Carbohydrates from the sequential extraction of lessonia vadosa (phaeophyta)

• NANCY P. CHANDIA ^[1] ; BETTY MATSUHIRO ^[1] ; JOHANNA S. ORTIZ ^[1] ; ANDRES MANSILLA ^[2]
  1. [1] Universidad de Santiago de Chile

     Universidad de Santiago de Chile

     Santiago, Chile

     
  2. [2] Universidad de Magallanes

     Universidad de Magallanes

     Punta Arenas, Chile

     
• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 50, Nº. 2, 2005, págs. 501-504
• Idioma: inglés
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• Resumen

  • 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