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Effect of lipid hydroperoxides on pheophytin in the dark

✍ Scribed by Holasová, M. ;Pařízková, H. ;Davídek, J. ;Pokorný, J.

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
332 KB
Volume
33
Category
Article
ISSN
0027-769X

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✦ Synopsis

Pheophytin was heated with hydroperoxyoleate in the medium of methyl palmitate, methyl oleate or methyl linoleate to 60 "C in inert gas. The rate of pheophytin destruction due mostly to free peroxy radicals generated by hydroperoxide decomposition was proportional to the content of hydroperoxide. Double bonds of fatty acid esters were competitively attacked by free peroxy radicals. In systems containing low levels of oxygen, methyl esters were slowly autoxidized on heating, and pheophytin moderately inhibited their autoxidation. Because of a low concentration of pheophytins the antioxidant activity was more pronounced under conditions of a lower rate of oxidation chain initiation, i.e. in more saturated systems and at a lower content of hydroperoxides.

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