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Abstract

The various species of free radicals formed on irradiation of wool keratin are compared as a function of power during EPR measurements, and as a function of the shape of the EPR signals during decay. It is shown that the change of size of the signal as a function of power is different for some different species of radicals, even though they may usually appear under common envelopes. Thus a method is available to study separately the behavior of the various species of radicals in wool having a common EPR envelope. Inspection of spectra of irradiated wool during decay in the dark reveals that one species of glycine-type radical diminishes, while another species of glycine-tye radical increases. This suggests that the kinetics of various radical species in wool are interdependent.

Keywords

Wool fiber light irradiation free radicals EPR spectrum power saturation glycine-type signal cystine-type signal different radical species lower settings light intensity signal increase sulfur radicals kinetics interchange signal decay illumination time decay time interdependence interdependent species second order kinetics mixed terms.

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References

Androes, G.M. and Calvin, M. , EPR in Biology, Biophys. J. (Symposium) 2, 217-258 (1962).

Friedberg, F. , The Effect of Ionizing Radiation on Solid Proteins , Rad. Res. Rev. 2, 131-147 (1969).

Gordy, W. and Shields, H. , ESR Studies of Radiation Damage to Proteins, Rad. Res. 9, 611-625 (1958).

Haber, A.H. and Randolph, M.L. , Gamma-Ray-Induced ESR Signals in Lettuce, Rad. Bot. 7, 17-28 (1967).

Loach, P.A. and Walsh, K. , Quantum Yield for the Photo-produced EPR Signal in Chromatophores from Rhodospirillum Rubrum, Biochem. 8, 1908-1913 (1969 ).

Rajewsky, B. and Redhardt, A. , Electronenresonanzuntersuchungen von Nachreaktionen in einem rontgenbestrahlten Faserprotein, Z. Naturforsch. 17b, 569-570 (1962).

Rajewsky, B. and Redhardt, A. , Zum Zeitverhalten von Elektronenresonanzsignalen in röntgenbestrahltem Federkeratin, Biophysik 1, 1-10 (1963).

Rajewsky, B. and Redhardt, A. , Zur Kinetik von Radikalreaktionen in röntgenbestrahltem hederkeratin, Biopliysik 1, 299-302 (1964).

Shatkay, A. and Michaeli, I. , EPR Study of Wool Irradiated by Ultraviolet and Visible Light, Rad. Res. 43, 485-498 (1970).

10.

Shatkay, A. and Michaeli, I. , Free Radicals in Irradiated Wool , Textile Res., J. 41, 269-270 (1971).

11.

Shatkay, A. and Michaeli, I. , EPR Study of Wool Irradiated with Blue Light , Photochem. Photobiol. in press.

12.

Snipes, W. and Henriksen, T. , Radiation-Induced Radicals in Thymidine Single Crystals at 77° K, Int. J. Rad. Biol. 17, 367-373 (1970).

13.

Stephen, M.J. and Fraenkel, G.K. , Theory of Saturation in ESR Spectra, J. Chem. Phys. 32, 1435-1444 (1960 ).

14.

Stratton, K. , ESR Studies on Proton-Irradiated Ribonuctease and Lysoxyme, Rad. Res. Suppl. 7, 102-115 (1967).

15.

Weaver, E.C. , New Light-induced EPR Signal in Anacystis nidulans , Nature 226, 183-184 (1970).

Differentiation between the Various Species of Free Radicals Appearing in Irradiated Keratin

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