Micellar electrokinetic chromatography separates neutral molecules and ions. We illustrate
a case in which the anionic surfactant sodium dodecyl sulfate is present above its critical
micelle concentration (Box 26-1), so negatively charged micelles are formed.36 In Figure 26-32,
electroosmotic flow is to the right. Electrophoretic migration of the negatively charged
micelles is to the left, but net motion is to the right because the electroosmotic flow dominates.