Enhanced ion transfer rate due to the presence of zwitterionic phospholipid monolayers at the ITIES

Manzanares, José A.; Allen, R. M.; Kontturi, Kyösti

doi:10.1016/s0022-0728(00)00032-2

Cited by 35 publications

(42 citation statements)

References 34 publications

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“…Until recently, four electrode voltammetric measurements at the interface of two immiscible electrolyte solutions were the only tool for measuring the lipophilicity of single ions [1][2][3][4][5][6][7][8][9][10][11]. The weakness of this technique is mainly due to the presence of electrolytes in both the organic and the aqueous phases.…”

Section: Introductionmentioning

confidence: 99%

The determination of standard Gibbs energies of transfer of cations across the nitrobenzene|water interface using a three-phase electrode

Scholz

Gulaboski

Caban

2003

Electrochemistry Communications

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A three-phase electrode consisting of a droplet of a nitrobenzene solution of iron(III) tetraphenyl porphyrine chloride (Fe(III)-TPP-Cl) attached to a graphite electrode and immersed in an aqueous electrolyte solution was applied to determine the standard Gibbs energies of transfer of cations between water and nitrobenzene. The reduction of Fe(III)-TPP-Cl prompts the transfer of the cations from the aqueous to the organic phase. The system is chemically and electrochemically reversible.

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Section: Introductionmentioning

confidence: 99%

The determination of standard Gibbs energies of transfer of cations across the nitrobenzene|water interface using a three-phase electrode

Scholz

Gulaboski

Caban

2003

Electrochemistry Communications

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“…The kinetics of interfacial ion transfer was interpreted by several mechanisms [1,30], but the Butler -Volmer equation is still widely used [30,31]. The current depends on the total potential difference across the liquid/liquid interface:…”

Section: Kinetics Of Anion Transfermentioning

confidence: 99%

“…where k 0 is an apparent standard rate constant that depends on the potential distribution in the aqueous diffuse layer and the organic diffuse layer of the interface [30], and α it is a transfer coefficient that may depend on the concentration of ions [1]. However, we assume that both k 0 and α it are constants and that double layer corrections can be neglected [31].…”

Section: Kinetics Of Anion Transfermentioning

confidence: 99%

Kinetics of electrode reaction coupled to ion transfer across the liquid/liquid interface

Komorsky‐Lovrić

Lovrić

2005

Open Chemistry

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In the theoretical model it is assumed that a graphite disk electrode is covered by a thin film of solution of decamethylferrocene (dmfc) and some electrolyte CX in nitrobenzene and immersed in an aqueous solution of the electrolyte MX. Oxidation of dmfc is accompanied by the transfer of anion X − from water into nitrobenzene since it is also assumed that cations dmfc + and C + are insoluble in water and cation M + is insoluble in nitrobenzene. Kinetic parameters of the electrode reaction can be determined if the total potential difference across the nitrobenzene/water interface is maintained constant by adding the electrolytes CX and MX in concentrations which are much higher than the initial concentration of dmfc in nitrobenzene.

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“…[22,23] In the study of ion/drug transfer across a lipid monolayer, electrochemical methodology becomes more convenient than Langmuir techniques. [14,19,22,23,[33][34][35] When a potential difference is applied to the ITIES, the charge is separated across the ITIES through the formation of electrical doublelayers, [3] which are affected by the presence of phospholipid monolayers [14,15,36] that in turn affect the ion transfer rate. 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.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the shapes of capacitance curves of the long-chain PCs (C > 22) were flatter, exhibiting minimum capacitances over potential regions of 100 mV, compared to the parabolic-shaped capacitance curves of the shortchain lipids (C < 22). [4,6,22,23,36,32] …”

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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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Enhanced ion transfer rate due to the presence of zwitterionic phospholipid monolayers at the ITIES

Cited by 35 publications

References 34 publications

The determination of standard Gibbs energies of transfer of cations across the nitrobenzene|water interface using a three-phase electrode

The determination of standard Gibbs energies of transfer of cations across the nitrobenzene|water interface using a three-phase electrode

Kinetics of electrode reaction coupled to ion transfer across the liquid/liquid interface

Electrochemical Properties of Phospholipid Monolayers at Liquid–Liquid Interfaces

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