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A self-nanoemulsifying drug delivery system (SNEDDS) has been developed for enhanced oral bioavailability of lutein. Its permeation enhancement has been evaluated using monolayers of Caco-2 cells. SNEDDS is composed of a mixture of Lexol® and Emulmetik® 900, Labrasol®, and Tween 80 as oil, surfactant and co-surfactant, respectively. Upon dilution of lutein-loaded SNEDDS with water, a nanoemulsion was obtained in <10 s with spherical droplets of 40-150 nm in diameter. The zeta potential was in the range of -19 to -32 mV. Increasing the ratio of surfactant to co-surfactant decreased the mean droplet size. Dissolution studies showed that lutein was released rapidly (<5 min) from SNEDDS into 0.1 N HCl and pH 6.8 phosphate buffer solution without any aggregation. In vitro studies using Caco-2 cells revealed that lutein-loaded SNEDDS showed shorter lag time and greater (2-fold) cellular accumulation compared with the lutein dispersion.

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