Effect of the emulsifier type on the physicochemical stability and in vitro digestibility of a lutein/zeaxanthin-enriched emulsion

다국어 초록 (Multilingual Abstract)

Lutein (L) and zeaxanthin (Z), as macular pigments,are water-insoluble, chemically unstable, and havelow bioaccessibilities; they are often emulsified to overcomethese limitations. This study investigated the impactof various emulsifiers (ethyl lauroyl arginate (LAE);Tween 80; and sodium dodecyl sulfate (SDS)) on thephysicochemical properties and in vitro digestibilities ofL/Z-fortified oil-in-water emulsions. Droplet aggregationand creaming extents were dependent on the emulsifiertype. The f-potentials of emulsions stabilized by LAE,Tween 80, and SDS were ? 87, - 26, and - 95 mV,respectively. SDS-stabilized emulsion had the smallestparticles, while the particle sizes for the LAE- and Tween80-stabilized emulsions were larger and not significantlydifferent. The rates of L/Z degradation were sensitive to theemulsifier type and to heat, not to light. The L/Z bioaccessibilitywas the highest for the Tween 80 emulsion.
Surfactants should therefore be carefully selected to optimizeL/Z physicochemical stability and bioaccessibility inemulsions.

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