A study on the interactions between coenzyme Q 0 and superoxide anion. Could ubiquinones mimic superoxide dismutase (SOD)?

A study on the interactions between coenzyme Q 0 and superoxide anion. Could ubiquinones mimic... An electrochemical study was carried out on 1,4-benzoquinone, duroquinone, coenzymes Q 0 and Q 10 in the absence and in the presence of molecular oxygen in aprotic (DMF) and protic (DMF/H2O 95:5 (v/v)) media. Water was added because the investigated reactions are deeply influenced by the presence of protons. Q 0 and Q 10 exhibited a similar electrochemical behaviour. Since Q 0 is more soluble in protic medium than the biologically more important analogue Q 10 , it was chosen as a model for a more detailed investigation. Voltammetric studies of Q 0 carried out in aprotic and protic media in the presence of oxygen showed that, besides simple O2 ·− dismutation, the Q 0 promoted dismutation of O2 ·− should also be considered. Spectroelectrochemical experiments with the same experimental conditions support the electrochemical results, showing that in the presence of superoxide and in aprotic medium semiquinone Q 0 ·− gives rise to a disproportionation equilibrium, while in the presence of water it tends to be reoxidized to the starting Q 0 by OOH·. EPR measurements are also in agreement with these results. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

A study on the interactions between coenzyme Q 0 and superoxide anion. Could ubiquinones mimic superoxide dismutase (SOD)?

Loading next page...
 
/lp/springer_journal/a-study-on-the-interactions-between-coenzyme-q-0-and-superoxide-anion-f2421pgWUz
Publisher
Brill Academic Publishers
Copyright
Copyright © 2000 by VSP
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856700X00778
Publisher site
See Article on Publisher Site

Abstract

An electrochemical study was carried out on 1,4-benzoquinone, duroquinone, coenzymes Q 0 and Q 10 in the absence and in the presence of molecular oxygen in aprotic (DMF) and protic (DMF/H2O 95:5 (v/v)) media. Water was added because the investigated reactions are deeply influenced by the presence of protons. Q 0 and Q 10 exhibited a similar electrochemical behaviour. Since Q 0 is more soluble in protic medium than the biologically more important analogue Q 10 , it was chosen as a model for a more detailed investigation. Voltammetric studies of Q 0 carried out in aprotic and protic media in the presence of oxygen showed that, besides simple O2 ·− dismutation, the Q 0 promoted dismutation of O2 ·− should also be considered. Spectroelectrochemical experiments with the same experimental conditions support the electrochemical results, showing that in the presence of superoxide and in aprotic medium semiquinone Q 0 ·− gives rise to a disproportionation equilibrium, while in the presence of water it tends to be reoxidized to the starting Q 0 by OOH·. EPR measurements are also in agreement with these results.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jan 1, 2000

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off