Transients and stable radical from the deamination of α-alanine

  • Z. P. Zagórski
  • K. Sehested
Proceedings of the PULS'97

Abstract

The objects of investigation were single crystals of L-α-alanine, in which radical anion CH3 C˙H CO2 has been formed by radiation induced deamination of alanine. Previously, this stable radical has been spectrally identified (λmax, ε=1100 M−1·cm−1), and its characteristics have found to be identical with characteristics of the same radical obtained by pulse radiolysis in aqueous solution. The mechanism of radical formation in the solid state is not known. Time resolved pulse radiolysis of single crystal alanine has shown more complicated way of the formation of the same radical in solid state than in aqueous solution. The electrons abstracted from the solid alanine molecule neutralise positive of zwitter-ion alanine. Ammonia is leaving the reaction-complex in time of milliseconds, leaving the stable radical anion.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    ASTM Standard E 1607-94, Standard Practice for Use of the Alanine-EPR Dosimetry System, 1994. This standard is under revision, which has started on Sept.8, 1996, and is under discussion.Google Scholar
  2. 2.
    J. W. Hansen, K. J. Olsen, M. Wille, Radiat. Prot. Dosim., 19 (1987) 43.Google Scholar
  3. 3.
    G. Przybytniak, Z. P. Zagórski, J. Radioanal. Nucl. Chem., 212 (1996) 373.Google Scholar
  4. 4.
    Z. P. Zagórski, A. Rafalski, J. Radioanal. Nucl. Chem., 196 (1995) 97.Google Scholar
  5. 5.
    Z. P. Zagórski, G. K. Przybytniak, Nukleonika, 42 (1997) 373.Google Scholar
  6. 6.
    Z. P. Zagórski, Chapter “Pulse radiolysis of solid and rigid systems” in the monography: Properties and Reactions of Radiation Induced Transients: Selected Topics,J. Mayer, (Ed.), PWN Warsaw, 1998, in print.Google Scholar
  7. 7.
    G. V. Buxton, G. A. Salmon, Chem. Phys. Letters, 73 (1980) 304.Google Scholar

Copyright information

© Akadémiai Kiadó 1998

Authors and Affiliations

  • Z. P. Zagórski
    • 1
  • K. Sehested
    • 2
  1. 1.Department of Radiation Chemistry and TechnologyInstitute of Nuclear Chemistry and TechnologyWarsawPoland
  2. 2.Risř National LaboratoryRoskildeDenmark

Personalised recommendations