The Brazilian coast has an extensive coastline with great
biodiversity of marine organisms yet to be explored. Red seaweeds
Pterocladiella capillacea (P. capillacea) and Osmundaria
obtusiloba (O. obtusiloba) are abundant in the coast of the
state of Ceara throughout the year. Although there are several
studies on biological activity of extracts of seaweeds in recent
decades, there is no information on the antioxidant, antimicrobial
and bacterial agglutination potential of these species of the
coast of the state of Ceara