Naslov
Elementary reaction steps in radiation induced hydroperoxidation of unsaturated fatty acids

Autori
Katušin-Ražem, Branka ; Ražem, Dušan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstracts of the 9th "Tihany" Symposium on Radiation Chemistry / - Budimpešta : Hungarian Chemical Society, 1998, P14-P14

Skup
9th "Tihany" Symposium on Radiation Chemistry

Mjesto i datum
Tata, Mađarska, 29.08.1998. - 03.09.1998

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Sažetak
Chain oxidation of unsaturated fatty acids (LH): oleic (OlH), linoleic (LiH), linolenic (LinH) and arachidonic (ArH) was initiated by 60-Co gamma rays at various dose rates. The measured radiation chemical yields of respective fatty acid hydroperoxides, G(LOOH), were iversely proportional to the square root of the dose rate, P, indicating a chain mechanism with bimolecular termination of propagating radicals (Eq. 1), where kp and kt are propagation and termination rate constants respectively, and G(L') is the radiation chemical yeild of initiating alkyl radicals (L'). G(L') was determined by the inhibitor method using alpha-tocopherol and measuring inhibiton dose, Dinh (Eq. 2). From these measurements respective oxidizabilities and kinetic chain lengths could be calculated. However, individual values of kp and kt could not be determined from a steady-state radiolysis data. Absolute values of the termination rate constants were measured independently, by the method of intermittent irradiation, for which a special apparatus was constructed. Thus absolute values of kp and kinh could be calculated (Table 1).

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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