| | 1 | Author
| H. Heithier, H.-J Galla, H. Möhwald | Requires cookie* | | | Title
| Fluorescence Spectroscopic and Thermodynamic Studies of Chlorophyll Containing Monolayers and Vesicles. Part I: Mixed Monolayers of Pheophytin A and Lecithin  | | | | Abstract
| Mixed monolayers of pheophytin a and a-L-dimyristoyl lecithin (DML) are investigated on the water surface. The studies gain their special value from the simultaneous measurement of surface pressure and fluorescence intensity as a function of the covered area per molecule. A phase separation in the liquid state of the monolayer is established. Phase 1 exists almost exclusively of pheophytin molecules. Phase 2 exists essentially of D M L domains solubilizing pheo phytin in a concentration of 15 mol%. During the D M L main transition the pheophytin solubility decreases to about 2 mol%, the excess pheophytin being precipitated within the surface layer. During the pheophytin main transition an ordered structure below the surface layer is formed. A stabilizing interaction between the pheophytin domains and their environment is observed and discussed. A sharp fluorescence change at a pressure below 0.5 dyn/cm indicates another phase transition. It very probably involves an unwrapping of pheophytin from water molecules. | | | |
Reference
| Z. Naturforsch. 33c, 382 (1978); received March 15/April 3 1978 | | | |
Published
| 1978 | | | |
Keywords
| Monolayers, Chlorophyll, Energy Transfer, Fluorescence Spectroscopy, Phase Transitions | | | |
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| default:Reihe_C/33/ZNC-1978-33c-0382.pdf | | | | Identifier
| ZNC-1978-33c-0382 | | | | Volume
| 33 | |
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