Interfacial and colloidal characterization of oil-in-water emulsions stabilized by interface-tunable solid lipid nanoparticles. (15th February 2020)

• Record Type: Journal Article
• Authors: Lim, Honggu; Jo, Myeongsu; Ban, Choongjin; Choi, Young Jin
• Is Part Of: Food chemistry. Volume 306(2020)
• Publication Date: 2020-02-15
• Subjects: Colloidal stability -- Contact angle -- Interfacial characteristics -- Pickering emulsion -- Solid lipid nanoparticle -- Surface load; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2019.125619
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: Increasing emulsifier concentration increased the surface load ( Γ s ) on SLN. Increasing Γ s decreased the contact angle ( θ ) of SLNs at the oil–water interface. Decreasing θ enhanced the displacement free energy ( Δ G d ) of SLNs at the interface. The more emulsifiers used to prepare SLNs, the more stable SLN-stabilized emulsions. Abstract: We evaluated the correlation between the interfacial characteristics of solid lipid nanoparticles (SLNs) and the interfacial/colloidal stability of SLN-stabilized emulsions. Herein, the interfacial properties of SLNs, particularly the surface load ( Γ s ) of emulsifiers, were tuned by controlling the type/concentration of emulsifier used to prepare the SLNs. Increasing the Γ s decreased the contact angle at the oil–water interface, which enhanced the displacement free energy of the SLNs at the interface. Moreover, the Γ s of emulsifiers bound to the surface of SLNs covering oil droplets was linearly correlated with the SLN-own Γ s . The size/ζ-potential of emulsions stabilized by SLNs covered by the highest concentration of emulsifiers was unchanged for 1 month, indicating good emulsion stability. The interfacial/colloidal stability of SLN-stabilized emulsions was thus enhanced by increasing the emulsifier concentration used to produce the SLNs. This study provides baseline data for developing SLN-stabilized emulsions for the food, cosmetic, and pharmaceutical industries.