Cited by 176Redox biology and oxidative stressFree Radicals and AntioxidantsAntioxidant Activity and Oxidative Stress

Activity of thiols as singlet molecular oxygen quenchers

Devasagayam, Thomas P.A., Sundquist, Alfred R., Di Mascio, Paolo, Kaiser, Stephan, Sies, Helmut·1991·Journal of Photochemistry and Photobiology B: Biology

Abstract

Singlet molecular oxygen O2(1 delta g) arising from the thermodissociation of the endoperoxide of 3,3'-(1,4-naphthylidene) dipropionate (NDPO2) was used to assess the quenching ability of various thiols and related compounds in sodium phosphate buffer in D2O at 37 degrees C. The overall quenching ability decreases in the sequence ergothioneine, methionine, cysteine, beta,beta-dimethyl cysteine (penicillamine), mercaptopropionylglycine, mesna, glutathione (GSH), dithiothreitol, N-acetyl cysteine and captopril. Cystine, glutathione disulphide, dimesna, methionine sulphone and methionine sulphoxide have no quenching effect. Comparison of the rate constants for physical (kq) with chemical (kr) quenching by thiols indicates that chemical reactivity accounts fully for their ability to quench O2(1 delta g), and pD dependence indicates that the thiolate anion reacts with O2(1 delta g). Loss of thiol groups, as exemplified by GSH, is not affected by the free radical scavengers superoxide dismutase and mannitol. However, sodium azide, a scavenger of O2(1 delta g), completely prevents NDPO2-induced thiol depletion. Depletion of GSH by NDPO2 is accompanied by the formation of its disulphide, sulphinate, sulphonate, sulphoxide and other products.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1016/1011-1344(91)80008-6

Cites

34 of 34 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • ERG can react with and detoxify, or prevent the formation of, hydroxyl radicals, singlet oxygen, ozone, superoxide, peroxide, hypochlorite and peroxynitrite.

    “Although the literature is somewhat scattered and heterogeneous, it seems clear that as well as hydroxyl radicals(228–232), ERG can also react with and detoxify, or prevent the formation of, singlet oxygen(233–242), ozone(243), superoxide(231,241,244–246), peroxide(32,124,247,248), hypochlorite(32,232,249) and peroxynitrite(224,231,250,251).”

    From The biology of ergothioneine, an antioxidant nutraceutical (2020) · cites this paper as [234]

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Devasagayam, T. P. A., Sundquist, A. R., Di Mascio, P., Kaiser, S., & Sies, H.
Affiliations
Heinrich Heine University Düsseldorf (DE)
Corresponding author
Sies, Helmut
Venue
Journal of Photochemistry and Photobiology B: Biology
Publisher
Elsevier BV
Published
1991-04
Volume
9
Issue
1
Pages
105-116
ISSN
1011-1344 (ISSN-L)
OpenAlex
W1997822338
Cited by
175
References
34
Citations by year
2026: 4 · 2025: 6 · 2024: 5 · 2023: 4 · 2022: 3 · 2021: 8 · 2020: 9 · 2019: 6 · 2018: 7 · 2017: 3 · 2016: 7 · 2015: 7 · 2014: 10 · 2013: 6 · 2012: 6
FWCI
2.03
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Photochemistry and Photobiology B Biology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Physical Sciences › Chemistry › Organic Chemistry › Free Radicals and Antioxidants
  • Health Sciences › Medicine › Biochemistry › Antioxidant Activity and Oxidative Stress
Keywords
singlet oxygen, glutathione depletion, glutathione disulfide, chemical quenching, physical quenching, thiolate anion, sodium azide, superoxide dismutase, mannitol, mesna, N-acetylcysteine, cysteine, methionine, ergothioneine, D-penicillamine, dithiothreitol, captopril
MeSH terms
Glutathione, Oxidation-Reduction, Oxygen, Photochemistry, Sulfhydryl Compounds, Singlet Oxygen

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review