Prooxidative properties of aldehydes in oil-in-water emulsion on the aspects of physicochemical properties

초록

Effects of aldehydes on the oxidative stability and physicochemical properties including oxygen solubility, surface tension, interfacial tension, and droplet sizes were evaluated in an oil-in-water (O/W) emulsion matrix. As amphiphilic aldehydes including propanal, hexanal, and nonanal added in O/W emulsion, headspace oxygen depletion and formation of conjugated diene and lipid hydroperoxides increased significantly (p < 0.05) compared to O/W emulsion without the addition of aldehydes, which implies added aldehydes acted as pro-oxidants in O/W emulsion. Oxygen solubility was increased in nonanal added O/W emulsion whereas surface tension and interfacial tension decreased significantly in nonanal added groups (p < 0.05), which implies that added aldehydes induced the internal environmental changes of the O/W emulsion. No significant differences were observed in droplet size and zeta potential, irrespective of the addition of aldehyde. Amphiphilic aldehydes could partly play prooxidative roles in O/W emulsion due to the increasing oxygen solubility and decreasing surface and interfacial tension.

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