ANALYSIS OF Botryocladia occidentalis (RHODOPHYTA) SULFATED GALACTANS AS MODULATORS OF THROMBIN GENERATION
DOI:
https://doi.org/10.18817/repesca.v15i1.3592Resumo
The cell-wall anatomy of Botryocladia occidentalis (Rhodophyta) contains high molecular mass sulfated galactans (BoSGs) with anti- and procoagulant properties, but their effects on thrombin generation (TG) were not explored. This study evaluated BoSGs by different extraction times (3, 6, 16 or 24 h) on the yield, physical-chemical features and in vitro effects on intrisincatly (cephalin) -induced TG in 60-fold diluted human plasma using continuous system. Yield of papain-assisted extraction from ground dehydrated matter increased (p<0.05) with time from 5.81±0.71% (BoSGs-3) to 10.03±0.74% (BoSGs-24), with a difference reaching 4.49%. Agarose / polyacrylamide gels electrophoreses revealed profiles of discrete charge density patterns and molecular masses >100kDa among all the wood color-visualized BoSGs after independent staining with toluidin blue or Stains-All vs. to glycosaminoglycans standards-revealed color-code. Infrared spectroscopy characterized a system of agangan / carrageen unrelated BoSGs structure. Regarting TG assay, BoSGs-3 abolished TG at concentration >4.1 μg competing with thrombin, but induced TG in cepahlin-free system. Heparin also inhibited TG, but not stimulated it. Therefore, the technique could be used to optimize yield and select BoSGs with in vitro TG modulation.