Original tools for xanthan hydrophobization in green media: Synthesis and characterization of surface activity

Mira Abou Dib; Nicolas Hucher; Ecaterina Gore; Michel Grisel

doi:10.1016/j.carbpol.2022.119548

Original tools for xanthan hydrophobization in green media: Synthesis and characterization of surface activity

Carbohydr Polym. 2022 Sep 1:291:119548. doi: 10.1016/j.carbpol.2022.119548. Epub 2022 Apr 30.

Authors

Mira Abou Dib¹, Nicolas Hucher¹, Ecaterina Gore¹, Michel Grisel²

Affiliations

¹ Normandie Univ, UNILEHAVRE, FR 3038 CNRS, URCOM, 25 rue Philippe Lebon, BP 1123, 76063 Le Havre cedex, France.
² Normandie Univ, UNILEHAVRE, FR 3038 CNRS, URCOM, 25 rue Philippe Lebon, BP 1123, 76063 Le Havre cedex, France. Electronic address: michel.grisel@univ-lehavre.fr.

PMID: 35698378
DOI: 10.1016/j.carbpol.2022.119548

Abstract

Xanthan gum (XG) was modified through esterification using various alkenyl succinic anhydrides in green media. FTIR and NMR spectroscopy confirmed that the alkenyl succinic hydrophobic groups were successfully grafted on octenyl-grafted (XG-C8), dodecenyl-grafted (XG-C12), and hexadecenyl-grafted (XG-C16) xanthan backbone. Grafted chains were evaluated by degree of succinylation (DS). Modification enhance the surface activity of xanthan by decreasing surface tension from 72 until 37 and 58 mN/m due to respectively long alkenyl chain for XG-C16 (DS = 2.2 ± 0.2%) and high grafting rate for XG-C12 (DS = 16.9 ± 1.9%). These original tools are of great interest to optimize both the DS and the properties of xanthan gum by varying reaction parameters like pH range, reaction time and the mole excess of the grafting reagents to xanthan monomeric units.

Keywords: (1)H NMR spectroscopy; Alkenyl succinic anhydrides; Green chemical modification; Surface active derivatives; Xanthan.

MeSH terms

Hydrophobic and Hydrophilic Interactions
Polysaccharides, Bacterial* / chemistry
Succinic Anhydrides* / chemistry
Surface Tension

Substances

Polysaccharides, Bacterial
Succinic Anhydrides
xanthan gum