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Antioxidant effects of chlorophyll and pheophytin on the autoxidation of oils in the dark. II. The mechanism of antioxidative action of chlorophyll
Author(s) -
Endo Yasushi,
Usuki Riichiro,
Kaneda Takashi
Publication year - 1985
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02545965
Subject(s) - autoxidation , chlorophyll , chemistry , antioxidant , pheophytin , chlorophyll a , radical , photochemistry , chlorophyll b , porphyrin , light harvesting complexes of green plants , organic chemistry , photosynthesis , biochemistry , photosystem ii , photosystem
To understand the mechanism of the antioxidant effect of chlorophyll on the autoxidation of oils in the dark, antioxidant activities of several derivatives of chlorophyll were compared. Antioxidant activities were observed in chlorophyll derivatives such as protopor‐phyrin methyl ester and its magnesium chelated compound. Porphyrin seems to be an essential chemical structure for the antioxidant activity of chlorophyll. Chlorophyll did not decompose the hydroperoxides, but reduced free radicals such as 1,1‐diphenyl‐2‐picrylhydrazyl. Electron spin resonance spectrum of the π‐cation radical was recorded during the oxidation of chlorophyll in methyl linoleate solution. These observations suggest that chlorophyll may act as a hydrogen donor to break the chain reaction.