Abstract
Abstract Oxidation of E phytol and chlorophyll a phytyl chain by hydroxyl and peroxy radicals yielded several interesting isoprenoid compounds. Gas chromatography (GC) and GC—mass spectrometry analyses allowed us to identify notably 6,10,14-trimethylpentadecan-2-one, Z and E phytenals, Z and E 3,7,11,15-tetramethyl-2,3-epoxyhexadecanols and 3,7,11,15-tetramethylhexadecan-1,2,3-triol. Different mechanisms were proposed to explain the formation of these degradation products. The detection of Z and E 3,7,11,15-tetramethyl-2,3-epoxyhexadecanols and 3,7,11,15-tetramethylhexadecan-1, 2,3-triol after photodegradation of chlorophyll a in sea water shows that oxy-free radicals act parallel to 1 O 2 on the phytyl chain during the photodestructive oxidation of this pigment.
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