Figure 3.

Determination of the Fos-10 critical micelle concentration (c.m.c.) in NMR samples using NMR diffusion measurements. Apparent translational diffusion coefficients, $D_t^{\mathit{\text{app}}}$, determined by observation of Fos-10 ¹H-NMR signals, are plotted versus the inverse of the detergent concentration, 1/[Fos-10] (see text). The filled triangles represent experimental measurements. The horizontal line indicates $D_t^{\mathit{\text{app}}}$ for samples with [Fos-10] < 5 mM, i.e., at concentrations clearly below the c.m.c., and the line on the left represents a fit of Eq. (4) to the data points measured for [Fos-10] > 30 mM, i.e., at concentrations of twice the c.m.c. and above. The intersection of the two lines representing the two limiting regimes (arrow) represents the effective Fos-10 c.m.c. in the NMR sample.