Two cationic gemini surfactants with pyrrolidinium or alkyl ammonium head groups with but-2-yne spacers, but with the same length hydrocarbon chain have been characterized with respect to their aggregation behaviors and separation power as pseudostationary phases (PSPs) for micellar electrokinetic chromatography (MEKC). They were compared with a commonly used PSP, sodium dodecylsulfate (SDS). T...

A micelle-to-vesicle transition (MVT) induced by the addition of a series of apolar hydrocarbons (n-butylbenzene, n-hexane, n-octane, and n-dodecane) to the catanionic surfactant system n-dodecyltriethylammonium bromide/sodium n-dodecylsulfate (DTEAB/SDS) has been investigated for the first time by means of rheology and turbidity measurements, dynamic light scattering (DLS), and transmission el...

A high-performance liquid chromatographic (HPLC) method and a cyclodextrin-modified micellar electrokinetic chromatographic (CD-MEKC) method were developed to separate and determine oleanolic acid (OA) and ursolic acid (UA) in Prunella vulgaris. HPLC separations were carried out on a Hedera ODS C18 column with methanol -H2Oacetic acid (85:15:0.3, v/v/v) as mobile phase at a flow-rate of 0.8 ml ...

2014 Complex particles are formed in water by the spontaneous association of poly(ethylene oxide) macromolecules (PEO) with the small amphiphilic molecules of sodium dodecylsulfate (SDS). As a result, the phase diagram of dilute PEO + SDS solutions shows 2 singularities : a critical SDS concentration for the formation of the aggregates, and a stoichiometry. Small angle neutron scattering experi...

The influence of the water soluble non-ionic tri-block copolymer PEO-PPO-PEO [poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)] i.e., E2P16E2 (L31) on the microstructure and self-aggregation dynamics of the anionic surfactant sodium dodecylsulfate (SDS) in aqueous solution was investigated using cloud point (CP), isothermal titration calorimetry (ITC), high resolution nuclear mag...

Poly((2edimethylamino)ethyl methacrylate) with 60,000 g/mol and a narrow polydispersity (1.12) was synthesized using group transfer polymerization in order to investigate the structure of poly ((2edimethylamino)ethyl methacrylate)/sodium dodecylsufate complexes in water. The synthesized polymer chain conformation in water was studied as a function of deuterated sodium dodecylsulfate concentrati...

The adsorption of two zwitterionic surfactants, dodecyldimethylammonium propanesulfonate (C12PS) and carboxybetaine (C12CB), their mixtures with the cationic dodecyltrimethylammonium bromide (C12TAB) anionic sodium dodecylsulfate (SDS) at silica–water interface has been studied by neutron reflection (NR). total adsorption, composition adsorbed layer, some structural information have obtained ov...

There are only a few available methods to study lateral interactions and self assembly of transmembrane helices. One of the most frequently used methods is sodium dodecylsulfate polyacrylamide gel electrophoresis (SDS-PAGE) which can report on strong interactions between peptides in SDS solution. Here we offer a cautionary tale about studying the folding and assembly of membrane proteins using ...

The system comprised of poly(dimethyldially1ammonium chloride) (PDMDAAC) and oppositely charged mixed micelles of Triton X-100 (TXlOO) and sodium dodecylsulfate (SDS) displays several states, including coacervate and various soluble complexes. The phase boundary for the equilibrium between soluble complexes and coacervate (“associative phase separation” according to Piculell and Lindman) for 0....