Adsorption of 1-Monoglycerides at the Hexane/Water Interface

Hayami, Yoshiteru; Motomura, Kinsi

doi:10.1006/jcis.1998.5863

Cited by 5 publications

(8 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The adsorption of monolaurin and monomyristin at the hexane/water interface has been measured at intermediate to higher pressures, showing surface activity decreasing modestly with chain length. 17,18 Extrapolation to the palmitin chain length shows that the surface activity of the monopalmitin, as indicated by the surface pressure at a given molar concentration in the range studied here, is about 40% of dipalmitin. On this basis, interference by trace monopalmitin with the pressure measurements given here will be completely negligible.…”

Section: Resultsmentioning

confidence: 95%

“…There appear to be no data at low surface pressures for O/W monolayers of glycerides adequate for estimating virial coefficients. For example, the extensive data of Hayami and Motamura 17,18 on monoglycerides adsorbed at the hexane/water interface do not go to sufficiently low pressures to give the virial coefficients directly, and possible association in the oil phase is not considered.…”

Section: Introductionmentioning

confidence: 97%

“…Apart from the body of information on the phospholipids summarized above, there are few low surface pressure isotherm studies on lipid monolayers at O/W interfaces adequate for estimating 2D virial coefficients from monolayer isotherms, which are mostly interpreted via equations of state. [13][14][15][16][17][18] Mono-and diglycerides are surface active in oil/water systems, as for example in numerous emulsions including those found in post-prandial fat absorption from the duodenum. There appear to be no data at low surface pressures for O/W monolayers of glycerides adequate for estimating virial coefficients.…”

Section: Introductionmentioning

confidence: 99%

“…There appear to be no data at low surface pressures for O/W monolayers of glycerides adequate for estimating virial coefficients. For example, the extensive data of Hayami and Motamura 17,18 on monoglycerides adsorbed at the hexane/water interface do not go to sufficiently low pressures to give the virial Pure n-heptane (HPLC grade, 99+%; low UV adsorption) was obtained from Aldrich Chemical Co. in multiple sealed 100 mL volumes packed under nitrogen and used as received. Each sample of heptane was used completely after opening.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Lateral Intermolecular Forces between Biomembrane Lipids in Two Dimensions: 1,2-Dipalmitin at the Heptane/Water Interface Compared with Phospholipids

Pallas

Pethica

2006

J. Phys. Chem. B

View full text Add to dashboard Cite

The lateral interaction forces between phospholipids in two-dimensional arrays are fundamental to understanding membrane biophysics. In previous studies the related thermodynamic functions have been measured for spread phospholipid monolayers at the oil/water interface over a range of temperatures and densities, and the two-dimensional virial coefficients obtained. These coefficients have been computed from a model that emphasizes the head group zwitterion interactions. In this study we examine the contribution of the diglyceride portion of phospholipid molecules to the lateral intermolecular forces. Measurements of the heptane/water interfacial tension as a function of the concentration of 1,2-dipalmitoyl glycerol (DP) in the heptane were made over a range of low surface pressures at 25 degrees C. Infrared measurements on the DP solutions show that the solutions are ideal. The results are interpreted to give two-dimensional virial coefficients for the adsorbed monolayer. The second virial coefficient B2(T) for DP is +0.31 nm2/molecule, in marked contrast to the much larger positive values found for the corresponding phospholipids at the same interface and temperature, and clearly indicating an attractive component to the lateral potentials of mean force between pairs of DP molecules. The contribution of the diglyceride moiety to the pair potentials of the phospholipids thus appears to be minor but not negligible. The differences in the second virial coefficients for DP and the phospholipids are interpreted primarily in terms of the orientation of the ester carbonyl dipoles, also drawing on spectroscopic and diffraction evidence from related structures.

