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Potentiometric titration curves were obtained for aqueous solutions of native whey protein isolate (WPI) and β-lactoglobulin (β-lg) at different NaCl concentrations. The curves crossed at approximately the same pH, which is considered to be the isoionic point (IIP). Titration with NaCl confirmed that the pH was independent of the salt concentration up to 0.1 M at the IIP, which was 4.9 for WPI and...
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