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Stabilization of vitamin C in emulsions of liquid crystalline structures

Abstract : Emulsified systems are widely used for topical delivery with the aim of optimizing cutaneous absorption and offering a pleasant sensory. They also may provide a protection of the active molecule against oxidation and/or degradation. The oil phase of o/w emulsions may consist of liquid crystalline structures, especially lamellar structures which are similar to those found in the stratum corneum lipids. In the present work, o/w emulsions containing liquid crystals of mixed cetyl alcohol and Polysorbate 60 were developed for topical delivery of vitamin C, a potent antioxidant with several applications in the cosmetic and pharmaceutical fields. In addition to the well-documented lipid supplementation of the stratum corneum, the liquid crystal emulsions provide a significant chemical stabilization of vitamin C against its degradation. Emulsions were characterized by X-ray diffraction, polarized optical 2 microscopy, and transmission electron microscopy. The stability of vitamin C in the formulations was evaluated upon storage in different conditions of temperature. The emulsions contain a complex colloidal structure, consisting of lamellar liquid crystalline (Lα) and crystalline lamellar gel (Lβ) phases, that provide a very efficient protection of vitamin C against its degradation.
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https://hal.archives-ouvertes.fr/hal-03085908
Contributor : Yves Chevalier <>
Submitted on : Tuesday, December 22, 2020 - 10:16:08 AM
Last modification on : Thursday, January 7, 2021 - 1:58:37 PM

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Amanda Caritá, Jacqueline Resende de Azevedo, Marcus Vinícius Buri, Marie-Alexandrine Bolzinger, Yves Chevalier, et al.. Stabilization of vitamin C in emulsions of liquid crystalline structures. International Journal of Pharmaceutics, Elsevier, 2021, 592, pp.120092. ⟨10.1016/j.ijpharm.2020.120092⟩. ⟨hal-03085908⟩

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