Antioxidant Loaded Emulsions Entrapped in Liposomes Produced using a Supercritical Assisted Technique

Abstract Two different strategies for the encapsulation of hydrophobic bioactives within nanoliposomes were attempted. Three model lipophilic antioxidants (farnesol, limonene, linalool) were entrapped in liposomes using emulsions: drug was dissolved in the oil phase of an oil in water emulsion; then, the aqueous emulsion was entrapped in liposomes inner core using SuperLip (Supercritical assisted Liposome formation). Vesicles loaded with antioxidants in the lipidic layer, showed mean sizes from 116 ± 32 nm to 230 ± 62 nm, with an Encapsulation Efficiency (EE) up to 74 % for farnesol, 87 % for limonene and 54 % for linalool. The use of O/W emulsion, resulted in larger liposomes (among 397 ± 103 nm and 605 ± 175 nm), but also in an EE up to 99 %. O/W emulsion method successfully preserved the antioxidant activity of the entrapped molecules. The reduction of the antioxidant power was about 22 % for lipidic layer entrapment; whereas, only 2 % using O/W method.