ACTA

Radiation Damage Centers in Cholesteryl Heptanoate

U. Sayin^{a, b}, C. Can^a, E. Türkkan^c, Ö. Dereli^c, A. Ozmen^a and H. Yüksel^a
^aPhysics Department, Selcuk University, Konya, Turkey
^bAdvanced Technology Research and Application Center, Selcuk University, Konya, Turkey
^cPhysics Education Department, Necmettin Erbakan University, Konya, Turkey

Received: July 30, 2012; in final form: April 6, 2013

Full Text PDF

Cholesterol takes part significantly in many biological mechanisms and as important component for manufacture of bile acids, steroid hormones, and several fat-soluble vitamins. To determine magnetic properties of cholesteryl heptanoate (C₃₄H₅₈O₂) which is an important cholesteryl ester in human life and new technology, the single crystals of cholesteryl heptanoate were grown by slow evaporation of concentrated ethyl acetate solution and the grown single crystals were irradiated at room temperature with ⁶⁰Co γ ray. The radical produced by gamma irradiation has been investigated in the range of temperatures 123-330 K for different orientations of the crystal in a magnetic field by EPR. Radiation damage center was attributed to radical ĊH_αCH_2β. The g factor and hyperfine coupling constants have slight dependence on temperature and evident dependence on the orientation of the magnetic field. Determined g factor and hyperfine coupling constants for the radical ĊH_αCH_2β were found to be anisotropic with the average values g_av=2.0036, (a_{CH_α})_av=14.52 G, (a_{CH_2β})_av=25.78 G.

DOI: 10.12693/APhysPolA.124.70
PACS numbers: 61.80.-x