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Abstract
Spinprobes (fatty acids, androstane, cholestane) that differ in the location of the paramagnetic centre relative to the polar membrane surface have been incorporated into lipid vesicles containing chlorophyll a. Quenching of the Chl a fluorescence is observed following the Stern-Vollmer-relationship. Quenching is more effective with spinprobes carrying the nitroxide group near the polar head groups of the lipid moiety. Quenching is also observed using a water soluble spinlabel. The porphyrin ring of the Chl a molecules is suggested to be localized in the polar head group region of the bilayer membrane.
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