The core carbohydrate structure of Acacia seyal var. seyal (Gum arabic).
Nie, S-P., Wang, C., Cui, S.W., Wang, Q., Xie, M-Y., and Phillips, G.O. (2013). "The core carbohydrate structure of Acacia seyal var. seyal (Gum arabic).", Food Hydrocolloids, 32(2), pp. 221-227. doi : 10.1016/j.foodhyd.2012.12.027 Access to full text
The structure of gum arabic (Acacia seyal) has been studied using methylation analysis and 2D (COSY, TOCSY, HMQC and HMBC) NMR spectroscopy. Galacturonic acid (13.66%) is a major component not previously identified. The backbone is made up of 1,3-linked galactopyranosyl (Galp) residues substituted at O-2, O-6 or O-4 positions, which are terminated with mainly arabinofuranosyl (Araf), galacturonopyranosyl (GalpA), rhamnopyranosyl (Rhap), but occasionally with arabinopyranosyl (Arap), and glucuronopyranosyl (GlcpA) residues. There are long side chains of →3)-α-L-Araf-(1→ and →2)-α-L-Araf-(1→ linked to the backbone.
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