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Kinetic studies on anthralin photooxidation.

K Müller1, R C Kanner, C S Foote

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles 90024.

Photochemistry and Photobiology
|September 1, 1990
PubMed
Summary
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The photooxidation of anthralin is driven by its anionic form, not the neutral drug. This research quantifies the reaction rate, crucial for understanding anthralin's stability and drug interactions.

Area of Science:

  • Photochemistry
  • Chemical kinetics
  • Pharmacology

Background:

  • Anthralin is an antipsoriatic drug.
  • Understanding drug photooxidation is vital for stability and efficacy.
  • Singlet oxygen (1O2) is a reactive oxygen species implicated in photodegradation.

Purpose of the Study:

  • To investigate the photooxidation mechanism of anthralin.
  • To determine the reactive species involved in anthralin photodegradation.
  • To quantify the rate constants for singlet oxygen deactivation by anthralin.

Main Methods:

  • Direct observation of singlet oxygen luminescence at 1.27 microns.
  • Luminescence quenching studies in deuterated buffer systems.
  • Competition experiments using tetramethylethylene in acetonitrile.

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Main Results:

  • The rate of singlet oxygen deactivation increases at higher pH, indicating the trihydroxyanthracene anion is the reactive species.
  • The rate constant for singlet oxygen deactivation by the anthralin anion was determined to be 3.0 x 10^8 M^-1 s^-1.
  • The neutral anthrone form of anthralin is unreactive towards singlet oxygen, with a rate constant of 2.8 x 10^4 M^-1 s^-1 in benzene-d6.

Conclusions:

  • Anthralin photooxidation is primarily mediated by its anionic form.
  • The kinetic data provide a quantitative basis for understanding anthralin's photosensitivity.
  • This study clarifies the role of singlet oxygen in anthralin degradation.