Small-Angle Neutron Scattering Study of High Fat Fish Oil-In-Water Emulsion Stabilized with Sodium Caseinate and Phosphatidylcholine

Betül Yesiltas*, Mika Torkkeli, László Almásy, Zoltán Dudás, Pedro Jesús García Moreno, Ann-Dorit Moltke Sørensen, Charlotte Jacobsen, Matti Knaapila

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We report on small-angle neutron scattering (SANS) investigations of separate phase domains in high fat (70%) oil-in-water emulsions emulsified with the combination of sodium caseinate (CAS) and phosphatidylcholine (PC). The emulsion as a whole was studied by contrast variation to identify scattering components dominated by individual emulsifiers. The emulsion was subsequently separated into the aqueous phase and the oil-rich droplet phase, which were characterized separately. Emulsions produced with 1.05% (w/w) CAS and PC fraction which varies between 1.75% (w/w) and 0.35% (w/w) provided droplets between 10 and 19 μm in surface weighted mean in 70% fish oil-in-water emulsions. At least two-third of the overall CAS is associated with the interface, while the rest remains with the aqueous phase. Six percent of PC formed a monolayer in the interface, while the rest of the PC remains in the droplet phase in the form of multilayers. When the separated components were resuspended, the resuspended emulsion showed similar characteristics compared to the original emulsion in terms of droplet size distribution and neutron scattering. Instead, CAS in the aqueous phase separated from the emulsion shows aggregation not present in the corresponding CAS-in-D2O system.
Original languageEnglish
JournalLangmuir
Volume36
Issue number9
Pages (from-to)2300-2306
ISSN0743-7463
DOIs
Publication statusPublished - 2020

Keywords

  • Emulsions
  • Interfaces
  • Lipids scattering

Cite this