Cited by 2,417Antioxidant Activity and Oxidative StressFree Radicals and AntioxidantsPhytochemicals and Antioxidant Activities

The Pecking Order of Free Radicals and Antioxidants: Lipid Peroxidation, α-Tocopherol, and Ascorbate

Buettner, G.R.·1993·Archives of Biochemistry and Biophysics

Abstract

Free radicals vary widely in their thermodynamic properties, ranging from very oxidizing to very reducing. These thermodynamic properties can be used to predict a pecking order, or hierarchy, for free radical reactions. Using one-electron reduction potentials, the predicted pecking order is in agreement with experimentally observed free radical electron (hydrogen atom) transfer reactions. These potentials are also in agreement with experimental data that suggest that vitamin E, the primary lipid soluble small molecule antioxidant, and vitamin C, the terminal water soluble small molecule antioxidant, cooperate to protect lipids and lipid structures against peroxidation. Although vitamin E is located in membranes and vitamin C is located in aqueous phases, vitamin C is able to recycle vitamin E; i.e., vitamin C repairs the tocopheroxyl (chromanoxyl) radical of vitamin E, thereby permitting vitamin E to function again as a free radical chain-breaking antioxidant. This review discusses: (i) the thermodynamics of free radical reactions that are of interest to the health sciences; (ii) the fundamental thermodynamic and kinetic properties that are associated with chain-breaking antioxidants; (iii) the unique interfacial nature of the apparent reaction of the tocopherol free radical (vitamin E radical) and vitamin C; and (iv) presents a hierarchy, or pecking order, for free radical electron (hydrogen atom) transfer reactions.

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Crossref · 10.1006/abbi.1993.1074

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  • At micromolar concentrations, physiological ascorbate acts as an antioxidant that reduces harmful ROS.

    “physiological ascorbate at micromolar concentrations can reduce harmful ROS9”

    From Targeting cancer vulnerabilities with high-dose vitamin C (2019) · cites this paper as [9]

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Authors
Buettner, G. R.
Affiliations
University of Iowa (US)
Corresponding author
Buettner, G.R.
Venue
Archives of Biochemistry and Biophysics
Publisher
Elsevier BV
Published
1993-02
Volume
300
Issue
2
Pages
535-543
ISSN
0003-9861 (ISSN-L)
OpenAlex
W2061242359
Cited by
2,417
References
0
Citations by year
2026: 46 · 2025: 41 · 2024: 58 · 2023: 72 · 2022: 81 · 2021: 87 · 2020: 76 · 2019: 74 · 2018: 73 · 2017: 68 · 2016: 66 · 2015: 82 · 2014: 100 · 2013: 90 · 2012: 101
FWCI
39.15
Type
journal article
Language
en
Open access
closed
Locations
  • Archives of Biochemistry and Biophysics (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Biochemistry › Antioxidant Activity and Oxidative Stress
  • Physical Sciences › Chemistry › Organic Chemistry › Free Radicals and Antioxidants
  • Health Sciences › Medicine › Biochemistry › Phytochemicals and Antioxidant Activities
Keywords
free radicals, pecking order, redox potential, hydrogen atom transfer, lipid peroxidation, alpha-tocopherol, vitamin E, vitamin C, tocopheroxyl radical, chain-breaking antioxidants
MeSH terms
Antioxidants, Ascorbic Acid, Fatty Acids, Unsaturated, Free Radicals, Kinetics, Membrane Lipids, Oxidation-Reduction, Thermodynamics, Vitamin E, Lipid Peroxidation

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