Destabilization of Monoglyceride Monolayers at the Air-Aqueous Subphase Interface. 1. Kinetics

Feria, Julia de la Fuente; Patino, Juan M. Rodrı́guez

doi:10.1021/la00019a049

Cited by 36 publications

(13 citation statements)

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“…In addition, ethanol can disrupt protein-lipid interactions and competes for lipid hydrophobic binding sites on the protein molecule to create a complex with different interfacial activity. Finally, ethanol can interact with monoglycerides at the interface, and as a consequence of these interactions, a monoglyceride molecular loss from the interface could take place (38). On aqueous sucrose solutions ( Figs.…”

Section: Resultsmentioning

confidence: 99%

Surface tension of protein and insoluble lipids at the air‐aqueous phase interface

Niño

Patino

1998

J Americ Oil Chem Soc

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The surface activity of bovine serum albumin (BSA) in water and aqueous solutions of ethanol (0.5, 1.0, and 2.0 M) and sucrose (0.5 and 1.0 M) has been investigated over a range of protein concentrations (5-1.10 −5 , % w/w). The surface tension data were determined by the Wilhelmy plate method. Surface data at low protein concentrations indicate a low surface activity, which rises to a plateau as the monolayer is saturated at higher protein concentrations. The protein concentration and surface tension at the plateau depend on the aqueous phase composition. The effect of aqueous phase composition on BSA-lipid interactions has been investigated by spreading an insoluble lipid (monostearin or monoolein) on a film of BSA previously adsorbed on the interface. The existence of protein-lipid interactions depends on the protein/lipid ratio. The surface activity of mixed BSA-lipid films is determined by the lipid because the surface pressure of the mixed film is the same as the lipid equilibrium spreading pressure, and the monolayer is not saturated by BSA. However, the surface activity of mixed BSA-lipid films is determined by BSA as the monolayer is saturated by the protein.

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Section: Resultsmentioning

confidence: 99%

Surface tension of protein and insoluble lipids at the air‐aqueous phase interface

Niño

Patino

1998

J Americ Oil Chem Soc

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“…Several different mechanisms of relaxation processes taking place at multicomponent surface film under compression can be distinguished from the dynamic surface pressure relations like: desorption, dissolution, collapse, formation of surface micelles, evaporation, surface chemical reaction, Marangoni effect as summarized in Table 1 of Fuente-Feria & Patino (1994). They all lead to a certain film viscoelasticity, depending on the time scale of the film deformation.…”

Section: Environmental Factors Effect On Film Parametersmentioning

confidence: 99%

Surface Rheology Parameters of Source-Specific Surfactant Films as Indicators of Organic Matter Dynamics

2006

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The paper contains the results of natural film experiments carried out on inland and coastal waters in the Dead Vistula catchment area and mouth during 2000-2002, using the integrated Langmuir troughWilhelmy plate system. The static film parameters result from the generalized scaling procedures applied to the surface pressure-area isotherms. They appear to reflect in a quantitative and sensitive way the film composition (A lim , M w , E isoth ), film solubility and the miscibility of its components (via R, DS c and y factors), and surface concentration (p eq , G eq ). The adsorption kinetics parameters: effective diffusion coefficient D eff /D and activation energy barrier E a /RT are derived from dynamic surface pressure. There is a reason to suggest that certain classes of film-forming components or 'end-members' may dominate the static and dynamic surface properties. Variation in the surface rheological parameters of source-specific biosurfactants is postulated to reflect organic matter dynamics in natural waters and were measured for the Dead Vistula river, its tributaries and the adjacent coastal area.

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“…No significant hysteresis was observed at the compression rates studied. The stability of monostearin monolayers on water has previously been reported (Fuente Feria and Rodriguez Patino, 1994a). For a full explanation of this phenomenon it is necessary to determine the stability of the mixed monolayer.…”

Section: Thermodynamic Parametersmentioning

confidence: 98%

Binary mixture of monostearin‐distearin monolayers at the air–water interface

Feria

Patino

1995

AIChE Journal

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The study of mixed films has become of considerable interest both fiom theoretical and practical points of view. The 7~ -A isotherms of monostearin-distearin (about 50% 1,3-and 50% I,2-isomers) mixed films spread on water as a function of emulsifier ratio and temperature were studied in an automated Langmuir-type film balance. M e n molecules of both emulsifiers are spread on the air-water interface they are packed more closely together than when either emulsifier is present alone, and they enter into some form of association. This association can be demonstrated by surface pressure-area isotherms and by thermodynamic studies. The characteristics of the mixed films, their elasticity and miscibility, which are of interest in emulsion or foam stability, are discussed. A molecular model established can explain the interactions between film and subphase molecules and their relationships with variables of the process (pressure and temperature). This model fits the calculated thermodynamic parameters. will any of the single-component emulsifiers (Kako and Kondo, 1979). This stability is improved still further by incorporating protein in both mono-and diglycerides Sherman, 1983,1984;Rahman and Sherman, 1982;Reeve and Sherman, 1988). Interactions between proteins and lipids have been reported for model food systems in solutions or in emulsions (Coke et al.

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Destabilization of Monoglyceride Monolayers at the Air-Aqueous Subphase Interface. 1. Kinetics

Cited by 36 publications

References 0 publications

Surface tension of protein and insoluble lipids at the air‐aqueous phase interface

Surface tension of protein and insoluble lipids at the air‐aqueous phase interface

Surface Rheology Parameters of Source-Specific Surfactant Films as Indicators of Organic Matter Dynamics

Binary mixture of monostearin‐distearin monolayers at the air–water interface

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