Interactions in mixed monolayers between dioleoyl-l-phosphatidylcholine and all-trans retinal

Tancrède, Pierre; Parent, L.; Paquin, Paul; Leblanc, Roger M.

doi:10.1016/0021-9797(81)90355-6

Cited by 27 publications

(9 citation statements)

References 17 publications

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“…Consequently, the DLiPE monolayer on an IEW subphase remained in a liquid-expanded (LE) state throughout the compression (Fig. 1 b), which is consistent with earlier reports concerning, e.g., dioleoyl-PE (DOPE) (Chapman et al, 1966) and dioleoyl-PC (DOPC) (phosphocholine) (Tancrede et al, 1981). The almost identical extrapolated mean molecular area of ϳ80 Å 2 /molecule obtained for DLiPE, DOPE, and DOPC shows that the packing of the molecules at high surface pressure is controlled by the cis-unsaturated acyl chains and is almost independent of the degree of unsaturation.…”

Section: Methodssupporting

confidence: 91%

UV-Induced Reaction Kinetics of Dilinoleoylphosphatidylethanolamine Monolayers

Peltonen

1999

Biophysical Journal

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The UV-induced reactivity of dilinoleoylphosphatidylethanolamine (DLiPE) Langmuir and Langmuir-Blodgett films has been studied by in situ measurements of the changes in the mean molecular area, UV-vis and Fourier transform infrared spectroscopy, and atomic force microscopy (AFM). Optimum orientation and packing density of the DLiPE molecules in the monolayer were achieved by adding uranyl acetate to the subphase. A first-order reaction kinetic model was successfully fitted to the experimental reaction kinetics data obtained at a surface pressure of 30 mN/m. Topographical studies of LB films by AFM were performed on bilayer structures as a function of subphase composition and UV irradiation time. The orientational effect of the uranyl ions on the monolayer molecules was observed as an enhanced homogeneity of the freshly prepared monomeric LB films. However, the long-term stability of these films proved to be bad; clear reorganization and loss of a true monolayer structure were evidenced by the AFM images. This instability was inhibited for the UV-irradiated films, indicating that the UV irradiation gave rise to a cross-linked structure.

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Section: Methodssupporting

confidence: 91%

UV-Induced Reaction Kinetics of Dilinoleoylphosphatidylethanolamine Monolayers

Peltonen

1999

Biophysical Journal

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“…These features both vary with composition, and occur at approximately the same molecular area as that of the onset of the transition point pressure. The rapid decrease in S$ in this range is not attributed to an increase in optical absorption, but rather to increasing film thickness (25), and is in agreement with the model for partial or total rejection of the more easily collapsible component, Chl a, out of the monolayer (26,27). A change in slope in the SA-A isotherms is also observed in this molecular area range.…”

Section: Discussionsupporting

confidence: 85%

Monolayer properties of mixed chlorophyll a-digalactosyldiacylglycerol at the nitrogen–water interface

Ducharme¹,

Shibata²,

Munger³

et al. 1991

Can. J. Chem.

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. Can. J. Chem. 69, 1475 (1991). Surface pressure, surface potential, and ellipsometric-area isotherms have been measured to investigate the properties of chlorophyll a -digalactosyldiacylglycerol monolayers at the nitrogen -water interface. The surface pressure -area isotherms of the mixed film show a pronounced negative deviation with respect to ideality, whereas the surface potential isotherms follow the additivity law for mixed films. As the mole fraction of Chl a increases from 0.1 to 0.5, each of the corresponding ellipsometric isotherm is shifted towards more negative values in the liquid expanded region. As the mole fraction is increased above 0.5, the ellipsometric 6A values become more positive, with this trend continuing throughout the 0.5 to 0.9 mole fraction range. The combined effects of anisotropy in both the refractive indices and the absorption coefficient can explain the turnover observed in the ellipsometric 6A isotherms as the mole fraction of Chl a becomes larger than 0.5.Hydrophilic interactions have been ruled out on the basis of the agreement with the additivity law, which is observed for surface potentials of the mixed monolayers. The observed deviation exhibited in the T-A isotherms is interpreted in terms of the intermolecular cavity effect.

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“…The retinal molecules have structural formulae similar to retinol in that they have a cyclohexen ring with a branched hydrocarbon chain containing several double bonds and an aldehyde end group instead of an alcohol group characteristic of all-trans retinol. The limiting areas and the collapse pressures obtained by Tancrède et al (8,9) for the all-trans retinal were 48 Å 2 /molecule and 15.4 mN/m and for the 11-cis isomer were 49 Å 2 /molecule and 12.8 mN/m, respectively. From this comparison, it appeared obvious that all-trans retinol molecules relative to retinal were not only more compactly arrayed at the interface but they also exhibited a lower (by 2 mN/m) collapse pressure.…”

Section: Amphiphilic Properties Of Retinol Studied At the Air-water Imentioning

confidence: 70%

Drug–Cyclodextrin Association Constants Determined by Surface Tension and Surface Pressure Measurements

Angelova

Ringard-Lefebvre

Baszkin

1999

Journal of Colloid and Interface Science

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Interactions in mixed monolayers between dioleoyl-l-phosphatidylcholine and all-trans retinal

Cited by 27 publications

References 17 publications

UV-Induced Reaction Kinetics of Dilinoleoylphosphatidylethanolamine Monolayers

UV-Induced Reaction Kinetics of Dilinoleoylphosphatidylethanolamine Monolayers

Monolayer properties of mixed chlorophyll a-digalactosyldiacylglycerol at the nitrogen–water interface

Drug–Cyclodextrin Association Constants Determined by Surface Tension and Surface Pressure Measurements

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