title: Structural features of an arabinogalactan gum exudates from Spondias dulsis (Anacardiaceae).
abstract: The tree Spondias dulcis, located in Venezuela, exudes a light-brown gum. The polysaccharide, isolated from the original gum, contains galactose, arabinose, mannose, rhamnose, glucuronic acid, and its 4-O-methyl derivative. Application of chemical methods, in combination with 1D and 2D NMR spectroscopy afforded interesting structural features of the gum polysaccharide. The unequivocal presence of rhamnose in the polymer structure was confirmed by chemical and spectral data [1H (1.03 ppm); 13C (16.92 ppm)]. Also confirmed was the existence of 3-O- and 6-O-substitutes galactose residues by the spectral data correlations observed in Heteronuclear Multiple Quantum Coherence (HMQC) and Heteronuclear Multiple Bond Correlation (HMBC). Also observed were unequivocal resonances for beta-D-glucuronic acid and its 4-O-methyl derivative, and the presence of 3-O-alpha-L-arabinofuranose and 3-O-beta-L-arabinopyranose residues.
authors.affiliation: Centro de Investigaciones en Química de los Productos Naturales, Facultad de Humanidades y Educación, La Universidad del Zulia, Apartado 526, Maracaibo, Venezuela.
authors.forename: Maritza
authors.initials: M
authors.lastname: Martínez
authors.forename: Gladys
authors.initials: G
authors.lastname: León de Pinto
authors.forename: Lilian
authors.initials: L
authors.lastname: Sanabria
authors.forename: Olga
authors.initials: O
authors.lastname: Beltrán
authors.forename: José M
authors.initials: JM
authors.lastname: Igartuburu
authors.forename: Ali
authors.initials: A
authors.lastname: Bahsas
mesh_terms: D027926:Anacardiaceae / Q000737:chemistry*; D001089:Arabinose / Q000032:analysis; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002851:Chromatography, High Pressure Liquid; D005685:Galactans / Q000032:analysis* / Q000737:chemistry; D005690:Galactose / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy; D008358:Mannose / Q000032:analysis; D008969:Molecular Sequence Data; D015394:Molecular Structure; D018514:Plant Structures / Q000737:chemistry; D011134:Polysaccharides / Q000032:analysis* / Q000737:chemistry; D012210:Rhamnose / Q000032:analysis; D014994:Xylose / Q000032:analysis
chemical_list: D005685:Galactans; D011134:Polysaccharides; D014994:Xylose; D001089:Arabinose; D008358:Mannose; D012210:Rhamnose; C005653:arabinogalactan; D005690:Galactose