On the possibility of molecular recognition of taste substances studied by Gábor analysis of oscillations

Płocharska-Jankowska, Elżbieta; Szpakowska, Maria; Mátéfi‐Tempfli, Stefan; Nagy, O. B.

doi:10.1016/j.bpc.2004.10.004

Cited by 15 publications

(17 citation statements)

References 7 publications

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“…Thus, a more objective and quantitative analysis of the responses of model taste sensors (or rather-sensors of different species added) would be very useful. That is why, inspired by the above works, Szpakowska et al continued studies of such model sensors [14,15] and have proposed [16,17] the analysis of the oscillations by means of Gábor approach [18]. The following experimental system was employed: the left aqueous phase contained a cationic surfactant-benzyldimethyltetradecylammonium chloride (BDMTAC) and ethanol, the middle organic phase (liquid membrane) was formed from the solution of picric acid in nitromethane, and the right aqueous phase contained various substances corresponding to different categories of taste: sucrose, citric acid, quinine hydrochloride, caffeine, KCl, glucose, acetic acid, lactose or fructose, in most cases as 0.1 M solutions.…”

Section: Electrochemical Model Of Taste Sensormentioning

confidence: 98%

Liquid Membrane and Other Membrane Oscillators

Orlik

2012

Self-Organization in Electrochemical Systems II

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In complement to the hydrodynamic instabilities driven by surface tension gradients, enclosed in Sects. 5.4-5.7, we describe here the dynamics of the liquid-liquid interface, formed by two fluids of very limited miscibility, e.g., by water and 2-nitropropane. First reports on this type of dynamical systems have been published by Dupeyrat and Nakache [1,2], and later analogous studies were continued also by .A representative example of that type of the systems is the water-2-nitropropane system [3]. The key point is that each phase should contain the dissolved species that is significantly better soluble in the other phase. In this way the initial state of such system is far from equilibrium and the natural trend to decrease the free Gibbs energy is the flow of each dissolved species to the other phase. In the example described here, the aqueous phase contains initially the hexadecyltrimethylammonium bromide (or cetyltrimethylammonium bromide, CTAB) the large organic CTA + cation of which exhibits, due to its hydrophobicity, higher affinity to the organic phase. In turn, the phase of 2-nitropropane contains initially dissolved picric acid (HA), better soluble and also partly dissociating in water (pK a % 0.2).When these two phases are brought into contact, with the organic layer placed over the aqueous layer, the oppositely directed flows of CTAB and HPi begin. This transport is associated with subtle oscillations of various characteristics: pH of aqueous solution, interfacial potential drop (Fig. 6.1), and interfacial tension. The latter phenomena are easily detectable as visible oscillations of the meniscus at the interface of both liquids. It is interesting that under such non-equilibrium conditions the presence of surfactant (CTAB) does not depress the surface tension gradients, but on the contrary, it is responsible for their periodic temporal variations.Yoshikawa and Matsubara [3] have proposed the mechanism of these oscillatory phenomena. First, one should note that CTA + cations in both phases form micelles above certain critical CTA + concentrations. Those micelles exhibit inverted M. Orlik, Self-Organization in Electrochemical Systems II, Monographs in Electrochemistry,

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Section: Electrochemical Model Of Taste Sensormentioning

confidence: 98%

Liquid Membrane and Other Membrane Oscillators

Orlik

2012

Self-Organization in Electrochemical Systems II

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“…In the first aqueous phase (donor phase, d), ionic surfactant is present, which is transferred to the second aqueous phase (acceptor phase, a) through the liquid membrane [1][2][3][4]. At the beginning, the system is far from equilibrium.…”

Section: Introductionmentioning

confidence: 99%

“…The possible use of these oscillators as taste sensors [2][3][4] or as models mimicking the sensing mechanism of taste [1] has brought about intensive research activities in this field [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of nitromethane liquid membrane oscillator containing sodium oleate

Szpakowska¹,

Magnuszewska²,

Nagy³

2008

Journal of Colloid and Interface Science

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“…Therefore, analysis of artificial oscillation will lead to the elucidation and modeling of biological membranes [5][6][7][8]. Furthermore, the application of oscillators as novel sensors has been investigated [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%