RT journal article
T1 New structural features of Acacia tortuosa gum exudate
A1 Martínez, Maritza
A1 Beltrán, Olga
A1 Ricón, Fernando
A1 León de Pinto, Gladys
A1 Igartuburu Chinchilla, José Manuel
A2 Química Orgánica
K1 acacia tortuosa
K1 gum exudate
K1 NMR spectroscopy
K1 proteic fraction
K1 galactosylation
AB Acacia tortuosa produces a clear gum, very soluble in water. Previous reports showed that it was constituted by four fractions, one of them an arabinogalactan–protein complex. The elucidation of the A. tortuosa gum structure by the combination of classical chemical methods, size exclusion chromatography and NMR spectroscopy, was the objective of this investigation. The data obtained show that the heteropolysaccharide is an arabinogalactan type II, highly ramified, with lateral chains at C-2 as well as at C-6 of the galactose 3-O residues; mono-O-substituted galactoses were not detected. There are residues of mannose, the arabinose, pyranose predominantly, is terminal and 2-O-linked. The abundance of the 4-O-methyl-a-D-glucuronic acid was not previously reported. The proteic fraction is probably represented by an arabinogalactan–protein complex that binds poorly with b-glucosyl Yariv reagent, and twoglycoproteins. The NMR spectra suggest that the carbohydrate links to hydroxyproline through the galactose(galactosylation).
PB Elsevier
YR 2015
FD 2015-03
LK http://hdl.handle.net/10498/20343
UL http://hdl.handle.net/10498/20343
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 07-nov-2026