Fluorescence Spectroscopic and Thermodynamic Studies of Chlorophyll Containing Monolayers and Vesicles. Part I: Mixed Monolayers of Pheophytin A and Lecithin
Mixed monolayers of pheophytin a and α-ʟ-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 l...
Published in: | Zeitschrift für Naturforschung C |
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Walter de Gruyter GmbH
1978
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Online Access: | http://dx.doi.org/10.1515/znc-1978-5-613 http://www.degruyter.com/view/j/znc.1978.33.issue-5-6/znc-1978-5-613/znc-1978-5-613.xml https://www.degruyter.com/document/doi/10.1515/znc-1978-5-613/pdf |
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crdegruyter:10.1515/znc-1978-5-613 2023-05-15T16:01:24+02:00 Fluorescence Spectroscopic and Thermodynamic Studies of Chlorophyll Containing Monolayers and Vesicles. Part I: Mixed Monolayers of Pheophytin A and Lecithin Heithier, H. Galla, H.-J. Möhwald, H. 1978 http://dx.doi.org/10.1515/znc-1978-5-613 http://www.degruyter.com/view/j/znc.1978.33.issue-5-6/znc-1978-5-613/znc-1978-5-613.xml https://www.degruyter.com/document/doi/10.1515/znc-1978-5-613/pdf unknown Walter de Gruyter GmbH http://creativecommons.org/licenses/by-nc-nd/3.0/ CC-BY-NC-ND Zeitschrift für Naturforschung C volume 33, issue 5-6, page 382-391 ISSN 1865-7125 0939-5075 General Biochemistry, Genetics and Molecular Biology journal-article 1978 crdegruyter https://doi.org/10.1515/znc-1978-5-613 2022-04-14T05:04:56Z Mixed monolayers of pheophytin a and α-ʟ-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 DML domains solubilizing pheophytin in a concentration of 15 mol%. During the DML 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. Article in Journal/Newspaper DML De Gruyter (via Crossref) Zeitschrift für Naturforschung C 33 5-6 382 391 |
institution |
Open Polar |
collection |
De Gruyter (via Crossref) |
op_collection_id |
crdegruyter |
language |
unknown |
topic |
General Biochemistry, Genetics and Molecular Biology |
spellingShingle |
General Biochemistry, Genetics and Molecular Biology Heithier, H. Galla, H.-J. Möhwald, H. Fluorescence Spectroscopic and Thermodynamic Studies of Chlorophyll Containing Monolayers and Vesicles. Part I: Mixed Monolayers of Pheophytin A and Lecithin |
topic_facet |
General Biochemistry, Genetics and Molecular Biology |
description |
Mixed monolayers of pheophytin a and α-ʟ-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 DML domains solubilizing pheophytin in a concentration of 15 mol%. During the DML 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. |
format |
Article in Journal/Newspaper |
author |
Heithier, H. Galla, H.-J. Möhwald, H. |
author_facet |
Heithier, H. Galla, H.-J. Möhwald, H. |
author_sort |
Heithier, H. |
title |
Fluorescence Spectroscopic and Thermodynamic Studies of Chlorophyll Containing Monolayers and Vesicles. Part I: Mixed Monolayers of Pheophytin A and Lecithin |
title_short |
Fluorescence Spectroscopic and Thermodynamic Studies of Chlorophyll Containing Monolayers and Vesicles. Part I: Mixed Monolayers of Pheophytin A and Lecithin |
title_full |
Fluorescence Spectroscopic and Thermodynamic Studies of Chlorophyll Containing Monolayers and Vesicles. Part I: Mixed Monolayers of Pheophytin A and Lecithin |
title_fullStr |
Fluorescence Spectroscopic and Thermodynamic Studies of Chlorophyll Containing Monolayers and Vesicles. Part I: Mixed Monolayers of Pheophytin A and Lecithin |
title_full_unstemmed |
Fluorescence Spectroscopic and Thermodynamic Studies of Chlorophyll Containing Monolayers and Vesicles. Part I: Mixed Monolayers of Pheophytin A and Lecithin |
title_sort |
fluorescence spectroscopic and thermodynamic studies of chlorophyll containing monolayers and vesicles. part i: mixed monolayers of pheophytin a and lecithin |
publisher |
Walter de Gruyter GmbH |
publishDate |
1978 |
url |
http://dx.doi.org/10.1515/znc-1978-5-613 http://www.degruyter.com/view/j/znc.1978.33.issue-5-6/znc-1978-5-613/znc-1978-5-613.xml https://www.degruyter.com/document/doi/10.1515/znc-1978-5-613/pdf |
genre |
DML |
genre_facet |
DML |
op_source |
Zeitschrift für Naturforschung C volume 33, issue 5-6, page 382-391 ISSN 1865-7125 0939-5075 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/3.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1515/znc-1978-5-613 |
container_title |
Zeitschrift für Naturforschung C |
container_volume |
33 |
container_issue |
5-6 |
container_start_page |
382 |
op_container_end_page |
391 |
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1766397282282897408 |