Polystyrene-block-polyferrocenylsilane (PS-b-PFS) diblock copolymers were stoichiometrically oxidized in solution using salts of the one-electron oxidant tris(4-bromophenyl)ammoniumyl. Due to a redox-induced polarity change for the PFS block, self-assembly into well-defined spherical micelles occurs. The micelles are composed of a core of partially oxidized PFS segments and a corona of PS. When...

Measurements of the surface tensions, densities and viscosities of aqueous solutions of Triton X-100 (TX-100) and rhamnolipid (RL) mixtures, at constant concentration of RL or TX-100, were carried out. The measured values of the surface tension were compared to those determined using different theoretical models and on the basis of the surface tension of aqueous solutions of individual surfacta...

The extent and locus of solubilization of guest and self-assembling surfactant host molecules in aqueous solutions are influenced by a variety of hydrophobic and hydrophilic interactions, as well as by more specific interactions between the various species present. By using a combination of two-dimensional heteronuclear 13C[1H] NMR correlation experiments with pulsed-gradient NMR diffusion and ...

The aggregation behavior of the antibiotic moenomycin A (MoA) in aqueous solution under the influence of pH and ionic strength has been investigated using the fluorescent probe pyrene. Changes of the cmc between 0.03 and 0.7 mM correlate with the effective charge of MoA originating from three ionizable groups, the pKa of which have been determined by infrared spectroscopy. The dependence of the...

Ethanol (95%) and dichloromethane : methanol (1 : 1) bark extracts of authenticated Ceylon cinnamon were investigated for range of antilipidemic activities (ALA): HMG-CoA reductase, lipase, cholesterol esterase, and cholesterol micellization inhibitory activities and bile acids binding in vitro. Individual compounds in bark extracts were also evaluated. Bark extracts showed ALA in all the assay...

Surfactant solutions typically feature tunable nanoscale, internal structures. Although rarely utilized, they can be a powerful platform for probing thermal transport in nanoscale domains and across interfaces with nanometer-size radius. Here, we examine the structure and thermal transport in solution of AOT (Dioctyl sodium sulfosuccinate) in n-octane liquids using small-angle neutron scatterin...

The enthalpies of dilution of solutions of two bile salts in water and aqueous NaCI were measured over a range of solute concentrations encornpassing the critical micellization concentrations (c.m.c.). The compounds were sodium taurodeoxycholate and sodium tauro choiate. An isoperibolic reaction calorimeter was used. The observed changes of enthalpies of dilution as a function of surfactant and...

Bioavailability is a critical feature in the assessment of the role of micronutrients in human health, and the approaches to this issue include in vitro and in vivo methods. Foodand host-related factors affect the bioavailability of carotenoids and tocopherols, and major challenges in the study of bioavailability include the release of these compounds from the food matrix, micellization, the me...