Pulse Radiolysis Studies in Model Lipid Systems. The Influence of Aggregation on Kinetic Behavior of OH Induced Radicals in Aqueous Sodium Linoleate

作者: L. K. Patterson , K. Hasegawa

DOI: 10.1002/BBPC.19780820951

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摘要: The kinetic and spectral behavior of radicals formed by hydroxyl radical attack on linoleate anions has been studied pulse radiolysis. Reactivity ·OH toward this surfactant is an order magnitude greater in monomeric form [k·OH+linoleate = 8.0 ± 109 M−1 sec−1] than micellar [k·OH+lin(micelle) 1.0 109M−1 sec−1]. Abstraction a hydrogen atom from the doubly allylic position gives rise to intense absorption UV region (δmax 282–286 nm, e 3·104 cm−1) which may be used as probe activity at that site. This abstraction occur, small extent, directly via attack. However, 90% initial occurs other sites. Subsequent secondary H atoms appears occur predominantly by: (1) intramolecular processes monomers, (2) intermolecular micelles. Disappearance slower pseudo phase solution. Die kinetischen und spektralen Eigenschaften von Radikalen, die durch Reaktion OH-Radikalen mit Linoleat-Anionen entstehen. wurden der Pulsradiolyse untersucht. Die Reaktivitat OH ist gegenuber dem monomeren Linoleat-Anion etwa eine Grosenordnung groser (kOH + Linoleat 8,0 · s−1 als mizellaren Form (kOH+Lin(Mizelle) 1,0 s−1). Abspaltung eines Wasserstoffatoms zweifachen Allylposition fuhrt zu einer intensiven Absorption im UV-Bereich 282-286 104 M−1), Sonde fur Radikalaktivitat dieser Stelle dienen kann. Mehr OH-Radikale greifen jedoch anderen Stellen des Molekuls an. darauf folgende sekundare H-Atomen scheint hauptsachlich 1) intramolekulare Prozesse Monomeren 2. intermolekulare Mizellen erfolgen. Das Verschwinden Radikalen Sekundarprozesse geschieht Pseudophase langsamer Losung.

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