Background: Aquatic ecosystems are an important source of nontuberculous mycobacteria (NTM) that can cause different diseases in human. Since culture of mycobacteria needs long-term incubation, fast-growing microorganisms and contaminants in the environment usually prevents the isolation of mycobacteria. Here, we compare different treatment protocols and describe a method that increases the rec...

many properties of chemicals depend on their streochemistry. among these, the effects of streoisomerism on percutaneous absorption of drugs, which is subject of the present investigation, is not well studied yet. in this study, tretinoin (tt) and isotretinoin (itt) (geometric isomers) were chosen and their permeations (alone or in the presence of each other) through enhancer-treated excised rat...

Carbonaceous covalent triazine-based frameworks from 1,4-dicyanobenzene (CTF-1) can adsorb up to about 4 g g(-1) of the surfactants alkyl polyglycolether, C12EO7 and sodium dodecylsulfate, SDS from aqueous solution (c = 8.0 mmol L(-1)) which is more than 20-times the gravimetric uptake capacity of a carbon black (Printex L from Evonik). This high uptake is due to CTF sheet exfoliation. Taking i...

A fluorescence probe study on micellization of the binary surfactant system formed by n-octyl-d-thioglucopyranoside (OTG) and sodium dodecyl sulphate (SDS) in 0.1 M NaCl aqueous solutions has been carried out. The CMC experimental data, as obtained by the pyrene 1:3 ratio method, have been analyzed in the context of the pseudophase separation model. The interaction parameter (β12) determined by...

In recent years, the ability of ionic surfactants such as sodium dodecyl sulfate (SDS) to solubilize the water-insoluble protein Zein in aqueous solution, referred to as the Zein solubilization test, has been investigated to rank the skin irritation potential and protein denaturation potential of surfactants. However, the potential of cationic surfactants towards solubilization of Zein has not ...

We present a methodology to quantitatively determine the fraction of sodium dodecyl sulfate (SDS) that partitions to the oil/water interface in oil-in-water macroemulsions and calculate the total interfacial area (TIA) through the novel use of filtration through nanoporous membranes. Ultrafiltration was carried out in centrifuge tubes having nanoporous filters with a 30,000 molecular weight cut...

Aqueous two-phase (ATP) systems are useful in the separation of, particularly, biomolecules. These form when an aqueous solution’s concentrations of phase-forming compounds (such as polymers like polyethylene glycol and salts) within envelope. Various physical chemical conditions affect ATP phase formation, such temperature, pH, composition. One set chemicals which has not been characterized te...

Surfactant molecules are used as interesting tools to study the structure, function and stability of proteins. Protonation states of amino acids may be changed in the presence of surfactants. In this work, using experimental observations and molecular dynamic simulation, the effects of sodium dodecyl sulfate on the acid dissociation constants of tryptophan was examined. The acid–base equilibriu...

Measurements of the surface tension, density and viscosity of sodium dodecyl sulfate (SDS) and rhamnolipid (RL) mixtures were carried out in aqueous solution. From the obtained results, composition of mixed surface layer at the water-air interface, mixed micelles, parameter of intermolecular interactions, activity of SDS and RL in the surface layer and micelles, Gibbs standard free energy of ad...