Structural determination and chemical modifications of the polysaccharide from seeds of Prosopis chilensis Mol. (Stuntz)

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Structural determination and chemical modifications of the polysaccharide from seeds of Prosopis chilensis Mol. (Stuntz)

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Structural determination and chemical modifications of the polysaccharide from seeds of Prosopis chilensis Mol. (Stuntz)

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Título: Structural determination and chemical modifications of the polysaccharide from seeds of Prosopis chilensis Mol. (Stuntz)
Autor: Matsuhiro, Betty; Presle, Luis C.; Sáenz Hernández, Carmen Luisa; Urzúa, Carlos C.
Resumen: 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.
URI: http://www.captura.uchile.cl/handle/2250/5874
Fecha: 2006-03
Cita del item: JOURNAL OF THE CHILEAN CHEMICAL SOCIETY Volume: 51 Issue: 1 Pages: 809-813 Published: MAR 2006


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