Structural determination and chemical modifications of the polysaccharide from seeds of Prosopis chilensis Mol. (Stuntz)
Author | dc.contributor.author | Matsuhiro, Betty | |
Author | dc.contributor.author | Presle, Luis C. | es_CL |
Author | dc.contributor.author | Sáenz Hernández, Carmen Luisa | es_CL |
Author | dc.contributor.author | Urzúa, Carlos C. | es_CL |
Admission date | dc.date.accessioned | 2009-05-12T11:43:36Z | |
Available date | dc.date.available | 2009-05-12T11:43:36Z | |
Publication date | dc.date.issued | 2006-03 | |
Cita de ítem | dc.identifier.citation | JOURNAL OF THE CHILEAN CHEMICAL SOCIETY Volume: 51 Issue: 1 Pages: 809-813 Published: MAR 2006 | en |
Identifier | dc.identifier.issn | 0717-9324 | |
Identifier | dc.identifier.uri | https://repositorio.uchile.cl/handle/2250/120098 | |
Abstract | dc.description.abstract | 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. | en |
Lenguage | dc.language.iso | en | en |
Publisher | dc.publisher | SOCIEDAD CHILENA DE QUIMICA | en |
Keywords | dc.subject | TEMPO-MEDIATED OXIDATION | en |
Título | dc.title | Structural determination and chemical modifications of the polysaccharide from seeds of Prosopis chilensis Mol. (Stuntz) | en |
Document type | dc.type | Artículo de revista |
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