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

Abstract

Polysaccharides (GNF) from Acacia mearnsii de Wild gum exudates, collected from trees growing in the south of Brazil, were characterized ((13)C and HSQC NMR, GC-MS, colorimetric assays). A commercial gum arabic (GAC) was analyzed similarly and compared with GNF. There were differences, consistent with distinct behavior in tensiometry tests and as emulsion stabilizer. GNF had a higher protein content than GAC, with small differences in the monosaccharide composition, the greater one being the lower uronic acid content of GNF (4%), compared with GAC (17%). GNF had a much broader molecular mass distribution, M(w)/M(n), and a lower M(w). GNF was more efficient in lowering the surface tension of water and saline solutions and was more efficient in emulsifying castor oil droplets. Results were discussed taking into account structural and molecular differences between the studied gums. It was concluded that polysaccharides from A. mearnsii de Wild are candidates as substitutes of currently commercialized arabic gums (Acacia senegal and Acacia seyal) having, depending on their application, improved properties.

The electrochemical impedance spectroscopy behavior of poly(aniline) nanocomposite electrodes modified by Layer-by-Layer deposition

“…In an optimistic view, the synergistic effect may produce a unique material which combines the electrochemical activity presented by the conducting polymers and the good processability in water, sustainability, biodegradability and low toxicity showed by natural polymers [25,26]. This polymer has several industrial applications due to its tensoactive and emulsifier properties [27]. Interestingly in despite of its industrial appeal, some countries use only the Acacia tree for the production of tannin and charcoal and some tons of gum simply wasted away.…”

Synergistic effect of halide ions and gum arabic for the corrosion inhibition of API5L X70 pipeline steel in H2SO4

“…Because the API5L X70 pipeline steel surface has extra positive charges in blank solution from E q = 0 analysis, I − will be firstly adsorb on the metal surface. Third, the interfacial activity of GA is attributed to their amphiphilic nature since the polysaccharide fractions are highly water soluble, containing hydroxyl functional group (OH), and carboxyl functional group (COOH), whereas the protein rich fraction is responsible for their hydrophobic behavior . In acid solution, the carbonyl oxygen (CO) may be protonated and the molecule exists as a polycation.…”

Purification, structural data and biological properties of polysaccharide from Prunus amygdalus gum

“…The AGPs structure was similar to other exudate gums. In fact, nectarine gum (Prunus persica) (Simas-Tosin et al, 2009), Acacia mearnsii gum (Grein et al, 2013), Sterculia apetala gum (Marvelys et al, 2006) and gum ghatti (Tischer et al, 2002) have also arabinogalactan structures. These high molecular weight polymers and others may exhibit therapeutic and medicinal properties, for example antitumor, anti-inflammatory, antioxidant and antimicrobial activities (Leung et al, 2006;Caili et al, 2007;Chen et al, 2008;Luo et al, 2008;Lu et al, 2010;Sila et al, 2014).…”