Equation of state for monomolecular films of melittin at air-water interface

Birdi, K. S.; Gevod, V. S.; Ksenzhek, O.S.; Stenby, Erling Halfdan; Rasmussen, Kaare Lund

doi:10.1007/bf01410951

Cited by 9 publications

(16 citation statements)

References 20 publications

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“…Melittin was used as supplied by Sigma, U.S.A. A purified melittin sample was also used [2] which gave similar data as the Sigma quality. C12H2sSO4Na (SDS) was used as supplied by B.D.H., U.K.. Na-n-eicosyl sulfate (C20SO4Na) and n-eicosyl trimethyl W 167 ammonium bromide (C20NBr) were used as supplied by Schuchardt, W. Germany.…”

Section: Experimental and Methodsmentioning

confidence: 99%

“…KC1 was added in solid form with stirring; details described in Ref. [2,3]. The surface tension was measured by using the Wilhelmy (platinum) plate method [6].…”

Section: Experimental and Methodsmentioning

confidence: 99%

“…H -A isotherm of spread monolayer of melitrin was measured by a Langrnuir balance [2,3]. The surface area was changed from 743 cm 2 to 117 cm 2 at a rate of 4 min./cycle.…”

Section: Experimental and Methodsmentioning

confidence: 99%

“…In bilayers the peptide is reported to form channels which exhibit anion selective properties [1,4,5]. Analogous to this, addition of C1-to the surface film of melittin gives rise to a change in surface pressure,/7, and surface potential, Ag', as shown by us elsewhere [2].…”

Section: Introductionmentioning

confidence: 91%

“…This study is a continuation of systematic investigations which are being carried out in this laboratory on the surface activity behaviour of melittin [2,3] and other protein monolayers [6].…”

Section: Introductionmentioning

confidence: 99%

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Melittin and ionic surfactant interactions in monomolecular films

Birdi

Gevod²

1987

Colloid & Polymer Sci

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Abstract:The interaction between the anionic and cationic surfactants with Melittin spread monolayers at the air-water interface was investigated. The addition of anionic C1-, under the films of Melktin gives rise to a change in both surface pressure and surface potential. These interactions are different when surfactants are present, due to specific interactions between Melittin and the ionic-surfactants.

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Section: Experimental and Methodsmentioning

confidence: 99%

“…KC1 was added in solid form with stirring; details described in Ref. [2,3]. The surface tension was measured by using the Wilhelmy (platinum) plate method [6].…”

Section: Experimental and Methodsmentioning

confidence: 99%

“…H -A isotherm of spread monolayer of melitrin was measured by a Langrnuir balance [2,3]. The surface area was changed from 743 cm 2 to 117 cm 2 at a rate of 4 min./cycle.…”

Section: Experimental and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Melittin and ionic surfactant interactions in monomolecular films

Birdi

Gevod²

1987

Colloid & Polymer Sci

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Self-Assembly Monolayer Structures of Lipids and Macromolecules at Interfaces

Birdi¹

2002

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PREFACEThe information that science can extract from molecules that are essential for the processes of life can lead to better understanding of those processes. In natural selection during evolution (both prebiotic and biotic), physicochemical forces have been featured. A specific class of molecules, the amphiphiles, in aqueous environments exhibit self-assembly properties at liquid and solid interfaces. Such properties when combined with other forces require a special analysis. Of the self-assembly properties of amphiphiles, one is the formation of monomolecular films at both liquid-air and solid-air interfaces. During the last few decades, much has been reported in the literature on the formation of insoluble self-assembly monolayer (SAM) films of lipids and macromolecules (synthetic polymers and biopolymers) on the surface of water or at oil-water interfaces.The phenomenon of monolayer self-assembly has attracted considerable attention as a means of controlling molecular structures at interfaces. Studies of monomolecular films have been found to provide much physicochemical information on a molecular scale, which is useful for understanding many industrial and biological phenomena. For instance, the information obtained from lipid monolayer studies has been useful in determining the forces that stabilize various SAM structures found in lipid bilayers, vesicles, biological cell membranes, virus-cell fusion, emulsions, foams and films, and other self-assemblies. Current texts generally devote a single chapter to the characteristics of spread monolayers on liquids, and a researcher may have to look up a few hundred references to determine the procedures needed to investigate or analyze a particular phenomenon. Furthermore, there is an urgent need at this time for a text that discusses the state of the art regarding the surface phenomena exhibited by lipids and biopolymers, as they are relevant to a wide variety of surface and interfacial processes. During the last decade, the study of SAMs on solid surfaces has been aided greatly by developments in scanning tunneling microscopy (STM) and atomic force microscopy (AFM).The purpose of this book is to bring the reader up to date with the most recent experimental and the theoretical developments in relation to SAMs at liquid and solid surfaces. It is my intention to lead the researcher through the vast literature in such a way that he or she will be able to pursue particular investigation with suitable guidance. Such investigations may be industrial (emulsions, foams, dispersions, enhanced oil recovery, nonlinear optics) or biological [lipid-phase transitions, vesicles (drug targeting); bilayers, membranes, ion transport through membranes, sensors] in nature. The treatment in different parts of the text is based on the fundamental concepts of classical thermodynamics of surfaces (interfaces), i.e., the Gibbs adsorption theory. A large amount of experimental data from the literature has been included and critically examined from a vii viii PREFACE theoretical viewpoint...

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