Effects of biologically important substances on spontaneous electrical potential oscillation across a liquid membrane of a water | octanol | water system

Quasi-elastic Laser Scattering for Measuring Inhomogeneous Interfacial Tension in Non-equilibrium Phenomena with Convective Flows

“…7,8,[43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] In all of the cases studied, the surfactants in the donor phase were considered to be dissolved in the membrane phase and to transfer into the acceptor phase, but the origin of the electric potential oscillations remains controversial. 43,46,47 One issue in previous studies, which has caused controversy, is that interfacial tension measurements at the donor/membrane and the membrane/acceptor interfaces have never been made simultaneously. We developed the dual-beam QELS method so as to allow these simultaneous measurements at the two interfaces, and to compare them with the behavior of the electric potential in order to clarify the contribution to oscillatory behavior at each interface.…”

Electrochemistry at liquid/liquid interfaces: methodology and potential applications

“…However, only very few studies deal with a systematic evaluation of lipophilicity, and Takamura and her co-workers [135,136] are perhaps the only up-to-now who established relationships between the pharmacological activity and the half-wave transfer potentials of various drugs, with good correlations found for series of hypnotic, anaesthetic, cholinergic and adrenergic agents.…”

“…The electrical potential oscillation has been used to qualitatively determine primary taste substances [177] and to relate the chemical structure and the hydrophobicity of a series of alcohols [174] and sugars [178] to their chemoreception. Such liquid membranes are expected to be useful for evaluating the pharmacological activity [179] and the taste of drugs [133], but it remains difficult to correlate the type and amplitude of the oscillation to physico-chemical parameters.…”

Spontaneous Oscillation Mechanism by Simultaneous Time-resolved Measurements of Interfacial Tensions of Both the Donor/Membrane and Membrane/Acceptor Phases

“…Considerable numbers of additional researchers have also reported oscillatory liquid membrane systems of varying compositions. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] In all cases, the surfactant in the donor phase is considered to be dissolved into the membrane phase and transferred to the acceptor phase. Conversely, the mechanism of the oscillatory behavior of liquid membranes has been the subject of controversy, and several mechanisms have been proposed.…”