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Droplet ¯occulation caused a signi®cant increase inthe creaming rate of the droplets in the emulsions (Fig.4). In the absence of CaCl2 the emulsions were relativelystable to creaming at low and high pH, but were highlyunstable around the isoelectric point of the proteins.The addition of CaCl2 had a signi®cant impact on thepH dependence of the creaming stability of the emulsions. At pH values signi®cantly below the isoelectricpoint of the proteins (pH < 4.5) all of the emulsionswere relatively stable to creaming. At pH values abovethe isoelectric point the emulsions were relatively stableto creaming below a certain CaCl2 concentration, butbecame unstable when this concentration was exceeded.This critical CaCl2 concentration increased as the pHmoved further away from the isoelectric point. Aboveabout 5 mM CaCl2 all of the emulsions were unstable tocreaming above the isoelectric point.
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