The interaction between dairy proteins [micellar casein (MC) vs. whey protein isolate (WPI)] and phospholipids [PL; soy phosphatidylcholine (PC) vs. milk sphingomyelin (SM)] in an oil-in-water emulsion system was investigated. Sole PC-stabilized emulsion (1%, wt/ vol) showed a significantly larger mean particle diameter (6.5 μm) than SM-stabilized emulsions (3.8 μm). The mean particle diameters of emulsions prepared by the combination of protein (1%, wt/vol) and PL (1%, wt/vol) did not significantly differ from the emulsions prepared with a single emulsifier (MC, WPI, and SM). Emulsion instability differed significantly among samples by a centrifugation-mediated accelerated stability test.
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