This phase represents the most common arrangement of phospholipids in biological membranes. Although extensive research in this field has been done, there is still disagreement about emulsion structure and the influence of the emulsifier. Surfactants in Cosmetics. The first describes the adhesion of dispersed droplets, which yet remain single bodies. Figure 14.2. The ζ-potential of vesicles was measured at 25 °C using LEZA-600 (Otsuka Electronics Co. which is a laser doppler electrophoresis apparatus equipping with He-Ne laser (632.8 nm). The sn-1-chain typically shows an average of 16 C, whereas the sn-2-chain shows an average of 18 C. Naturally occurring unsaturated fatty acids are almost entirely of all-cis-conformation [Gennis, 1989]. Egg yolk is very rich in lecithin. Which structures occur within parenteral fat emulsions ? All studies on commercial samples reported here were undertaken with the respective up-to-date formulations (e.g. Particle sizes of homogenised emulsions are dependent on four key factors [Karbstein, 1994 / Schubert, 1997]: 1) ratio of emulsifier to dispersed phase Lecithin organogels have been reported to be thermo-reversible in nature and have a gel-to-sol transition of ~40°C [8].,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,<216::AID-EJLT216>3.0.CO;2-H,,,,,<40::AID-JBM6>3.0.CO;2-V,,,,,,,,,,,,,,,,,,,,,,,, Typical packing adaptations are explained by means of the ‘critical packing parameter’ (CPP), which is the ratio of effective volume v, head group area S0 and chain length lc (CPP = v/S0lc). <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 3) viscosity of the dispersed phase (can be reduced by elevating temperature) In lieu of an abstract, this is the article's first page. Current Opinion in Colloid & Interface Science. Selective enzymatic reactions using microemulsion-based gels. European Journal of Drug Metabolism and Pharmacokinetics. Hydrophobically modified ethyl(hydroxyethyl)cellulose as stabilizer and emulsifying agent in macroemulsions. COMBINED USE OF LECITHIN AND DECVL POLYGLUCOSIDE IN MICROEMULSIONS: DOMAIN OF EXISTENCE AND COSURFACTANT EFFECT. < 500) are transported more rapidly to the interface by diffusion and conduction, and can thus prevent coalescence on a time scale of milliseconds to a few minutes [Das and Kinsella, 1991 / Schubert, 1997]. Lysophospholipids (1)). The resulting hydrolysis products again would be surface active, with possible changes in emulsifier film properties and an influence on pH of the bulk water phase. Cosmet Toilet 1990; 105 (7):63-72. The contribution of negative surface charge (Zeta potential) of lecithin-stabilised emulsion droplets to their ability to withstand flocculation or coalescence has been frequently investigated. Lipomul® / Infonutrol® represents the second generation of parenteral fat emulsions now containing purified soya lecithins in combination with a synthetic emulsifier and the oil phase used consisted of cottonseed oil (Tab. 3). Asking the expert: Any potent active agents to treat excessive sweating? Lautenschlaeger, German Patent 4021082 (1990). Advances in Colloid and Interface Science. STRUCTURAL CHANGES IN W/O TRITON X-100/Cyclohexane-Hexanol/Water Microemulsions Probed by a Fluorescent Drug Piroxicam. ), PA + Ca2+, PS (pH<4), Tab. This causes a large emulsifier excess, which now forms the extensive liquid-crystalline structures reported [Westesen and Wehler, 1992]. You’ve supercharged your research process with ACS and Mendeley! J. Fagefors, K. Wannerberger, T. Nylander, O. Söderman. Christian von Corswant,, Sven Engström, and. An NMR Self-Diffusion Study of the Microstructure. Further, if the arcs joining adjacent molecules are equally inclined relative to the principal directions, the net twist (geodesic torsion integrated over the surface) also vanishes, containing equal components of positive and negative twist. Chromatographic analyses of the emulsifier composition together with Zeta Potential Measurements were used to follow chemical stability and its impact on the physical properties of the emulsions. In the case of Intralipid 10® and Lipofundin®10% and 20%, admixtures are explicitly forbidden by the manufacturer, whereas for Intralipid 20® or Lipovenoes 20%® these are regarded as being possible taking due care. Each of these consists of a number of oligomers containing various alkyl substituents. x�+��*�@02M����L�[�+$��r�{�&��)��+@� od" Kyung-Mi Park, Mi-Kyung Lee, Ki-Jun Hwang, Chong-Kook Kim. 5). 7 0 obj ISOTHERMAL DIFFUSION AND INTRADIFFUSION IN SURFACTANT SOLUTIONS. The addition of minor components and their effect on interfacial properties using droplet/interface coalescence kinetics was investigated.

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