Radiation effects in organic solutions of cholesteryl nonanoate and cholesteryl decanoate

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Abstract
The products of γ radiolysis of solutions of cholesteryl nonanoate and cholesteryl decanoate cause a decrease in the color transition temperatures which is proportional to the absorbed dose. The rate of the lowering of the colour transition temperature depends strongly on the solvent and is inversely proportional to the concentration of the cholesteric esters. Carbon tetrachloride solutions of cholesteryl alkanoates from formate to decanoate were found to have the same G(HCl) both in the absence of air (G = 4.5 ± 0.4) or in the presence of air (G = 11 ± 1). G(CHC13) were found to be 2.7 ± 0.2 in the presence of air and 3.8 ± 0.2 in deaerated samples for all the above mentioned esters in a concentration of 0.1 M. The hydrogen abstracted to form CHCl3 is mostly the allylic hydrogen from the cholesterol skeleton.

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