Adsorption of hydrophobic anions on phospholipid monolayers

Mau, Nicole Davion Van; Isaaurat, B; Amblard, G.

doi:10.1016/0021-9797(84)90002-x

Cited by 14 publications

(4 citation statements)

References 37 publications

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“…Specifically,asshown in Table 2, hydrophobic species display positive free energies of hydration, small enthalpies of hydration, and large positive heat capacities of hydration, [104][105][106] prerequisites that are not fulfilled by chaotropic ions.R ather,c haotropic anions can be classified as hydrophilic on ion-solvation scales. [107,108] Classifications of chaotropic ions as hydrophobic, occasionally found in the literature, [109][110][111][112][113][114][115][116][117][118][119] are unfortunate because they may lead to incorrect assignments in terms of the underlying driving force for associative processes.Vice versa, hydrophobic ions do actually exist, such as BPh 4 À , (C 2 F 5 ) 3 PF 3 À ,a nd AsPh 4 + , [80,[120][121][122] and it is also important not to label these as being superchaotropic [47,51,52,123] when sequences of ionic properties,s cales for ionic solvation, or reasons for aqueous assembly processes are being developed. Superchaotropic and hydrophobic ions are neighbors on the continuum solvation scale in Figure 1b(because they are both large and highly polarizable), but they would differ in terms of their surface charge density and dominant water-solvation pattern ( Figure 1a).…”

Section: Thermochemical Hydration Characteristicsmentioning

confidence: 99%

“…Rather, chaotropic anions can be classified as hydrophilic on ion‐solvation scales . Classifications of chaotropic ions as hydrophobic, occasionally found in the literature, are unfortunate because they may lead to incorrect assignments in terms of the underlying driving force for associative processes. Vice versa, hydrophobic ions do actually exist, such as BPh 4 − , (C 2 F 5 ) 3 PF 3 − , and AsPh 4 + , and it is also important not to label these as being superchaotropic when sequences of ionic properties, scales for ionic solvation, or reasons for aqueous assembly processes are being developed.…”

Section: Thermochemical Hydration Characteristicsmentioning

confidence: 99%

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The Chaotropic Effect as an Assembly Motif in Chemistry

2018

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Following up on scattered reports on interactions of conventional chaotropic ions (for example, I−, SCN−, ClO4 −) with macrocyclic host molecules, biomolecules, and hydrophobic neutral surfaces in aqueous solution, the chaotropic effect has recently emerged as a generic driving force for supramolecular assembly, orthogonal to the hydrophobic effect. The chaotropic effect becomes most effective for very large ions that extend beyond the classical Hofmeister scale and that can be referred to as superchaotropic ions (for example, borate clusters and polyoxometalates). In this Minireview, we present a continuous scale of water–solute interactions that includes the solvation of kosmotropic, chaotropic, and hydrophobic solutes, as well as the creation of void space (cavitation). Recent examples for the association of chaotropic anions to hydrophobic synthetic and biological binding sites, lipid bilayers, and surfaces are discussed.

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Section: Thermochemical Hydration Characteristicsmentioning

confidence: 99%

Section: Thermochemical Hydration Characteristicsmentioning

confidence: 99%

The Chaotropic Effect as an Assembly Motif in Chemistry

2018

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“…The above-mentioned physicochemical properties are reflected in the ion-pairing behavior of metallacarboranes, which in turn led to their known applications in extraction chemistry. − In several works concerning ion exchange reactions, the surface activity of the [ 1 ] - anion , (see Chart ) and the hexachlorinated derivative of the [ 1 ] - anion at the interface of two immiscible liquids was reported. Thus, the tendency of metallacarboranes to associate in aqueous solutions could be easily expected, even when they lack an amphiphilic topology.…”

Section: Introductionmentioning

confidence: 99%

Molecular Assembly of Metallacarboranes in Water: Light Scattering and Microscopy Study

et al. 2005

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Polyhedral metallacarboranes are used mainly as ion-pairing agents and recently have been recognized as potent inhibitors of HIV protease. They are characterized by exceptional hydrophobicity, rigid geometry, delocalized negative charge, ion-pairing behavior, and strong acidity of their conjugated acids. The completely novel phenomenon, association of these promising pharmaceutical tectons in aqueous solutions, is described here. The behavior of two structural types of metallacarboranes, [bis(1,2-dicarbollide)cobaltate(1-)] and bis[(3)-1,2-dicarbollylcobalt]-(3,6)-1,2-dicarbacanastide(2-)], in aqueous solution was studied by a combination of static and dynamic light scattering and microscopy methods. Spherical aggregates with radii of ca. 100 nm and fairly monodisperse nanostructures were found in aqueous solutions. The behavior of nanoaggregates is fairly complex and depends on the concentration and aging of the solutions. The particles are stabilized in the solution by counterions. The formation of larger clusters upon dilution of bis(1,2-dicarbollide)cobaltate(1-) solutions was observed. The secondary aggregation can be suppressed by addition of NaCl. Gel permeation chromatography measurements of sodium bis(1,2-dicarbollide)cobaltate(1-) show that the majority of matallacarborane molecules form nanoaggregates and only a small amount of the metallacarborane remains molecularly soluble or forms small oligomers.

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“…In the other hand, interactions of inorganic anions with a Langmuir film have been not so largely studied. Simple monovalent anions, like halide ions, have some condensing effects on positively charged films , or seem to expand the Langmuir films of some phospholipids. , A few other anions (such as HAsO 4 2- or MoO 4 2- ) present some interesting interactions with a zwitterionic lipid. − Finally, one should note that besides those studies, a large variety of organic ions or metal complexes have been organized along a Langmuir film. − …”

Section: Introductionmentioning

confidence: 99%

Adsorption of Inorganic Polyanions along a Langmuir Film: A Brewster Angle Microscopic Study

et al. 1998

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Interactions of large inorganic polyanions along a positively charged Langmuir film of dimethyldioctadecylammonium bromide were studied by Brewster angle microscopy (BAM). Because of their large size (>10 Å) and high refractive index, their adsorption along the organic monolayer induces an increase of the interface reflectivity and can be directly monitored by BAM. Furthermore, they strongly modify the morphology of the film and a coexistence of three phases (gaseous, liquid expanded, and liquid condensed) is easily obtained at a temperature close to 20 °C. Around this "triple point", nucleation of liquid-condensed domains is observed along the gaseous/liquid-expanded interface, inducing unusual structures such as strings of liquid-expanded domains. Those experiments demonstrate that inorganic/organic Langmuir films based on the semiamphiphilic ionic association could present a variety of morphologies as rich as those of classical amphiphilic molecules at the gas/water interface.

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Adsorption of hydrophobic anions on phospholipid monolayers

Cited by 14 publications

References 37 publications

The Chaotropic Effect as an Assembly Motif in Chemistry

The Chaotropic Effect as an Assembly Motif in Chemistry

Molecular Assembly of Metallacarboranes in Water: Light Scattering and Microscopy Study

Adsorption of Inorganic Polyanions along a Langmuir Film: A Brewster Angle Microscopic Study

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