title: Investigation of singlet oxygen reactivity towards propofol.
abstract: The reaction between the anaesthetic agent 2,6-diisopropylphenol (propofol, PPF) and singlet oxygen (1O2) has been investigated in aqueous solution by means of HPLC, GC, absorption spectroscopy and laser flash photolysis with infrared luminescence detection. The rate constants for the physical and chemical quenching of 1O2 by PPF (kPPF) are found to be 2.66 x 10(5) M(-1) s(-1) and approximately 3.2 x 10(6) M(-1) s(-1) in CD3OD and D2O-CD3OD (75:25 v/v), respectively. The reaction of propofol with singlet oxygen produced by light irradiation of Rose Bengal leads essentially to two reaction products, 2,6-diisopropyl-p-benzoquinone and 3,5,3',5'-tetraisopropyl-(4,4')-diphenoquinone that are unambiguously identified from comparison with authentic samples.
authors.affiliation: Biomedical Spectroscopy, C.O.R.D., Department of Physics, Institute of Physics, B5, University of Liège, 4000 Liège, Belgium. Belinda.Heyne@ulg.ac.be
authors.forename: Belinda
authors.initials: B
authors.lastname: Heyne
authors.forename: Stephan
authors.initials: S
authors.lastname: Kohnen
authors.forename: Daniel
authors.initials: D
authors.lastname: Brault
authors.forename: Ange
authors.initials: A
authors.lastname: Mouithys-Mickalad
authors.forename: Francis
authors.initials: F
authors.lastname: Tfibel
authors.forename: Pol
authors.initials: P
authors.lastname: Hans
authors.forename: Marie-Pierre
authors.initials: MP
authors.lastname: Fontaine-Aupart
authors.forename: Maryse
authors.initials: M
authors.lastname: Hoebeke
mesh_terms: D018686:Anesthetics, Intravenous / Q000737:chemistry*; D002849:Chromatography, Gas; D002851:Chromatography, High Pressure Liquid; D007700:Kinetics; D015742:Propofol / Q000737:chemistry*; D026082:Singlet Oxygen / Q000737:chemistry*
chemical_list: D018686:Anesthetics, Intravenous; D026082:Singlet Oxygen; D015742:Propofol