Antioxidant activity and chemical composition of the non polar fraction of Gracilaria domingensis (Kützing) Sonder ex Dickie and Guacilaria birdiae (Plastino & Oliveira) - Guaratini, Thais; Lopes, Norberto Peporine; Soriano, Eliane Marinho; Colepicolo, Pio; Pinto, Ernani (Revista Brasileira de Farmacognosia, 2012)