Chemical and physicochemical characterizations of the water-soluble fraction of the Commiphora Africana exudate

Abdellatif Dahi (1) , Bah Mohamed-Lemine Abdellahi (1, 2) , Mohamed Fadel Deida (2) , Nicolas Hucher (1) , Catherine Malhiac (1) , Frédéric F. Renou (1)

1 URCOM - Unité de Recherche en Chimie Organique et Macromoléculaire
2 UNA - Université de Nouakchott Al-Aasriya

The present study focuses on the chemical and physical characterization of the water-soluble fraction of the Commiphora Africana exudate. The chemical analysis proved that this fraction is mainly composed of carbohydrates and hydrophobic amino acids. Size exclusion chromatography (SEC) revealed the presence of three distinct polysaccharide populations that are all bonded to protein. In addition, both SEC and rheology demonstrated that the gum owns highly compact structure that suggests an AGP-like polymer. commiphora Africana gum exhibits excellent surface activity at concentration 2 orders of magnitude lower than the reference, acacia gum and was attributed to the fact that the three populations contribute to the surface tension lowering. This remarkable property has been confirmed by preliminary experiments on model emulsions and suggests a very promising application in formulation.

Mots clés: chemical composition; water-soluble fraction; Commiphora Africana exudate; Arabinogalactan-Protein-like polymer; compact structure; Surface activity

Domaines: Polymères; Chimie analytique; Ingénierie des aliments

Abdellatif Dahi, Bah Mohamed-Lemine Abdellahi, Mohamed Fadel Deida, Nicolas Hucher, Catherine Malhiac, et al.. Chemical and physicochemical characterizations of the water-soluble fraction of the Commiphora Africana exudate. Food Hydrocolloids, 2019, 86, pp.2-10. ⟨10.1016/j.foodhyd.2017.10.032⟩. ⟨hal-02181664⟩