hrvatski

Pojedinačni reakcijski stupnjevi u radiolitičkoj hidroperoksidaciji nezasićenih masnih kiselina

Chain oxidation of unsaturated fatty acids (LH): oleic (OH), linoleic (LiH) and linolenic (LinH) was initiated by 60-Co gamma razs at various dose rates. The measured radiation chemical yields of respective fatty acid pydroperoxides, G(LOOH), were inversely proportional to the square root of the dose rate, P, indicating a chain mechanism with bimoleculart termination of propagating radicals,...(Equation)... where kp and kt are propagation and termination rate constants respectively, and G(L') is the radiation chemical yield of initiating alkyl radicals (L'). G(L') was determined by the inhibitor method using alpha-tocopherol (alpha-toc) and measuring inhibition dose, Dinh: (Equation). From these measurements respective oxidizibilities and kinetic chain lengths v could be calculated. However, individual values of kp and kt could not be determined from a steady-state radiolysis data. Absolute value of the termination rate constant was measured independently, by the method of intermittent irradiation, for which a special apparatus was constructed. Thus absolute value of kp could be calculated.

nije evidentirano

nije evidentirano