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Titolo:
Antioxidant activity of green tea polyphenols against lipid peroxidation initiated by lipid-soluble radicals in micelles
Autore:
Chen, ZH; Zhou, B; Yang, L; Wu, LM; Liu, ZL;
Indirizzi:
Lanzhou Univ, Natl Lab Appl Organ Chem, Lanzhou 730000, Gansu, Peoples R China Lanzhou Univ Lanzhou Gansu Peoples R China 730000 Gansu, Peoples R China
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2
fascicolo: 9, , anno: 2001,
pagine: 1835 - 1839
SICI:
1472-779X(200109):9<1835:AAOGTP>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOW-DENSITY-LIPOPROTEIN; PHOTOSENSITIZED PEROXIDATION; COUMARIN DERIVATIVES; LINOLEIC-ACID; INHIBITION; LEAF;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Liu, ZL Lanzhou Univ, Natl Lab Appl Organ Chem, Lanzhou 730000, Gansu, Peoples R China Lanzhou Univ Lanzhou Gansu Peoples R China 730000 Peoples R China
Citazione:
Z.H. Chen et al., "Antioxidant activity of green tea polyphenols against lipid peroxidation initiated by lipid-soluble radicals in micelles", J CHEM S P2, (9), 2001, pp. 1835-1839

Abstract

Antioxidant effects of the principal polyphenolic components extracted from green tea leaves, i.e., (-)-epicatechin (EC), (-)-epicatechin gallate. (ECG), (-)-epigallocatechin (EGC) and (-)-epigallocatechin gallate (EGCG), against peroxidation of linoleic acid have been studied in sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB) micelles. The peroxidation was initiated thermally-by a lipid-soluble azo initiator di-tert-butylhyponitrite (DBHN) and the reaction kinetics were followed by formation oflinoleic-acid hydroperoxides and consumption of the antioxidant. Kinetic analysis of the antioxidation process demonstrates that these green tea polyphenols are effective antioxidants in micelles used either alone or in combination with alpha -tocopherol (vitamin E), but their antioxidative. behaviour and relative effectiveness are substantially different from those in the water-soluble initiator AMPAD-initiated peroxidations reported previously. The antioxidative action of the green tea polyphenols (GOHs) in DBHN-initiated peroxidation involves trapping the initiating tert-butoxyl radical and the propagating linoleic acid peroxyl radicals. However, the GOHs could not participate in the alpha -tocopherol recycling reaction as in the case of AMPAD-initiated reactions due to their very fast reaction with the initiating tert-butoxyl radical.

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Documento generato il 29/03/20 alle ore 13:12:05