Chlorophyll-Lipid-Interactions in Monomolecular Layers

• Published in: Zeitschrift für Naturforschung C
• Main Authors: Heithier, H., Möhwald, H.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Walter de Gruyter GmbH 1983
• Subjects: General Biochemistry, Genetics and Molecular Biology; DML
• Online Access: http://dx.doi.org/10.1515/znc-1983-11-1221; http://www.degruyter.com/view/j/znc.1983.38.issue-11-12/znc-1983-11-1221/znc-1983-11-1221.xml; https://www.degruyter.com/document/doi/10.1515/znc-1983-11-1221/xml; https://www.degruyter.com/document/doi/10.1515/znc-1983-11-1221/pdf

Mixed monolayers containing chlorophyll a and dim yristoyllecithin (DML) have been investigated by simultaneous thermodynamic, fluorescence and absorption spectroscopic measurements. It has been shown that the solubility limit of chlorophyll a in the fluid, as well as in the solid lipid matrix, is above 20 mol%. This contrasts to previous findings for pheophytin a containing monolayers and indicates the existance of an interaction between the phospholipid head group and the central Mg atom. A fluorescence decrease on solidifying the monolayer was observed and it is suggested that it is due to an enhanced self quenching as a consequence of the reorientation of the porphyrin rings, accompanying the phase transition