Interactions in mixed cationic surfactants and dextran sulfate aqueous solutions

Dextran sulfate/Triton X two-phase micellar systems as an alternative first purification step for clavulanic acid

“…The polymer can also interact with the surfactants resulting in intermolecular complexes [27]. The multistep mechanisms of interaction include successive electrostatic, hydrophobic, and intra-and inter-polyelectrolyte interactions, resulting in a formation of variety of single and coexisting phases, from differently ordered polyelectrolyte-surfactant monomer complexes to the stoichiometric precipitate and gel phase [29]. At low surfactant concentrations, well below the CMC, the electrostatic binding of surfactant on the polyelectrolyte chain is the prevailing process, which leads to formation of polyelectrolyte-surfactant complexes.…”

The bone morphogenetic protein pathway is active in human colon adenomas and inactivated in colorectal cancer

“…Over the past decade, there has been an increasing interest in the creation of vesicles and it has been found that except from double‐chained compounds, including natural amphiphiles (mainly phospholipids) and synthetic surfactants,1–3 vesicles can also form from single‐chained surfactants under specific conditions 4–10. Recently, it was thought that mixture of polyelectrolyte and oppositely charged surfactant could be a new kind of vesicle‐forming candidate system 11–17. The structure of a polyelectrolyte‐surfactant complex was often regarded as micelle‐like, and the “necklace” model18 was proposed and widely accepted.…”

“…In 1998, Kabanov et al13 prepared vesicles by simply mixing block copolymers containing ionic and nonionic water‐soluble segments with oppositely charged single‐tailed surfactants. In the recent years, more reports14–17 have revealed that vesicles can spontaneously form in polyelectrolyte‐surfactant systems. Unfortunately, so far the mechanism of the vesicle formation and the relationship among the interaction of the components, the microstructure, and the properties of the aggregates in this kind of mixed system are still unclear due to the complexity of the polymer structure.…”

Vesicle formation with amphiphilic chitosan derivatives and a conventional cationic surfactant in mixed systems

“…Polymer-surfactant mixtures may assemble into different nanostructures, which can be designed by simply changing the composition of the species in the system [9][10][11]. As a result of the capability to form new nanostructures, numerous research groups have devoted their attention to advancing the fundamental understanding of the physics governing these interactions [12,13].…”