Structural characterization and emulsifying properties of polysaccharides of Acacia mearnsii de Wild gum

► Polysaccharides from Acacia mearnsii gum from Brazilian trees are first investigated. ► The polysaccharides were characterized as non homogenous, acidic arabinogalactans. ► The polysaccharides behave distinctly in tensiometry tests and as emulsifiers. ► A commercial gum was analyzed similarly and compared with the studied polysaccharides.