show abstract

Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

“…There appear to be no data at low surface pressures for O/W monolayers of glycerides adequate for estimating virial coefficients. For example, the extensive data of Hayami and Motamura 17,18 on monoglycerides adsorbed at the hexane/water interface do not go to sufficiently low pressures to give the virial Pure n-heptane (HPLC grade, 99+%; low UV adsorption) was obtained from Aldrich Chemical Co. in multiple sealed 100 mL volumes packed under nitrogen and used as received. Each sample of heptane was used completely after opening.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lateral Intermolecular Forces between Biomembrane Lipids in Two Dimensions: 1,2-Dipalmitin at the Heptane/Water Interface Compared with Phospholipids

Pallas

Pethica

2006

J. Phys. Chem. B

View full text Add to dashboard Cite

show abstract

“…Adsorption of amphiphiles at oil/water interfaces either from the aqueous solutions or from oil solutions has been extensively studied because it advances fundamental understanding of organization and roles of amphiphile molecules at interfaces. One of the important issues among such studies is a phase transition of adsorbed films, and many papers have been reported on long-chain alcohols, − alkyl glycerides, , cholesterols, and some binary combinations of them − at oil/water interfaces. Furthermore, there are reports on the cationic surfactant-induced phase transition at the alkane/water interface and on the transition in oil thin films on water surface. , …”

Section: Introductionmentioning

confidence: 99%

Phase Transition and Domain Formation in the Gibbs Adsorbed Films of Long-Chain Alcohols

et al. 2009

View full text Add to dashboard Cite

The adsorption behavior of 1,1,2,2,-tetrahydroheptadecafluorodecanol (FC10OH), 1-eicosanol (C20OH), and their mixtures at the hexane solution/water interface is summarized briefly and examined from the viewpoints of interfacial tensions in the presence of domains, domain formation, and the correlation between the phase transition and the miscibility of film forming substances in the adsorbed films. The two-dimensional analogue of the Laplace equation showed that the interfacial tension is always higher in the presence of domains than that in the absence of them. The higher tendency of domain formation of FC10OH compared to C20OH is mainly ascribed to the excess Gibbs energy of mixing of fluorocarbon chains and hydrocarbon solvent being positive and to the interaction energy between domains being more stable against cohesion for FC10OH than for C20OH. The thermodynamic equations derived here suggested the heteroazeotropy in the phase diagram of adsorption and the temperature dependence of interfacial tension at the phase transition points, which are in accord with the experimental findings qualitatively.

show abstract

Adsorption of 1-Monoglycerides at the Hexane/Water Interface

Hayami¹,

Motomura²

1999

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

The interfacial tension of a hexane solution of 1-monolaurin against water was measured as a function of temperature and concentration under atmospheric pressure. The thermodynamic quantity changes associated with the adsorption of 1-monolaurin were evaluated and compared with those of the previously reported 1-monomyristin. The decrease of two carbon atoms in the hydrocarbon chain results in a slight expansion of the 1-monolaurin adsorbed film and in a slight decrease in entropy and energy changes compared with those of the 1-monomyristin system. The large negative value of the entropy change at a high concentration is related to the restricted orientation of the polar head group of 1-monolaurin at the hexane/water interface due to the strong interaction between the large hydrophilic group of 1-monolaurin and the water molecules, as in the 1-monomyristin system. The origin of the distinction in the entropy change behavior between the adsorption from the hexane phase and water phase was discussed. The usefulness of an easier calculation process for the partial molar entropy change is verified by comparison with the usual reliable value and with the entropy of adsorption. Copyright 1999 Academic Press.

show abstract

Adsorption of 1-Monoglycerides at the Hexane/Water Interface

Cited by 5 publications

References 20 publications

Lateral Intermolecular Forces between Biomembrane Lipids in Two Dimensions: 1,2-Dipalmitin at the Heptane/Water Interface Compared with Phospholipids

Lateral Intermolecular Forces between Biomembrane Lipids in Two Dimensions: 1,2-Dipalmitin at the Heptane/Water Interface Compared with Phospholipids

Phase Transition and Domain Formation in the Gibbs Adsorbed Films of Long-Chain Alcohols

Adsorption of 1-Monoglycerides at the Hexane/Water Interface

Contact Info

Product

Resources

About