The Interaction of Water with Lecithin Micelles in Benzene

Elworthy, P. H.; McIntosh, D. S.

doi:10.1021/j100794a002

Cited by 56 publications

(13 citation statements)

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“…The cmc of lecithin in hexadecane is expected to be in a comparable concentration range. The small micelles consist of 4 to 5 monomeric units of lecithin [28,29]. The size of reverse micelles formed in hydrocarbons is influenced by the amount of water present in the system: with minute amounts of water present depending on the micelle volume fraction spherical micelles of diameters between 4.8nm and 10.8nm have been determined by SANS in a cyclohexane-lecithinwater system [30].…”

Section: Resultsmentioning

confidence: 99%

Conductivity in nonpolar media: Experimental and numerical studies on sodium AOT–hexadecane, lecithin–hexadecane and aluminum(III)-3,5-diisopropyl salicylate–hexadecane systems

Schmidt

Prignitz

Peschka

et al. 2012

Journal of Colloid and Interface Science

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The conductivity behavior of doped hydrocarbon systems is studied by applying impedance spectroscopy. In the case of 3,5-diisopropyl salicylato aluminum (III) the charge carriers are formed by dissociation of the compound and their concentration is proportional to the square root of the solute concentration. In hydrocarbon systems that consist of micelle forming compounds (sodium AOT/ lecithin) a linear dependence of charge carrier concentration on solute concentration is observed in the concentration regime where micelles are present. The conduction mechanisms are studied by numerical solution of a Poisson-Nernst-Planck system that describes the charge transport. We follow two different approaches to extract the degree of micelle dissociation from the impedance data. Firstly, by computing the response of a linear approximation of the Poisson-Nernst-Planck model, and secondly by computing the fully nonlinear response from direct numerical simulations using finite elements. For high and moderate frequencies both approaches agree very well with the experimental data. For small frequencies the response becomes nonlinear and the concept of impedance fails. Furthermore, the numerically computed values for the degree of dissociation are of the same order of magnitude as the values obtained with classical formulas, but still differ by a factor of about 1/3. The direct numerical simulation allows new insight into the conduction mechanisms for different frequency regimes.

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Section: Resultsmentioning

confidence: 99%

Conductivity in nonpolar media: Experimental and numerical studies on sodium AOT–hexadecane, lecithin–hexadecane and aluminum(III)-3,5-diisopropyl salicylate–hexadecane systems

Schmidt

Prignitz

Peschka

et al. 2012

Journal of Colloid and Interface Science

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“…We can make a reasonable estimate of the extent of solubilization in the following way. Elworthy & McIntosh (1964) showed that lecithin micelles in benzene could solubilize water to the extent of 0-33 g/g lecithin. If we assume this figure for our results then the percentage of uptake due to solubilization varies from 5 to 8%.…”

Section: Discussionmentioning

confidence: 99%

Noradrenaline-phospholipid interactions

Cuthbert

Callingham

Warren

et al. 1967

Journal of Pharmacy and Pharmacology

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“…The ''hydration shells'' around the PC headgroups are reported to include between 1 [101,102] and 25 [103] moles of water per mole of lipid, utilizing various methods such as the isolation of mono- [102] and dihydrate of DPPC [104,105]; adsorption isotherms [106][107][108][109] and water distribution data Downloaded by [University of Auckland, New Zealand] at 19:03 04 June 2016 for two-phase systems [110]; a radiotracer technique using gel filtration [111]; hydrodynamic methods using viscosity [112,113] and ultracentrifugation [114] measurements; X-ray diffraction [102,[115][116][117][118]; calorimetry [30,32,[119][120][121] with different cooling protocols giving different results; and NMR spectroscopy [101,109,[122][123][124][125][126][127][128][129][130][131][132]. The ''hydration shells'' around the PC headgroups are reported to include between 1 [101,102] and 25 [103] moles of water per mole of lipid, utilizing various methods such as the isolation of mono- [102]...…”

Section: B Full Hydration Of the Surfactantmentioning

confidence: 99%

Subzero Temperature Behavior of Water in Microemulsions

Garti¹

2000

Surfactant Science

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The Interaction of Water with Lecithin Micelles in Benzene

Cited by 56 publications

References 0 publications

Conductivity in nonpolar media: Experimental and numerical studies on sodium AOT–hexadecane, lecithin–hexadecane and aluminum(III)-3,5-diisopropyl salicylate–hexadecane systems

Conductivity in nonpolar media: Experimental and numerical studies on sodium AOT–hexadecane, lecithin–hexadecane and aluminum(III)-3,5-diisopropyl salicylate–hexadecane systems

Noradrenaline-phospholipid interactions

Subzero Temperature Behavior of Water in Microemulsions

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