Micellar Systems
Mostrando 13-24 de 33 artigos, teses e dissertações.
-
13. Análise do comportamento iônico em sistemas constituídos por micelas aniônicas, zwitteriônicas ou vesículas catiônicas: uma abordagem teórica por aproximação de campo médio / The analysis of ionic properties in anionic and zwitterionic micelles or cationic vesicles systems: a mean field theoretical approach
Membranes and organelles are structures present in biological systems. Such structures are interfaces between electrolytes. Addressing to the description, interpretation and comprehension of the ionic distribution around the structures an attempt is done is this work analyzing experimental results from the investigation of the following systems: 1) SDS micel
Publicado em: 2006
-
14. Purificação da enzima glicose-6-fosfato desidrogenase por sistemas micelares de duas fases aquosas contendo ligantes de afinidade / Glucose-6-phosphate dehydrogenase purification by two-phase aqueous micellar systems with affinity ligands
O presente trabalho teve como objetivo a purificação da enzima glicose-6-fosfato desidrogenase pela tecnologia de extração líquido-líquido em Sistemas Micelares de Duas Fases Aquosas (SMDFA). Estes sistemas são constituídos por soluções de tensoativos contendo micelas e oferecem ambientes hidrofóbico e hidrofílico, o que possibilita seletividade
Publicado em: 2006
-
15. Two-phase aqueous micellar systems: an alternative method for protein purification
Two-phase aqueous micellar systems can be exploited in separation science for the extraction/purification of desired biomolecules. This article reviews recent experimental and theoretical work by Blankschtein and co-workers on the use of two-phase aqueous micellar systems for the separation of hydrophilic proteins. The experimental partitioning behavior of t
Brazilian Journal of Chemical Engineering. Publicado em: 2004-12
-
16. Changes in aggregate form, size and flexibility along phase sequences in lyotropic liquid crystals
A comparison is made between existing theories for self-assembling systems and experimental phase diagrams of complex systems made up of amphiphile/water/additives, with emphasis on phase transitions by changes in concentration. Evidence for different types of hexagonal (H) phases, in systems with detergent and lipid amphiphiles, are reviewed. It is shown th
Brazilian Journal of Physics. Publicado em: 2002-06
-
17. Um estudo da interação entre ions aromaticos e micelas, em cristais liquidos liotropicos nematicos e em soluções isotropicas, por ressonancia magnetica nuclear
The interaction between ions and the electric double layer of micelles and biological membranes depends on a balance between the electrostatic torces and the hydrophobic effect. In this work, the interaction of the ions anilinium, benzoate, p-toluenesulfonate and benzenesulfonate with micelles was studied in nematic Iyotropic liquid crystals and isotropic so
Publicado em: 2001
-
18. Reações de transferência de acila em microemulsões água/óleo: hidrólise de benzoatos de fenila catalisada pelo ânion o-iodosobenzoato. / Acyl-transfer reactions in water/oil microemulsions: phenyl benzoates hydrolysis catalysed by the o-iodosobenzoate anion.
The mechanism of hydrolysis of the following two series of phenylbenzoate esters catalyzed by 1-oxi-1,2-benziodoxol-3(1H)-one (o-iodosobenzoate anion, IBA-), was studied in water-in-oil microemulsion (W/O mE) of benzylhexadecyl- dimethylammonium chloride (CBzCl) in benzene. 4-nitrophenyl 4-X-benzoates (X= NO2, CN, Cl and H) and Y-nitrophenyl 4-nitrobenzoates
Publicado em: 1997
-
19. ESTUDO DE SISTEMAS MICELARES NOS ESTADOS ISOTROPICO E LIQUIDO - CRISTALINO / Micellar systems liquid-crystalline phases by SAXS
Foram estudadas fases micelares do sistema lauril (dodecil) sulfato de sodio (sls)/agua/decanol nos estados isotropico i e liquido-cristalino por espalhamento de raios-x com enfase nas transicoes de fase iSETAhexagonal hALFA e iSETAnematica nc. O estudo das posicoes do pico intermicelar no sistema binario sls/agua, indica que as micelas sao estaveis e leveme
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/08/1991
-
20. Estudo dos ions benzenossulfonato, benzoato e anilinio em soluções micelares atraves dos tempos de relaxação de 13C de ressonacia magnetica nuclear
Carbon-13 spin-lattice relaxation times were used to characterize the behavior of ionic solutes in isotropic micellar solutions. Threee monosubstituted benzene were analyzed, benzenesulfonate, benzoate and anilinium ions, in micellar solutions prepared using the surfactants alkyltrimetylammonium bromide (C10, C14 and C16), decylammonium chloride, potassium d
Publicado em: 1990
-
21. Efeito de detergentes na velocidade de: transferência intramolecular de acila-tiolise de acetato de p-nitrofenila / Effect of detergents on the rate of: Intramolecular acyl-transfer. Thiolysis of p-noitrophenylacetate
Two systems were used in order to investigate some of the factors that modify the reaction rate in micelles. The rate of S to N acyl transfer of S-octanoyl-β- mercaptoethylamine (OMA) is enhanced by hexadecyl trimethylammonium bromide (CTAB) micelles by 4.6 fold and slightly inhibited by the non ionic detergent Brij-35. The rate of S to N transfer of S-
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/07/1977
-
22. Photosensitized electron transfer processes in SiO2 colloids and sodium lauryl sulfate micellar systems: Correlation of quantum yields with interfacial surface potentials
The effectiveness of negatively charged colloidal SiO2 particles in controlling photosensitized electron transfer reactions has been studied and compared with that of the negatively charged sodium lauryl sulfate (NaLauSO4) micellar system. In particular, the photosensitized reduction of the zwitterionic electron acceptor propylviologen sulfonate (PVS0) with
-
23. Energetics of intermediates in membrane fusion: comparison of stalk and inverted micellar intermediate mechanisms.
To understand the mechanism of membrane fusion, we have to infer the sequence of structural transformations that occurs during the process. Here, it is shown how one can estimate the lipid composition-dependent free energies of intermediate structures of different geometries. One can then infer which fusion mechanism is the best explanation of observed behav
-
24. The effects of ethylene oxide containing lipopolymers and tri-block copolymers on lipid bilayers of dipalmitoylphosphatidylcholine.
A comparative study is conducted on the influence of two types of polymeric compounds on the phase behavior of 1,2-dihexadecanoyl-s,n-glycero-3-phosphotidylcholine (DC16PC) lipid bilayers. The first polymeric compound is a lipopolymer, with two different lengths of a hydrophilic polyethylene oxide moity, anchored to the bilayer by a 1,2-dioctadecanoyl-s,n-gl