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Russian Journal of Electrochemistry

, Volume 36, Issue 7, pp 767–772 | Cite as

Redox properties of naturally occurring naphthoquinones: Vitamin K2(20) and lapachol

  • S. A. Petrova
  • O. S. Ksenzhek
  • M. V. Koiodyazhnyi
Article

Abstract

Redox properties of two naturally occurring naphthoquinones, vitamin K2(20) and lapochol, are examined by thin-layer voltammetry on a pyrolytic graphite electrode. The pH-potential diagrams of these compounds are plotted. In aqueous solutions, the quinones are shown to exist each in five forms. Thermodynamic parameters for all redox and acid-base equilibria between conjugated forms are determined. In contrast to lapachol, vitamin K2(20) forms, during its reduction, a large amount of stable semiquinone in a wide pH interval

Keywords

Quinone Redox Property Naphthoquinones Pyrolytic Graphite Electrode Lapachol 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© MAIK “Nauka/Interperiodica” 2000

Authors and Affiliations

  • S. A. Petrova
    • 1
  • O. S. Ksenzhek
    • 1
  • M. V. Koiodyazhnyi
    • 1
  1. 1.Ukrainian State University of Chemical TechnologyDnepropetrovskUkraine

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