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vol.50 issue2SUBSTITUTION EFFECTS ON THE MAGNETIC PROPERTIES OF NI(ME,MN)2O4 AND LI(ME,MN)2O4: COMPARISON BETWEEN ME = CR AND FEPHOTO-PK OF INDOLINE-2-THIONE author indexsubject indexarticles search
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Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

CHANDIA, NANCY P.; MATSUHIRO, BETTY; ORTIZ, JOHANNA S.  and  MANSILLA, ANDRES. CARBOHYDRATES FROM THE SEQUENTIAL EXTRACTION OF Lessonia vadosa (PHAEOPHYTA). J. Chil. Chem. Soc. [online]. 2005, vol.50, n.2, pp.501-504. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072005000200012.

Blades of Lessonia vadosa were sequentially extracted with 70% ethanol, followed by 2% CaCl2 solution,, diluted HCl (pH 2), and finally with 2% Na2CO3 solution. D-mannitol was the only low molecular weight carbohydrate obtained from the ethanolic extract. By ion-exhange chromatography of the CaCl2 extract a fraction contaning 36.7% of sulfate group was obtained. Chemical and spectroscopic analysis indicated the presence of a regular polymer of a-L-fucopyranose linked 1Æ3 and sulfated at positions O-2 and O-4. The main fraction isolated from the acidic extract by ion-exchange chromatography was shown to be composed of a complex a-L-fucan with 28.9% of sulfate. Alginic acid (17.0% of dry algae) was the major polysaccharide obtained in the sequential extraction

Keywords : Lessonia vadosa; alginic acid; mannitol; sulfated fucans.

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