A New Method for the Determination of Critical Micelle Concentrations of Un-ionized Associations Colloids in Aqueous or in Non-aqueous Solution

Availability of Drugs in the Presence of Surface-Active Agents I: Critical Micelle Concentrations of Some Oxyethylene Oxypropylene Polymers

“…Iodine Method.-A method developed by Ross and Olivier (18), based on the color change of iodine t h a t takes place when nonionic rnicelles arc present As the author pointed out, examination of the total absorption spectrum shows that a change in the spectrum is too small to be suitable for a measure of CMC. However, if the spectrum of the solution of surface-active agent is examined a t 530 mp, using the aqueous dye solution as the reference liquid instead of water, this differential absorption spectrum shows pronounced differences as a function of the concentration of the surfactant.…”

Exploration of the Drosophila Acetylcholinesterase Substrate Activation Site Using a Reversible Inhibitor (Triton X-100) and Mutated Enzymes

“…The critical micellar concentration (CMC) of Triton X-100 was determined in 25 mM phosphate buffer at pH 7 and 25°C, using the method described by Ross and Olivier (22). Briefly, the Triton X-100 was mixed at various concentrations with a 30 mg⅐liter Ϫ1 iodide solution.…”

Micropolarity of Reversed Micelles: Comparison between Anionic, Cationic, and Nonionic Reversed Micelles

“…The absence of acidic impurity was checked by using QB as an indicator (5). to form reversed micelles and water-in-oil microemulsions in several organic solvents (11)(12)(13)(14)(15)(16)(17). The behavior of QB was Benzene, hexane ( n-hexane), cyclohexane (Sintorgan, HPLC), heptane (n-heptane, Merck, HPLC), and decane studied for Brij 30 (commercial analog of C 12 E 4 ) in benzene since it is one of the few nonionic surfactants that has been (99% from Sigma) were dried by distillation over metallic sodium before use.…”

“…The behavior of QB was Benzene, hexane ( n-hexane), cyclohexane (Sintorgan, HPLC), heptane (n-heptane, Merck, HPLC), and decane studied for Brij 30 (commercial analog of C 12 E 4 ) in benzene since it is one of the few nonionic surfactants that has been (99% from Sigma) were dried by distillation over metallic sodium before use. reported to form reverse micelles in such organic solvent (11). Unfortunately, this system is only stable when W is Water was first distilled over potassium permanganate and then bidistilled until a conductivity of 0.3-0.5 mV 01 cm 01 practically zero (12).…”