Abstract
The surface pressure isotherms of all-trans retinal and dioleoyl-l-phosphatidylcholine at the nitrogen-water interface were studied at 20.5°C. The extrapolated limiting areas per molecule are 49 and 83 Å2 molecule-1, respectively. The properties of seven mixtures of all-trans retinal and dioleoyl-l-phosphatidylcholine, covering the whole range of molar fractions were also measured. The results show that an almost constant collapse pressure is observed at 44 ± 1 mN m-1 for all the mixtures studied. Furthermore, an apparent collapse pressure is also observed at 16, 18, 22, 26, 32, and 35 mN m-1 at a molar fraction of dioleoyl-l-phosphatidylcholine of 0.100, 0.200, 0.400, 0.500, 0.600, and 0.800, respectively. An analysis of the results in terms of the surface phase rule shows that below the apparent collapse pressure, the components are completely miscible. Negative deviations from ideality were observed in the region of miscibility for all the systems, as shown by the negative deviations to the additivity rule and the negative excess free energies of mixing calculated for all the systems at 5, 7, 10, and 13 mN m-1. Furthermore, it is shown that above the apparent collapse pressure, all-trans retinal is rejected from the monolayer, the rejection being total at the collapse pressure.
| Original language | English |
|---|---|
| Pages (from-to) | 606-613 |
| Number of pages | 8 |
| Journal | Journal of Colloid and Interface Science |
| Volume | 83 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jan 1 1981 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Colloid and Surface Chemistry
- Physical and Theoretical Chemistry
- Surfaces and Interfaces
Cite this
Interactions in mixed monolayers between dioleoyl-l-phosphatidylcholine and all-trans retinal. / Tancrede, Pierre; Parent, Luc; Paquin, Paul; Leblanc, Roger.
In: Journal of Colloid and Interface Science, Vol. 83, No. 2, 01.01.1981, p. 606-613.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Interactions in mixed monolayers between dioleoyl-l-phosphatidylcholine and all-trans retinal
AU - Tancrede, Pierre
AU - Parent, Luc
AU - Paquin, Paul
AU - Leblanc, Roger
PY - 1981/1/1
Y1 - 1981/1/1
N2 - The surface pressure isotherms of all-trans retinal and dioleoyl-l-phosphatidylcholine at the nitrogen-water interface were studied at 20.5°C. The extrapolated limiting areas per molecule are 49 and 83 Å2 molecule-1, respectively. The properties of seven mixtures of all-trans retinal and dioleoyl-l-phosphatidylcholine, covering the whole range of molar fractions were also measured. The results show that an almost constant collapse pressure is observed at 44 ± 1 mN m-1 for all the mixtures studied. Furthermore, an apparent collapse pressure is also observed at 16, 18, 22, 26, 32, and 35 mN m-1 at a molar fraction of dioleoyl-l-phosphatidylcholine of 0.100, 0.200, 0.400, 0.500, 0.600, and 0.800, respectively. An analysis of the results in terms of the surface phase rule shows that below the apparent collapse pressure, the components are completely miscible. Negative deviations from ideality were observed in the region of miscibility for all the systems, as shown by the negative deviations to the additivity rule and the negative excess free energies of mixing calculated for all the systems at 5, 7, 10, and 13 mN m-1. Furthermore, it is shown that above the apparent collapse pressure, all-trans retinal is rejected from the monolayer, the rejection being total at the collapse pressure.
AB - The surface pressure isotherms of all-trans retinal and dioleoyl-l-phosphatidylcholine at the nitrogen-water interface were studied at 20.5°C. The extrapolated limiting areas per molecule are 49 and 83 Å2 molecule-1, respectively. The properties of seven mixtures of all-trans retinal and dioleoyl-l-phosphatidylcholine, covering the whole range of molar fractions were also measured. The results show that an almost constant collapse pressure is observed at 44 ± 1 mN m-1 for all the mixtures studied. Furthermore, an apparent collapse pressure is also observed at 16, 18, 22, 26, 32, and 35 mN m-1 at a molar fraction of dioleoyl-l-phosphatidylcholine of 0.100, 0.200, 0.400, 0.500, 0.600, and 0.800, respectively. An analysis of the results in terms of the surface phase rule shows that below the apparent collapse pressure, the components are completely miscible. Negative deviations from ideality were observed in the region of miscibility for all the systems, as shown by the negative deviations to the additivity rule and the negative excess free energies of mixing calculated for all the systems at 5, 7, 10, and 13 mN m-1. Furthermore, it is shown that above the apparent collapse pressure, all-trans retinal is rejected from the monolayer, the rejection being total at the collapse pressure.
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U2 - 10.1016/0021-9797(81)90355-6
DO - 10.1016/0021-9797(81)90355-6
M3 - Article
VL - 83
SP - 606
EP - 613
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
IS - 2
ER -