Monolayer Formation of Dilauroylphosphatidylcholine at the Polarized Nitrobenzene–Water Interface

Kakiuchi, Takashi; Yamane, Masataka; Osakai, Toshiyuki; Senda, Mitsugi

doi:10.1246/bcsj.60.4223

Cited by 49 publications

(39 citation statements)

References 12 publications

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“…4) shows that there is almost no difference between the shapes of the κ curves in the absence and the presence of lipid (only κ plots in the presence of PC are shown), although the κ curves in the presence of lipid always lie slightly lower than that in pure water. This demonstrates that there are no other ionic species than HTA + and Br − ions and the lipid monomers, if they exist, are present only at the interface or in the form vesicles or mixed micelles (7,10). Thus, the κ behavior of HTAB in aqueous PC, DPC, and PPC is always similar to that in pure water.…”

Section: Resultsmentioning

confidence: 82%

“…Solubilization of such amphiphilic macromolecules is generally achieved by using an appropriate surfactant, which forms mixed micelles with the lipid aggregates (2)(3)(4)(5)(6). Owing to their amphiphilic nature, phospholipids form monolayers at an immiscible interface such as of air/water (7), and their physical state in the bulk phase depends upon their concentration (6).…”

mentioning

confidence: 99%

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Aggregated assemblies of hexadecyltrimethylammonium bromide and phospholipids at the interface and in the bulk solution

Sehgal

Doe

Bakshi

2002

J Surfact & Detergents

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Interactions between hexadecyltrimethylammonium bromide (HTAB) and L-α-phosphatidylcholine (PC), 1,2-didecanoyl-sn-glycero-3-phosphocholine (DPC), and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (PPC) at the air/water interface and in the bulk solution were evaluated using interfacial tension, fluorescence, and conductivity measurements to study the aggregation processes of HTAB in fixed concentrations of aqueous lipid solutions containing 7-36 µM of each lipid. The interfacial and fluorescence measurements showed the occurrence of two kinds of aggregation processes in HTAB-PC and HTAB-DPC systems, which were identified by the three breaks at low lipid concentrations, i.e., 7-14 µM. The first aggregation process, C 1 , involved the incorporation of HTAB monomers into the lipid vesicles and the subsequent disruption of the vesicular structure leading to the formation of mixed micelles. The second aggregation process, C 2 , which started at the second break, indicated the completion of the mixed micelles and the initiation of independent micelle formation process which was completed at the third break. At higher PC or DPC concentration, i.e., 14-22 µM, the first break, which indicated the initiation of the first aggregation process, was not observed; only the second and third breaks were visible. This is ascribed to the presence of comparatively large vesicles, which were able to accommodate HTAB monomers initially without any drastic change in their architecture. In the presence of PPC, the aggregation process of HTAB was similar to that in pure water as studied from the interfacial tension measurements, whereas the bulk behavior indicated the presence of strong structure transitions upon incorporation of HTAB monomers in the PPC vesicles. A difference between the aggregation behaviors of HTAB with PPC was explained on the basis of the stronger hydrophobicity of PPC over PC and DPC.Paper no. S1255 in JSD 5, 123-130 (April 2002).

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Section: Resultsmentioning

confidence: 82%

mentioning

confidence: 99%

Aggregated assemblies of hexadecyltrimethylammonium bromide and phospholipids at the interface and in the bulk solution

Sehgal

Doe

Bakshi

2002

J Surfact & Detergents

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“…In Figure 1 b is depicted an interfacial interaction at the ITIES via calcium ions between a phospholipid monolayer deposited in an organic phase and a polysaccharide chain (dextran sulfate, DS) deposited in an aqueous phase. [14] Interfacial tension [5,19,22,24,[37][38][39] and capacitance [21,25,26,37] measurements are widely used to study the physiochemical properties of the phospholipid monolayers at the ITIES. These techniques are useful to elucidate the monolayer stability's strong dependence on the potential difference across the aqueous and the organic phases, on the pH of the aqueous phase, as well as on the nature of the aqueous cation, both affecting the ionic state of the phospholipid.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Properties of Phospholipid Monolayers at Liquid–Liquid Interfaces

Santos¹,

Garcı́a-Morales²,

Pereira³

2010

ChemPhysChem

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Biomembrane models built at the interface between two immiscible electrolytes (ITIES) are useful systems to study phenomena of biological relevance by means of their electrochemical processes. The unique properties of ITIES allow one either to control or measure the potential difference across the biomimetic membranes. Herein we focus on phospholipid monolayers adsorbed at liquid-liquid interfaces, and besides discussing recent developments on the subject, we describe electrochemical techniques that can be used to get insight on the interfacial processes and electrostatic properties of phospholipid membranes at the ITIES. In particular, we examine the electrochemical and physicochemical properties of (modified) phospholipid monolayers and their interaction with other biologically relevant compounds. The use of liquid-liquid electrochemistry as a powerful tool to characterize drug properties is outlined. Although this review is not a survey of all the work in the field, it provides a comprehensive referencing to current research.

