Gravity-driven syneresis in model low-fat mayonnaise

Qimeng Wu, Melle T.J.J.M. Punter, Thomas E. Kodger, Luben Arnaudov, Bela M. Mulder, Simeon Stoyanov, Jasper Van Der Gucht*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Low-fat food products often contain natural, edible polymers to retain the desired mouth feel and elasticity of their full-fat counterparts. This type of product, however, can suffer from syneresis: densification due to the expulsion of fluid. Gaining insight into the physical principles governing syneresis in such soft hybrid dispersions remains a challenge from a theoretical perspective, as experimental data are needed to establish a basis. We record non-accelerated syneresis in a model system for low-fat mayonnaise: a colloid polymer mixture, consisting of oil in water emulsion with starch in the aqueous phase. We find the flow rate of expelled fluid to be proportional to the difference in hydrostatic pressure over the system. The osmotic pressure of the added starch, while being higher than the hydrostatic pressure, does not prevent syneresis because the soluble starch is lost to the expelled fluid. From these findings, we conclude that forced syneresis in these systems can be described as a gravity-driven porous flow through the densely packed emulsion, explainable with a model based on Darcy's law.

Original languageEnglish
Pages (from-to)9474-9481
Number of pages8
JournalSoft Matter
Volume15
Issue number46
DOIs
Publication statusPublished - 31 Oct 2019

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