Adsorption study on the formation of interfacial layers based on birch glucuronoxylans

Felix Abik* (Corresponding Author), Katariina Solin, Sami Hietala, Orlando J. Rojas, Thao Minh Ho, Kirsi S. Mikkonen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Glucuronoxylans (GX), particularly crude fractions obtained by pressurized hot water extraction of birch wood, act as potent emulsifiers and stabilizers against physical separation and lipid oxidation. Herein, we studied the adsorption of GX on hydrophobic interfaces to correlate their multicomponent character towards the formation of interfacial layers in emulsions. Dynamic interfacial tension (DIFT) and quartz crystal microgravimetry with dissipation monitoring (QCM-D) were applied to various GX fractions and the results compared with those from cellulose-based emulsifiers. The roles of residual lignin and polysaccharides are discussed considering the formation of interfacial layers during emulsification. The DIFT of the different GXs reached quasi-equilibrium faster as the lignin concentration increased, implying a correlation between the rate of adsorption and the residual lignin content. The effect of NaCl addition was more pronounced in polysaccharide-rich fractions, indicating that the polysaccharide fraction modulated the effect of ionic strength. QCM-D showed that despite the fast adsorption exhibited by the lignin-rich GX extract in the DIFT curves, the adsorbed materials were lightweight, suggesting that the polysaccharide fraction built the bulk of the interfacial layer. These results provide a foundation towards understanding the role of GX in interfacial stabilization beyond traditional plant-based counterparts.

Original languageEnglish
Article number122242
Number of pages9
JournalCarbohydrate Polymers
Volume339
DOIs
Publication statusPublished - Sept 2024
MoE publication typeA1 Journal article-refereed

Keywords

  • Adsorption
  • Dynamic interfacial tension
  • Hemicelluloses
  • Interfacial activity
  • Lignin

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