Solute transport resistance at water-oil interfaces

The barriers to transport of methyl nicotinate across the water-octanol, water-2,2,4-trimethylpentane, and water-isopropyl myristate interfaces at 25 degrees C have been studied using a rotating diffusion cell. Comparison of results for systems which comprise zero, one, and two interfacial barriers shows that, contrary to previous reports, interfacial resistance is not a significant barrier in these cases and is below the limit of detection of the rotating diffusion cell method.