A possible model of hemoprotein-fatty acid peroxide complex demonstrated by electron spin resonance.
Coordination reaction between linolenic-acid-hydroperoxide (LHPO) and chloro(5, 10, 15, 20-tetraphenyl)-porphyrinato iron (III), Fe(III)TPPCl, was investigated by means of ESR. ESR spectra of the ferric low-spin complex (g1 = 2.336, g2 = 2.174 and g3 = 1.929) was recorded for the mixture prepared by mixing Fe(III)TPPCl and LHPO at -78 degrees C in the presence of alkaline reagent. ESR line width of complex was broadened when 17O2 labeled LHPO was used for ESR measurement. In terms of the g-parameters of the ferric low-spin species, this complex was concluded to be Fe(III)TPP(-OCH3)(-OO-linolenic acid) type complex.
Tajima
K
K
Department of Chemistry, Faculty of Science, Ehime University, Matsuyama, Japan.
Shigematsu
M
M
Jinno
J
J
Kawano
Y
Y
Mikami
K
K
Ishizu
K
K
Ohya-Nishiguchi
H
H
Shigamatsu
M
M
D004578:Electron Spin Resonance Spectroscopy; D005290:Ferric Compounds; D006420:Hemeproteins; D008041:Linoleic Acids; D008054:Lipid Peroxides; D008665:Metalloporphyrins; D008956:Models, Chemical; D015394:Molecular Structure
D005290:Ferric Compounds; D006420:Hemeproteins; D008041:Linoleic Acids; D008054:Lipid Peroxides; D008665:Metalloporphyrins; C062664:chloro(5,10,15,20-tetraphenyl)porphyrinatoiron(III)