Following pretreatment (increase of pH to 10, homogenization at 24,000 rpm and readjusted of pH to
6.5) of the dispersions, if necessary, oil in water emulsions were prepared by adding dropwise, while mixing, 5 ml of corn oil into 45 ml of SCP dispersions (oil volume fraction=0.1), with the aid of a propeller-type mechanical stirrer.