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vol.51 issue1POLYCHELATES OF POLY(4-VINYLPYRIDINE) WITH Cu(II) AND Zn(II): SYNTHESIS,CHARACTERIZATION, AND SEMI-EMPIRICA CALCULATIONSSYNTHESIS AND CHARACTERIZATION OF CHITOSAN ALKYL PHOSPHATE author indexsubject indexarticles search
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Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

MATSUHIRO, BETTY; PRESLE, LUIS C; SAENZ, CARMEN  and  URZUA, CARLOS C. STRUCTURAL DETERMINATION AND CHEMICAL MODIFICATIONS OF THE POLYSACCHARIDE FROM SEEDS OF Prosopis chilensis Mol. (Stuntz). J. Chil. Chem. Soc. [online]. 2006, vol.51, n.1, pp.809-813. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072006000100010.

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 1H and13C NMR spectroscopy indicated that the polysaccharide was a galactomannan with a chain of D-mannopyranosyl residues linked b 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 135º NMR spectrum indicated that the primary alcoholic groups of galactopyranosyl and unbranched mannopyranosyl residues were fully oxidised

Keywords : Prosopis chilensis; seeds; polysaccharide; galactomannan; carboxymethylation; TEMPO oxidation.

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