| Título: | Structural determination and chemical modifications of the polysaccharide from seeds of Prosopis chilensis Mol. (Stuntz) |
| Autores: |
Matsuhiro, Betty Presle, Luis C. Sáenz, Carmen Urzúa, Carlos C. |
| Fecha: |
2009-05-12 2009-05-12 2006-03 |
| Publicador: | SOCIEDAD CHILENA DE QUIMICA |
| Fuente: |
Ver documento |
| Tipo: | Artículo de Revista |
| Tema: |
TEMPO-MEDIATED OXIDATION GALACTOMANNANS CELLULOSE |
| Descripción: | The polysaccharide extracted from Prosopis chilensis seeds in acidic medium showed by total hydrolysis and gas-liquid chromatography analysis of the alditol acetates to be composed of galactose and mannose in the molar ratio 1.0:1.9. Studies by methylation and H-1 and C-13 NMR spectroscopy indicated that the polysaccharide was a galactomannan with a chain of D-mannopyranosyl residues linked beta 1 -> 4 which carried alternatively a-D-galactopyranosyl residues at position O-6 of D-mannose units. The chemical modification of the galactomannan by reaction with sodium chloroacetate afforded in 95.3% yield, a derivative which gave a very viscous solution with water. By titration it was determined a carboxymethylation degree of 0.42 indicating that 64% of the alcoholic groups were etherified. Reaction of the galactomannan with TEMPO-NaCl-NaOBr system gave a water soluble polysaccharide. The DEPT 135 degrees NMR spectrum indicated that the primary alcoholic groups of galactopyranosyl and unbranched mannopyranosyl residues were fully oxidised. |
| Idioma: | Inglés |