A new fluorescence method to detect singlet oxygen inside phospholipid model membranes.
A fluorescence method for detecting singlet oxygen (1O2) in model membranes is proposed. 1O2 was generated by hydrogen peroxide/sodium hypochlorite system. 1,3-Diphenylisobenzofuran (DPBF), a specific 1O2 trap, dissolved in organic solvents gives a strong fluorescence spectrum when excited at 410 nm. A similar spectrum, with a maximum at 455 nm, is obtained when DPBF is incorporated in unilamellar dipalmitoylphosphatidylcholine liposomes. The intensity of fluorescence spectrum decreases when DPBF-labeled liposomes are exposed to singlet oxygen. This decrease is sensitive to 1O2 traps and quenchers like tryptophan and sodium azide, to lipid membrane fluidity and to the concentration of sodium hypochlorite and hydrogen peroxide.
Wozniak
M
M
Department of Biochemistry, Medical Academic School, Gdansk, Poland.
Tanfani
F
F
Bertoli
E
E
Zolese
G
G
Antosiewicz
J
J
D015060:1,2-Dipalmitoylphosphatidylcholine; D001386:Azides / Q000494:pharmacology; D001572:Benzofurans / Q000378:metabolism; D005456:Fluorescent Dyes; D006861:Hydrogen Peroxide; D006997:Hypochlorous Acid; D008081:Liposomes / Q000032:analysis* / Q000378:metabolism; D008560:Membrane Fluidity; D010100:Oxygen / Q000032:analysis*; D026082:Singlet Oxygen; D019810:Sodium Azide; D013050:Spectrometry, Fluorescence; D014364:Tryptophan / Q000494:pharmacology
D001386:Azides; D001572:Benzofurans; D005456:Fluorescent Dyes; D008081:Liposomes; D026082:Singlet Oxygen; D015060:1,2-Dipalmitoylphosphatidylcholine; C011238:1,3-diphenylisobenzofuran; D006997:Hypochlorous Acid; D014364:Tryptophan; D019810:Sodium Azide; D006861:Hydrogen Peroxide; D010100:Oxygen