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“…Freiser et al [1][2][3][4][5] studied the transfer of the metallic ions which moved across the liquid/liquid interface by using voltammetry. Senda et al [6][7][8][9] investigated the ion transfer across the water/nitrobenzene interface by electrochemical methods, and discussed the reaction parameters for various cation transfers. Reymond et al 10 developed an analytical method which used the half-wave potential, assuming that the diffusion coefficients are constant, and reported the complex stoichiometry (ratio of metallic ion to ligand) was related to concentrations of metallic ion and ligand.…”

Section: Introductionmentioning

confidence: 99%

Studies on Electrochemical Solvent Extraction of Metal Ions at Water/1,2-dichloroethane Interface

2001

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Solvent extraction is one significant method to separate many kinds of metals. The solvent extraction involves the process by which a metal complex moves from aqueous phase to organic phase. The electrochemical study has been applied to the investigation of the interface between two immiscible electrolyte solutions (ITIES) because of the following advantages. An ionic transfer reaction rate at the interface can be controlled easily by the interfacial potential difference (or current). Therefore, it is possible to carry the metal complex across ITIES by the electrochemical driving force when the metal complex has an electrical charge. Freiser et al. [1][2][3][4][5] studied the transfer of the metallic ions which moved across the liquid/liquid interface by using voltammetry. investigated the ion transfer across the water/nitrobenzene interface by electrochemical methods, and discussed the reaction parameters for various cation transfers. Reymond et al. 10 developed an analytical method which used the half-wave potential, assuming that the diffusion coefficients are constant, and reported the complex stoichiometry (ratio of metallic ion to ligand) was related to concentrations of metallic ion and ligand. Furthermore, Reymond et al. 11 derived the theoretical expressions of the half-wave potential for transfer mechanisms by interfacial complexation/decomplexation (TIC/TID mechanism), by organic phase complexation (TOC mechanism) and by aqueous phase complexation (ACT mechanism). They reported that the complex of Pb(II) and 1,4,7,10-tetrathiacyclododecane (TTCD) had the multiple stoichiometries of 1:1 and 1:2 (metallic ion to ligand) in the transfer across water/1,2-dichloroethane (DCE) interface. Liu et al. 12 measured the voltammograms for transfer of Cd(II), Mg(II), Co(II), Zn(II), Cu(II) and Ni(II) across ITIES by using an ascending water electrode (AWE) and a stationary water electrode (SWE) system.Itagaki et al. 13 applied an electrochemical impedance spectroscopy (EIS) to the analysis of the solvent extraction of some metals. They examined the rate of solvent extraction and the correlation of the extraction rate and the distribution constant. The EIS discriminates the elementary steps in the solvent extraction, namely, the diffusion in aqueous and organic phases, and the charge transfer across ITIES. The authors 14 discussed the charge transfer mechanism of Mn(II) extracted by HQ into DCE by EIS, and showed that the measurement of EIS gave the rate constant and the interfacial capacitance. The authors 15,16 extended this method to analyses of the solvent extraction of Co(II) and Ni(II). In the previous work, 16 the Ni(II) species extracted by electrochemical driving force were confirmed by the in-situ determination of absorbance by spectrophotometry with an optical fiber system. Aprahamian et al. 17 and Watanabe et al. 18 measured rate constants of solvent extraction at the liquid/liquid interface by accelerating extraction rate with high-speed solvent stirring. Contrary to this, the rate constant at a stati...

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Monolayer Formation of Dilauroylphosphatidylcholine at the Polarized Nitrobenzene–Water Interface

Cited by 49 publications

References 12 publications

Aggregated assemblies of hexadecyltrimethylammonium bromide and phospholipids at the interface and in the bulk solution

Aggregated assemblies of hexadecyltrimethylammonium bromide and phospholipids at the interface and in the bulk solution

Electrochemical Properties of Phospholipid Monolayers at Liquid–Liquid Interfaces

Studies on Electrochemical Solvent Extraction of Metal Ions at Water/1,2-dichloroethane Interface

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