title: Characterization of isomeric allylic diols resulting from chlorophyll phytyl side-chain photo- and autoxidation by electron ionization gas chromatography/mass spectrometry.
abstract: The electron ionization (EI) mass spectral fragmentation of the trimethylsilyl derivatives of 3-methylidene-7,11,15-trimethylhexadecane-1,2-diol, Z- and E-3,7,11,15-tetramethylhexadec-3-ene-1,2-diols and Z- and E-3,7,11,15-tetramethylhexadec-2-ene-1,4-diols resulting from chlorophyll phytyl side-chain photo- and autoxidation was investigated. Different pathways (substantiated by deuterium labelling) were proposed in order to explain the main fragmentation observed. Then, some sufficiently specific fragment ions were selected and used to characterize these compounds in natural environmental samples.
authors.affiliation: Laboratoire de Microbiologie de Géochimie et d'Ecologie Marines UMR 6117, Centre d'Océanologie de Marseille, Campus de Luminy-case 901, 13288 Marseille, France. rontani@com.univ-mrs.fr
authors.forename: J-F
authors.initials: JF
authors.lastname: Rontani
authors.forename: C
authors.initials: C
authors.lastname: Aubert
mesh_terms: D002734:Chlorophyll / Q000032:analysis* / Q000737:chemistry* / Q000528:radiation effects; D004784:Environmental Monitoring / Q000379:methods; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D007536:Isomerism; D008027:Light; D010084:Oxidation-Reduction; D010777:Photochemistry / Q000379:methods*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D014297:Trimethylsilyl Compounds / Q000032:analysis* / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D014297:Trimethylsilyl Compounds; D002734:Chlorophyll