title: Chemical and spectroscopic studies of Cercidium praecox gum exudate.
abstract: The structure of the polysaccharide from Cercidium praecox (R&P) Harms gum exudate has been studied by Smith degradation, by sugar and methylation analyses, and by 13C NMR spectroscopy. The results showed a (1-->4)-xylan core. Some xylose residues are substituted at O-2 by alpha-D-glucuronic acid and 4-O-methyl-alpha-D-glucuronic acid residues. beta-D-Glucuronic acid is present, probably as terminal residues. The arabinose is present as alpha-L-furanose and beta-L-pyranose.
authors.affiliation: Centro de Investigaciones en Química de los Productos Naturales, Facultad de Humanidades y Educación, Universidad del Zulia, Maracaibo, Venezuela.
authors.forename: G
authors.initials: G
authors.lastname: León de Pinto
authors.forename: M
authors.initials: M
authors.lastname: Martínez
authors.forename: C
authors.initials: C
authors.lastname: Rivas
mesh_terms: D001089:Arabinose / Q000032:analysis; D002240:Carbohydrate Sequence; D002854:Chromatography, Paper; D007887:Fabaceae / Q000737:chemistry*; D005965:Glucuronates / Q000032:analysis; D020723:Glucuronic Acid; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D010936:Plant Extracts / Q000737:chemistry*; D010946:Plants, Medicinal; D011134:Polysaccharides / Q000737:chemistry*; D014990:Xylans / Q000737:chemistry; D014994:Xylose / Q000032:analysis
chemical_list: D005965:Glucuronates; D010936:Plant Extracts; D011134:Polysaccharides; D014990:Xylans; D020723:Glucuronic Acid; D014994:Xylose; D001089:Arabinose