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- W2026746722 abstract "Abstract Counterion (Na+) binding to anionic surfactant (monoalkylphosphate) micelles was monitored by 23Na nuclear magnetic resonance spectroscopy using spin-lattice (T1) and spin-spin (T2) relaxation times. The T1 and T2 values were almost identical at all surfactant concentrations within experimental error. At concentrations below the critical micelle concentration (CMC), T1 and T2 showed almost a constant value. A sudden decrease in relaxation times (increase in relaxation rates) occurred at the CMC, as expected. Above the CMC, the relaxation times decreased with the increase in surfactant concentrations. Double reciprocal plots between relaxation times and surfactant concentrations produced rectilinear curves. Extrapolation of the linear portions intersected each other at the CMC. When the surfactant concentration was below the CMC, inhalation anesthetics (chloroform, enflurane, and halothane) did not affect the apparent T2 value even with saturating concentrations. When the surfactant concentration exceeded the CMC, these inhalation anesthetics decreased apparent T2 value dose-dependently, indicating stronger binding of sodium ions. The anesthetics appear to be solubilized at the micelle-water interface and increase hydrophobicity of the interface by replacing water molecules. A decrease in the local dielectric constant by anesthetic molecules may account for the increase in the counterion binding to the micellar surface." @default.
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- W2026746722 date "1986-02-01" @default.
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- W2026746722 title "Counterion binding to micelles measured by sodium-23 NMR relaxation times: Enhancement by anesthetics" @default.
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- W2026746722 doi "https://doi.org/10.1016/0021-9797(86)90312-7" @default.
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