On the magnetosensitivity of lipid peroxidation: two- versus three-radical dynamics

2019 · Unclear · Insufficient evidence

← Research stream

UnclearInsufficient evidencePaper 1763

Study snapshot

Publicationmanual · 2019

Study typeother

Reported directionUnclear

Evidence ratingInsufficient

Abstract

On the magnetosensitivity of lipid peroxidation: two- versus three-radical dynamics Sampson C, Keens RH , Kattnig DR. On the magnetosensitivity of lipid peroxidation: two- versus three-radical dynamics. Phys Chem Chem Phys. 2019 Jun 26;21(25): 13526-13538. doi: 10.1039/c9cp01746a. Abstract We present a theoretical analysis of the putative magnetosensitivity of lipid peroxidation. We focus on the widely accepted radical pair mechanism (RPM) and a recently suggested idea based on spin dynamics induced in three-radical systems by the mutual electron-electron dipolar coupling (D3M). We show that, contrary to claims in the literature, lipid peroxides, the dominant chain carriers of the autoxidation process, have associated non- zero hyperfine coupling interactions. This suggests that their recombination could, in principle, be magnetosensitive due to the RPM. While the RPM indeed goes a long way to explaining magnetosensitivity in these systems, we show that the simultaneous interaction of three peroxyl radicals via the D3M can achieve larger magnetic field effects (MFE), even if the third radical is remote from the recombining radical pair. For randomly oriented three-radical systems, the D3M induces a low-field effect comparable to that of the RPM. The mechanism furthermore immunizes the spin dynamics to the presence of large exchange coupling interactions in the recombining radical pair, thereby permitting much larger MFE at magnetic field intensities comparable to the geomagnetic field than would be expected for the RPM. Based on these characteristics, we suggest that the D3M could be particularly relevant for MFE at low fields, provided that the local radical concentration is sufficient to allow for three-spin radical correlations. Eventually, our observations suggest that MFEs could intricately depend on radical concentration and larger effects could ensue under conditions of oxidative stress. ncbi.nlm.nih.gov

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeother

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

The paper presents a theoretical analysis of magnetosensitivity in lipid peroxidation, comparing the radical pair mechanism (RPM) with a three-radical dipolar coupling mechanism (D3M). It argues lipid peroxyl radicals have non-zero hyperfine couplings, implying recombination could be magnetosensitive via RPM, and concludes D3M interactions among three peroxyl radicals could produce larger magnetic field effects at low (geomagnetic-comparable) field intensities and be less limited by exchange coupling in the recombining radical pair.

Outcomes measured

magnetic field effects (MFE) on lipid peroxidation radical dynamics
magnetosensitivity via radical pair mechanism (RPM)
magnetosensitivity via three-radical dipolar coupling mechanism (D3M)

Limitations

The work is a theoretical analysis; no experimental exposure conditions (frequency, intensity) are specified in the abstract.
No human/animal population or sample size is described.
Relevance is conditional on sufficient local radical concentrations and oxidative stress conditions, as stated in the abstract.

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": null,
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "magnetic field effects (MFE) on lipid peroxidation radical dynamics",
    "magnetosensitivity via radical pair mechanism (RPM)",
    "magnetosensitivity via three-radical dipolar coupling mechanism (D3M)"
  ],
  "main_findings": "The paper presents a theoretical analysis of magnetosensitivity in lipid peroxidation, comparing the radical pair mechanism (RPM) with a three-radical dipolar coupling mechanism (D3M). It argues lipid peroxyl radicals have non-zero hyperfine couplings, implying recombination could be magnetosensitive via RPM, and concludes D3M interactions among three peroxyl radicals could produce larger magnetic field effects at low (geomagnetic-comparable) field intensities and be less limited by exchange coupling in the recombining radical pair.",
  "effect_direction": "unclear",
  "limitations": [
    "The work is a theoretical analysis; no experimental exposure conditions (frequency, intensity) are specified in the abstract.",
    "No human/animal population or sample size is described.",
    "Relevance is conditional on sufficient local radical concentrations and oxidative stress conditions, as stated in the abstract."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "lipid peroxidation",
    "magnetosensitivity",
    "magnetic field effects",
    "radical pair mechanism",
    "RPM",
    "three-radical dynamics",
    "dipolar coupling",
    "D3M",
    "hyperfine coupling",
    "geomagnetic field",
    "oxidative stress"
  ],
  "suggested_hubs": []
}

AI can be wrong. Always verify against the paper.

AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1039/c9cp01746a
PubMed: Not supplied

Read the original paper →

Related papers

← Back to the Research Library