Light-Stimulated Generation of Free Radicals by Quinones-Chelators
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        Irina D. Markova
        , Olga Yu. Selyutina 
Abstract
The role of metal ions in the mechanism of light-stimulated redox activity of potential anticancer agent 2-phenyl-4-(butylamino)naphtha[2,3-h]quinoline-7,12-dione (Qc) has been studied by CIDNP (chemically induced dynamic nuclear polarization) and EPR methods. The photo-induced oxidation of NADH and its synthetic analog – substituted dihydropyridine (DHP) – by quinone Qc was used as a model. The Qc capability of producing chelating complexes with divalent metal ions of Fe, Zn and Ca was studied quantitatively by optical absorption spectroscopy. A significant decrease of electrochemical reduction potential of Qc (ΔE=0.4−0.6 eV for ACN and ACN/PBS solutions) in chelating complexes and in protonated form of Qc was observed. A pronounced increase in efficiency of DHP oxidation in chelating complexes with Zn2+ and Ca2+ ions compared with free Qc was demonstrated. The yields of free radicals, including reactive oxygen species (ROS) and reaction products, were a few times higher than those in the absence of metal ions. Application of such chelating compounds to enhance ROS generation looks very promising for anti-cancer therapy, including the photodynamic therapy.
Dedicated to: Kev Salikhov on the occasion of his 80th birthday.
Acknowledgements
This study is supported by grant 14-03-00192 from the Russian Foundation for Basic Research. L. M. Weiner thanks for financial support by Russian Ministry of Education and Science project 5-100.
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©2017 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Preface
- Editorial Review
- From Free Radicals and Spin-Chemistry Over Spin-Dynamics and Hyperpolarization to Biology and Materials Science
- On Relations Between Singlet and Triplet Recombination Yields for Singlet and Triplet Precursors
- The Quantum Dynamical Basis of a Classical Kinetic Scheme Describing Coherent and Incoherent Regimes of Radical Pair Recombination
- Reaction Operators for Radical Pairs. The Exactly Solvable Model
- Estimation of the Fraction of Spin-Correlated Radical Ion Pairs in Irradiated Alkanes using Magnetosensitive Recombination Luminescence from Exciplexes Generated upon Recombination of a Probe Pair
- Theoretical Description of Pulsed RYDMR: Refocusing Zero-Quantum and Single Quantum Coherences
- A Transient EPR Study of Electron Transfer in Tetrathiafulvalene-Aluminum(III) Porphyrin-Anthraquinone Supramolecular Triads
- Solvent Radical Anions in Irradiated Aliphatic Ketones and Esters as Observed Using Time-Resolved Magnetic Field Effects in the Recombination Fluorescence
- Effect of Dehydrated Trehalose Matrix on the Kinetics of Forward Electron Transfer Reactions in Photosystem I
- Photo-CIDNP in the Reaction Center of the Diatom Cyclotella meneghiniana Observed by 13C MAS NMR
- Light-Stimulated Generation of Free Radicals by Quinones-Chelators
- Influence of C2-Methylation of Imidazolium Based Ionic Liquids on Photoinduced Spin Dynamics of the Dissolved ZnTPP Studied by Time-Resolved EPR
- ESR Study of Electron States in Ge/Si Heterostructures with Nanodisc Shaped Quantum Dots
- Novel Anthrathiophene-Based Small Molecules as Donor Material for Organic Photovoltaics: Synthesis and Light-Induced EPR Study
- Structural Determination of a DNA Oligomer for a Molecular Spin Qubit Lloyd Model of Quantum Computers
Artikel in diesem Heft
- Frontmatter
- Preface
- Editorial Review
- From Free Radicals and Spin-Chemistry Over Spin-Dynamics and Hyperpolarization to Biology and Materials Science
- On Relations Between Singlet and Triplet Recombination Yields for Singlet and Triplet Precursors
- The Quantum Dynamical Basis of a Classical Kinetic Scheme Describing Coherent and Incoherent Regimes of Radical Pair Recombination
- Reaction Operators for Radical Pairs. The Exactly Solvable Model
- Estimation of the Fraction of Spin-Correlated Radical Ion Pairs in Irradiated Alkanes using Magnetosensitive Recombination Luminescence from Exciplexes Generated upon Recombination of a Probe Pair
- Theoretical Description of Pulsed RYDMR: Refocusing Zero-Quantum and Single Quantum Coherences
- A Transient EPR Study of Electron Transfer in Tetrathiafulvalene-Aluminum(III) Porphyrin-Anthraquinone Supramolecular Triads
- Solvent Radical Anions in Irradiated Aliphatic Ketones and Esters as Observed Using Time-Resolved Magnetic Field Effects in the Recombination Fluorescence
- Effect of Dehydrated Trehalose Matrix on the Kinetics of Forward Electron Transfer Reactions in Photosystem I
- Photo-CIDNP in the Reaction Center of the Diatom Cyclotella meneghiniana Observed by 13C MAS NMR
- Light-Stimulated Generation of Free Radicals by Quinones-Chelators
- Influence of C2-Methylation of Imidazolium Based Ionic Liquids on Photoinduced Spin Dynamics of the Dissolved ZnTPP Studied by Time-Resolved EPR
- ESR Study of Electron States in Ge/Si Heterostructures with Nanodisc Shaped Quantum Dots
- Novel Anthrathiophene-Based Small Molecules as Donor Material for Organic Photovoltaics: Synthesis and Light-Induced EPR Study
- Structural Determination of a DNA Oligomer for a Molecular Spin Qubit Lloyd Model of Quantum Computers