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The in vitro anticoagulant activity of 41 water extracts of various seaweeds from Baja California Sur, Mexico was evaluated. In this study, nine extracts exhibited anticoagulant activity in the prothrombin time assay, and 29 extracts were active in the activated partial thromboplastin time assay. The water extract obtained at 25°C from the brown seaweed Eisenia arborea was the most active in both assays, increasing the normal blood clotting-time over 300 s at 100 mg mL^-1. The fractionation of this extract by anion exchange chromatography yielded 3 fractions. Fraction 2 eluted with 1.0 M sodium chloride increased the clotting-time over 300 s in the activated partial thromboplastin time assay at 5 µg mL^-1, being more active than sodium heparin. Chemical and spectroscopic analysis of fraction 2 showed to be a heterofucan sulfated composed by 56.2% ±0.1 of total sugars, and 45% of sulfates. The neutral sugar constituents of the active heterofucan was determined to be 47.6% flucose, 35.5% xylose and 16.9% thamnose, with substitution of sulfate groups at C-4 (axial), and minor substitutions at C-2 and-or C-3.

Palabras clave: La Paz; Baja California Sur; activated partial thromboplastin time; heparin; heterofucan; prothrombin time; sulfated polysaccharides

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