Mixed Micelles
Mostrando 1-12 de 64 artigos, teses e dissertações.
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1. Interaction between cationic and conventional nonionic surfactants in the mixed micelle and monolayer formed in aqueous medium
Mixed micellization and surface properties of cationic and nonionic surfactants dimethyl decyl-, tetradecyl- and hexadecyl phosphineoxide mixtures are studied using conductivity and surface tension measurements. The models of Rubingh, Rosen, and Clint, are used to obtain the interaction parameter, minimum area per molecule, mixed micelle composition, free en
Química Nova. Publicado em: 2011
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2. Obtenção e caracterização de frações purificadas de saponinas de chenopodium quinoa e avaliação da formação de complexos do tipo iscom : atividades biológicas das frações e dos complexos formados
Chenopodium quinoa (quinoa) seeds are a rich protein source and well-known for their high saponin content. Chemically, quinoa saponins are triterpene glycosides being phytolaccagenic, hederagenin, oleanolic and serjanic acids the most common aglycones found in seeds. Its immunoadjuvant properties have been examined and the results obtained were conflicting.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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3. Formação de micelas mistas entre o sal biliar colato de sódio e o surfactante aniônico dodecanoato de sódio
Mixed-micelle formation between sodium chlolate (NaC) and the anionic surfactant sodium dodecanoate (SDoD) in Tris-HCl buffer solutions, pH 9.00, varying the molar fraction of the surfactants, was investigated by means of electrical conductivity and steady-state fluorescence of pyrene. The critical micelar concentration (cmc) was measured from the equivalent
Química Nova. Publicado em: 2008
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4. Interaction of hidrophilic porphyrins and extracellular hemoglobin with biomimetic models of biological membranes / Interação de porfirinas hidrofílicas e de hemoglobina extracelular com modelos biomiméticos de membrana biológica
In the first part of this work interactions of the cationic meso tetrakis (4-N-methilpyridil) porphyrin (TMPyP) and meso-tetrakis (4-sulfonatophenyl) porphyrin (TPPS4) in the free base forms with membrane model systems (ionic micelles, mixed micelles and phospholipids vesicles) in aqueous solutions, have been investigated by optical absorption, resonance lig
Publicado em: 2008
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5. Caracterização estrutural de agregados formados pelo antifúngico anfotericina B e lipídios catiônicos: uma possível formulação farmacológica / Structural characterization of aggregates formed by the antifungal drug amphotericin B and cationic lipids: a possible pharmacological formulation
Amphotericin B (AB) is a natural antibiotic, produced by Streptomyces nodosus, with a very potent antifungal activity. It is a polyene macrolide molecule, isolated in 1953. Since then, it has been extensively used in the treatment of systemic mycotic infections. Considering AB very low solubility in aqueous medium, it has been largely used as an aqueous disp
Publicado em: 2008
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6. Optimum adsorption of phospholipid bilayer on silica and reconstitution of receptor function. / Adsorção ótima de bicamada fosfolipídica sobre sílica e reconstituição do reconhecimento receptor-ligante
The general objective of this project was to continue evaluating the suitability of amphiphiles that aggregate in aqueous solution forming bilayers, to cover surfaces of silica. A secondary objective pursued was to promote the reconstitution of the receptor-ligand function, having as a model the monosialoganglioside GM1 and the enterotoxin of the choleric vi
Publicado em: 2006
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7. Micelas mistas de surfatantes zwiteriônicos e catiônicos: propriedades físico-químicas e efeito na cinética de reação unimolecular / Mixed micelles of zwiterionic and cationic surfactants: physical and chemical properties and kinetics effects in a unimolecular reaction
O interesse por sistemas formados por misturas de surfatantes se deve ao fato destas misturas apresentarem propriedades diferentes, e algumas vezes superiores, às dos surfatantes puros. Neste trabalho foram realizadas, em água e em soluções aquosas de sal, medidas de CMC, constantes de dissociação iônica, concentrações superficiais de contra-íons e
Publicado em: 2003
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8. The Micellar Sink: A QUANTITATIVE ASSESSMENT OF THE ASSOCIATION OF ORGANIC ANIONS WITH MIXED MICELLES AND OTHER MACROMOLECULAR AGGREGATES IN RAT BILE
Although the importance of mixed micelles in the solubilization and biliary excretion of lipids is established, little is known about a possible role of mixed micelles in the excretion of other biliary solutes. Ultrafiltration and ultracentrifugation techniques were used to investigate the interaction between substances that are excreted in bile and biliary
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9. Partitioning of octyl glucoside between octyl glucoside/phosphatidylcholine mixed aggregates and aqueous media as studied by isothermal titration calorimetry.
Stepwise dilution of lipid-surfactant mixed micelles first results in extraction of surfactant from the mixed micelles into the aqueous medium. Subsequently mixed micelles transform into vesicles, within a range of compositions that corresponds to equilibrium coexistence between these two types of aggregates. Further dilution results in extraction of surfact
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10. Inhibition of Amphotericin B (Fungizone) Toxicity to Cells by Egg Lecithin-Glycocholic Acid Mixed Micelles
Mixed micelles prepared from egg lecithin and the sodium salt of glycocholic acid markedly inhibited amphotericin B toxicity to mammalian cells without significantly affecting the antifungal effects of the drug.
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11. Structural characterization of the micelle-vesicle transition in lecithin-bile salt solutions.
Small-angle neutron scattering (SANS) and dynamic light scattering (QLS) are used to characterize the aggregates found upon dilution of mixed lecithin-bile salt micelles. Molar ratios of lecithin (L) to taurocholate (TC) studied varied from 0.1 to 1, and one series contained cholesterol (Ch). Mixed aggregates of L and taurodeoxycholate (TDC) at ratios of 0.4
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12. Isolation and properties of the mixed lipid micelles present in intestinal content during fat digestion in man.
To evaluate better the physicochemical characteristics of human fat digestion, a method was developed which allowed characterization of the bile acid-lipid mixed micelles of the aqueous phase of post-prandial duodenal fluid. Duodenal fluid was collected after a 36-g fat breakfast for two 90-min periods and for 60 min after i.v. cholecystokinin and was ultrac