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The pH dependence of the mean particle size of protein stabilized emulsions determined by turbidity measurements is shown in Fig. 3. These measurements werecarried out 24 h after the CaCl2 was added to theemulsions and they had been stored at 30C. In theabsence of calcium chloride there was a signi®cantincrease in mean particle size around the isoelectricpoint (4 < pH < 6) of the whey proteins, which suggested that appreciable droplet aggregation occurred.The addition of CaCl2 to the emulsions signi®cantlyaltered the extent of droplet aggregation. When theCaCl2 concentration was increased from 0 to 1 mM thepH at which the droplets aggregated shifted to highervalues (Fig. 3). This is because the isoelectric point ofthe emulsion droplets shifted to higher pH (Fig. 1),presumably because of binding of Ca2+ ions at very lowcalcium chloride concentrations. As the CaCl2 concentration was increased above 1mM the range of pHvalues above the isoelectric point over which the emulsions became unstable grew wider. At 20 mM CaCl2 the
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