Portions of the emulsions were adjusted to pH 7.0 or 3.0 with 2 M HCl with stirring at 250 rpm for 30 min. The citralloaded emulsions stabilized by SPP or SPI contained 10% citral (w/w) with the ratio of citral to SPP or SPI at 3:1 only. Triplicates were prepared for each emulsion.