Biochemistry (Moscow)

, Volume 68, Issue 9, pp 963–966

Activation of Molecular Oxygen by Infrared Laser Radiation in Pigment-Free Aerobic Systems

  • A. A. KrasnovskyJr.
  • N. N. Drozdova
  • A. V. Ivanov
  • R. V. Ambartsumian
Article

DOI: 10.1023/A:1026052310563

Cite this article as:
Krasnovsky, A.A., Drozdova, N.N., Ivanov, A.V. et al. Biochemistry (Moscow) (2003) 68: 963. doi:10.1023/A:1026052310563
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Abstract

With the goal of mimicking the mechanisms of the biological effects of low energy laser irradiation, we have shown that infrared low intensity laser radiation causes oxygenation of the chemical traps of singlet oxygen dissolved in organic media and water saturated by air at normal atmospheric pressure. The photooxygenation rate was directly proportional to the oxygen concentration and strongly inhibited by the singlet oxygen quenchers. The maximum of the photooxygenation action spectrum coincided with the maximum of the oxygen absorption band at 1270 nm. The data provide unambiguous evidence that photooxygenation is determined by the reactive singlet 1Δg state formed as a result of direct laser excitation of molecular oxygen. Hence, activation of oxygen caused by its direct photoexcitation may occur in natural systems.

singlet oxygen oxygen photoactivation infrared laser radiation 

Copyright information

© MAIK “Nauka/Interperiodica” 2003

Authors and Affiliations

  • A. A. KrasnovskyJr.
    • 1
  • N. N. Drozdova
    • 1
  • A. V. Ivanov
    • 2
  • R. V. Ambartsumian
    • 3
  1. 1.Russian Academy of Sciences, Leninskii pr. 33Bach Institute of BiochemistryMoscowRussia
  2. 2.Russian Academy of Medical Sciences, Kashirskoe Shosse 24Blokhin Russian Cancer CenterMoscowRussia
  3. 3.Russian Academy of Sciences, Leninskii pr. 53Lebedev Physics InstituteMoscowRussia

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