Phenolic residues in spruce galactoglucomannans improve stabilization of oil-in-water emulsions

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: M. Lehtonen, M. Merinen, P.O. Kilpeläinen, C. Xu, S.M. Willför, K.S. Mikkonen
Publisher: Elsevier
Publication year: 2018
Journal: Journal of Colloid and Interface Science
Journal acronym: J. Colloid Interface Sci.
Volume number: 512
Start page: 536
End page: 547
Number of pages: 12
ISSN: 0021-9797
eISSN: 1095-7103


Abstract

Hypothesis: Amphiphilic character of surfactants drives them at the interface of dispersed systems, such as emulsions. Hemicellulose-rich wood extracts contain assemblies (lignin-carbohydrate complexes, LCC) with natural amphiphilicity, which is expected to depend on their chemical composition resulting from the isolation method. Lignin-derived phenolic residues associated with hemicelluloses are hypothesized to contribute to emulsions' interfacial properties and stability.

Experiments: We investigated the role of phenolic residues in spruce hemicellulose extracts in the stabilization of oil-in-water emulsions by physical and chemical approach. Distribution and changes occurring in the phenolic residues at the droplet interface and in the continuous phase were studied during an accelerated storage test. Meanwhile, the physical stability and lipid oxidation in emulsions were monitored.

Findings: Naturally associated lignin residues in GGM act as vehicles for anchoring these hemicelluloses into the oil droplet interface and further enable superior stabilization of emulsions. By adjusting the isolation method of GGM regarding their phenolic profile, their functionalities, especially interfacial behavior, can be altered. Retaining the native interactions of GGM and phenolic residues is suggested for efficient physical stabilization and extended protection against lipid oxidation. The results can be widely applied as guidelines in tailoring natural or synthetic amphiphilic compounds for interfacial stabilization.


Keywords

Emulsion stability, Phenolic residues, Spruce galactoglucomannans

Last updated on 2019-12-12 at 03:58