism (RPM) under biologically relevant conditions, considering strong inter-radical interactions.

Main Methods:

  • Utilized Brownian dynamics-informed spin dynamics calculations to model the system.
  • Investigated the effects of dynamic inter-radical dipolar coupling on magnetic field sensitivity.
  • Analyzed the influence of recombination rate constants and spin relaxation mechanisms (g-matrix anisotropy).

Main Results:

  • Weak magnetic field effects persist in lipid peroxidation despite strong, fluctuating dipolar interactions, contingent on fast spin-selective radical recombination (quantum Zeno effect).
  • Recombination quantum yield shows strong dependence on the recombination rate constant, influencing low-field effects, high-field sensitivity, or magnetic responsiveness.
  • At high magnetic fields, g-matrix anisotropy-driven spin relaxation can lead to pronounced magnetosensitivity for fast recombination processes.

Conclusions:

  • Magnetic field effects are viable in strongly coupled radical pairs within biological membranes under specific dynamical and kinetic constraints.
  • The study highlights potential for broader magnetosensitivity in confined, low-mobility biological environments than predicted by standard RPM models.
  • Findings suggest magnetic fields could modulate biological processes like lipid peroxidation, with implications for understanding aging and disease.