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Zeta potentials and effective diameters of the emulsions were studied using a ZetaPlus instrument (Brookhaven Co.). The emulsions were prepared by dissolving 0.1 ml of n-tetradecane in n-propanol and then deionized water or lysozyme solution was added to obtain the emulsion. The effective diameters and zeta potentials were determined after 5, 15, 30, 60, 120 min, and 1 and 2 days after preparation...