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Absorption and fluorescence experiments on pheophytin and chlorophyll containing lipid bilayer vesicles are reported. Pheophytin aggregates on the vesicles are established from an additional red shifted band (at 695 nm) in the absorption spectrum. These aggregates contain pheophytin in an arrangement with the molecular planes of the porphyrin rings being parallel and cover about 10% of the vesicle surface. The lipid phase dissolves pheophytin up to a molar ratio of 15% above the lipid phase transition. This solubility limit decreases hardly on solidification of the lipid.

zeitschrift für naturforschung c

Spectroscopic and Thermodynamic Studies of Chlorophyll Containing Monolayers and Vesicles: Part II: Chlorophyll a and Pheophytin a Aggregation on DMPC Vesicles