Issue 21, 2021

A hierarchical emulsion system stabilized by soyasaponin emulsion droplets

Abstract

Oil/water (O/W) emulsion droplets coated with soyasaponin (Ssa) were used as emulsifiers to prepare emulsions with hierarchical configurations (2.82 μm). Ssa is a natural triterpenoid with amphiphilic properties and an excellent emulsifying activity. Stable O/W emulsions were prepared and characterized using an ultrasonic method at a Ssa concentration of 2.5 wt%. The resultant hierarchical emulsions were further prepared using O/W droplets as emulsifiers. It was observed that the stability of the hierarchical emulsions changed with alterations to the ratio of O/W droplets to the oil phase. As the number of droplets increased, the more the surface area of the hierarchical emulsion was covered. Additional observations included a decreased particle size, increased negative charge and viscoelastic behavior, and enhanced emulsion stability. The emulsion was most stable when the O/W droplet addition was 29%. The addition of O/W droplets continued to increase, and there was an imbalance in the ratio of O/W droplets to the oil phase; the excess O/W droplets induced instability in the emulsion, resulting in a degradation of the emulsion quality. We monitored hierarchical emulsions with different concentrations of emulsifiers for 30 days, and the results indicated that hierarchical emulsions could meet the demand for long-term storage. This provides a new theoretical basis for the construction and application of complex emulsion systems.

Graphical abstract: A hierarchical emulsion system stabilized by soyasaponin emulsion droplets

Supplementary files

Article information

Article type
Paper
Submitted
24 May 2021
Accepted
27 Aug 2021
First published
28 Aug 2021

Food Funct., 2021,12, 10571-10580

A hierarchical emulsion system stabilized by soyasaponin emulsion droplets

G. Zhao, L. Zhu, H. Li, X. Liu, L. Yang, S. Wang, H. Liu and T. Ma, Food Funct., 2021, 12, 10571 DOI: 10.1039/D1FO01607E

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