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Titolo:
Time-resolved EPR investigation of the photo-initiated intramolecular antioxidant reaction of vitamin K-vitamin E linked molecule
Autore:
Nishioku, Y; Ohara, K; Mukai, K; Nagaoka, S;
Indirizzi:
Ehime Univ, Fac Sci, Dept Chem, Matsuyama, Ehime 7908577, Japan Ehime Univ Matsuyama Ehime Japan 7908577 Matsuyama, Ehime 7908577, Japan Inst Mol Sci, Okazaki, Aichi 4448585, Japan Inst Mol Sci Okazaki Aichi Japan 4448585 i, Okazaki, Aichi 4448585, Japan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 21, volume: 105, anno: 2001,
pagine: 5032 - 5038
SICI:
1520-6106(20010531)105:21<5032:TEIOTP>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORRELATED RADICAL PAIRS; HYDROGEN ABSTRACTION; HYDROCHLORIC-ACID; PHOTOCHEMICAL-REACTIONS; LIPID-PEROXIDATION; ALPHA-TOCOPHEROL; CIDEP; XANTHONE; RESONANCE; PHOTOREDUCTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Ohara, K Ehime Univ, Fac Sci, Dept Chem, Matsuyama, Ehime 7908577, Japan Ehime Univ Matsuyama Ehime Japan 7908577 a, Ehime 7908577, Japan
Citazione:
Y. Nishioku et al., "Time-resolved EPR investigation of the photo-initiated intramolecular antioxidant reaction of vitamin K-vitamin E linked molecule", J PHYS CH B, 105(21), 2001, pp. 5032-5038

Abstract

The models of vitamin K and vitamin E linked molecule, (1-(1,4-naphthoquinone-2-oxy)-6-(hydroxy-2,5,7,8- tetramethylchroman-2-carbonyloxy)-hexane) was synthesized as a model of vitamin K and vitamin E which coexist in biological membranes. The time-resolved EPR (TR-EPR) spectra of this molecule could be assigned to vitamin K and E radicals and showed that the excited triplet state of the vitamin K moiety was rapidly quenched by abstraction of hydrogen from the vitamin E moiety. The broad and emissive CIDEP spectra observed in ethanol suggested that the intramolecular interaction between vitamin K and vitamin E radicals was strong there. The relatively resolved spectra observed in a TX-100 micelle system, on the other hand, indicated that the interaction between these radicals was very weak. These results suggest that the vitamin K and E radicals existed around the water-oil interface ofthe micelle independently. The absence of a deuterium effect in our experiments showed that tunneling does not contribute significantly to the quenching reaction.

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Documento generato il 28/03/20 alle ore 10:29:25