Kinetics of transport of benzoic acid in emulsions

The rate of interphase transport of benzoic acid in sunflower oil-in-water emulsions containing SDS, Tween-80 and whey protein as surfactants was measured by a continuous flow kinetic technique. The approach allowed concentration-time data, on a millisecond timescale, to be obtained. These confirmed that the transport occurs on this timescale but the apparent size of the oil droplets was substantially greater than their actual size, interpreted as a thick diffusion layer of aqueous solvent surrounding each droplet.