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Stabilization of liquid water-in-oil emulsions by modifying the interfacial interaction of glycerol monooleate with aqueous phase ingredients
  • Maria Romero-Peña,
  • Supratim Ghosh
Maria Romero-Peña
University of Saskatchewan

Corresponding Author:mfr513@mail.usask.ca

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Supratim Ghosh
University of Saskatchewan
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Glycerol monooleate (GMO)-stabilized liquid water-in-vegetable oil (W/VO) emulsions are difficult to stabilize due to the desorption of GMO from the W-VO interface towards the oil phase. This work improved the stability of GMO-stabilized liquid 20 wt% water-in-canola oil (W/CO) emulsion by modifying the dispersed aqueous phase composition with hydrogen bond-forming agents. As a control, 20 wt% water-in-mineral oil (W/MO) emulsion was also utilized. Different concentrations of hydrogen bond-forming agents (citric acid (CA), ascorbic acid (AA), low methoxyl pectin (LMP)) with and without salts (sodium chloride (S) or calcium chloride (Ca)) was added to the aqueous phase before emulsification, which enhanced emulsifier binding to the water-oil interface. The emulsions were characterized by phase separation, stability against accelerated gravitation, microstructure and rheology. W/CO emulsion without any aqueous phase additive destabilized instantly, whereas W/MO emulsion stayed stable. The addition of hydrogen bond-forming agents and salts significantly improved emulsion stability. LMP, with many hydrogen bond-forming groups, was able to provide the highest emulsion stability after 7 days in both oils compared to AA, CA and their mixtures with S. Emulsions with both oils formed weak gels with viscous and elastic characteristics due to the formation of an extensive network of water droplet aggregates. Overall, the hydrogen bond-forming agents interacted with GMO at the interface, thereby improving their presence at the water droplet surface, allowing significantly improved stability of GMO-stabilized liquid W/CO emulsions. The knowledge developed in this research can be useful in applying GMO in stabilizing liquid water-in-oil emulsion without using any crystal network.
17 Mar 2022Submitted to Journal of the American Oil Chemists' Society
17 Mar 2022Submission Checks Completed
17 Mar 2022Assigned to Editor
04 Apr 2022Reviewer(s) Assigned
14 May 2022Review(s) Completed, Editorial Evaluation Pending
11 Jun 2022Editorial Decision: Revise Major
07 Sep 20221st Revision Received
08 Sep 2022Assigned to Editor
08 Sep 2022Submission Checks Completed
08 Sep 2022Reviewer(s) Assigned
20 Sep 2022Review(s) Completed, Editorial Evaluation Pending
27 Sep 2022Editorial Decision: Revise Minor
08 Nov 20222nd Revision Received
08 Nov 2022Assigned to Editor
08 Nov 2022Submission Checks Completed
08 Nov 2022Review(s) Completed, Editorial Evaluation Pending
17 Nov 2022Editorial Decision: Accept