Impact of NaCl substitution with KCl on lipid oxidation and antioxidant distribution in O/W emulsions

This study aims to investigate antioxidant distribution in O/W emulsions as affected by salt substitution. Since our previous studies found that salt substitution could influence the formation of emulsifier micelles, Tween 20 was chosen for this study. In Tween 20-stabilized emulsions with salts, the Pearson correlation coefficients between lauryl gallate in the aqueous phase and lipid oxidation parameters were higher than its total concentration, while propyl gallate showed the opposite trend. Without salts, the Pearson correlation coefficients between the total antioxidant concentration and lipid oxidation parameters were higher than the aqueous antioxidant concentration. The lag phase of emulsions with salts ended when antioxidants in the aqueous phase dropped to 50%, suggesting their concentration as an indicator of oxidative stability.