UHPH-processed O/W submicron emulsions stabilised with a lipid-based surfactant: Physicochemical characteristics and behaviour on in vitro TC7-cell monolayers and ex vivo pig's ear skin - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Colloids and Surfaces B: Biointerfaces Année : 2014

UHPH-processed O/W submicron emulsions stabilised with a lipid-based surfactant: Physicochemical characteristics and behaviour on in vitro TC7-cell monolayers and ex vivo pig's ear skin

Résumé

Submicron O/W emulsions formulated with sesame oil plus a lipid-base surfactant, and with or without retinyl acetate (RAC) as a model hydrophobic biomolecule, were prepared by single-pass homogenisation at ≥ 200 MPa (UHPH) and an initial fluid temperature (Tin) of 24°C. These emulsions were characterised by a monomodal distribution (peak maximum at 260 nm) and a 2-year potential physical stability at ambient temperature. Submicron droplets were investigated in term of (i) physicochemical characteristics (size distribution curves; ζ-potential value), and (ii) impact on TC7-cell monolayers (MTT-assay and cell LDH-leakage). Submicron droplets ± RAC did not affect or increased significantly (p=0.05) TC7-cell metabolic activity after 4-24h of exposure indicating absence of cellular impairment, except when high amounts of droplets were deposed on TC7-cells. Indeed, the lipid-based surfactant deposed alone on TC7-cells at high concentration, induced some significant (p=0.05) cell LDH-leakage, and therefore cell-membrane damage. Cellular uptake experiments revealed a significant (p=0.05) time-dependent internalisation of RAC from submicron droplets, and cellular transformation of RAC into retinol. The turnover of RAC into retinol and therefore RAC bioaccessibility appeared faster for RAC-micelles of similar size-range and prepared at atmospheric pressure with polysorbate 80, than for submicron O/W emulsions. Permeation experiments using pig's ear skin mounted on Franz-type diffusion cells, revealed RAC in dermis-epidermis, in significantly (p=0.05) higher amounts for submicron than coarse pre-emulsions. However, RAC amounts remained low for both emulsion-types and RAC was not detected in the receptor medium of Franz-type diffusion cells.
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Dates et versions

hal-03585511 , version 1 (23-02-2022)

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Amal Benzaria, Alvar Gràcia-Julià, Laëtitia Picart-Palmade, Pauline Hue, Dominique Chevalier-Lucia, et al.. UHPH-processed O/W submicron emulsions stabilised with a lipid-based surfactant: Physicochemical characteristics and behaviour on in vitro TC7-cell monolayers and ex vivo pig's ear skin. Colloids and Surfaces B: Biointerfaces, 2014, 116, pp.237-246. ⟨10.1016/j.colsurfb.2013.12.050⟩. ⟨hal-03585511⟩
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