Antioxidant activity and chemical composition of the non polar fraction of Gracilaria domingensis (Kützing) Sonder ex Dickie and Gracilaria birdiae (Plastino & Oliveira)

Abstract

Gracilaria domingensis (Kützing) Sonder ex Dickie and Gracilaria birdiae (Plastino & Oliveira) (Gracilariales, Rhodophyta) are seaweeds that occur on the Brazilian coast. Based on their economic and pharmaceutical importance, we investigated the antioxidant activity of the methanolic, ethyl acetate and hexane extracts of both species. The hexane extracts display a high antioxidant activity and comparative analyses indicated G. birdiae as the most active species. Chemical investigation of these fractions showed several carotenoids and fatty acids, as well as cholesterol and sitosterol derivatives. HPLC-DAD analysis of G. birdiae showed violaxanthin (0.04 μg.mg -1 of dry material), antheraxanthin (5.31 μg.mg -1 ), aloxanthin (0.09 μg.mg -1 ), zeaxanthin (0.45 μg.mg -1 ) and β-carotene (0.37 μg.mg -1 ) as the major carotenoids. G. domingensis showed a similar carotenoid profi le, however, with much lower concentration than G. birdiae. Gas chromatography coupled to mass spectrometry was used to determine other nonpolar compounds of these seaweeds. The main compounds detected in both studied species were the fatty acids 16:0; 18:1 Δ 9 ; 20:3 Δ 6,9,12 , 20:4 Δ 5,8,11,14 . We found no specifi city of compounds in either species. However, G. birdiae, presented higher contents of carotenoids and arachidonic acid than G. domingensis.

<b><i>In vitro</i> evaluation of antioxidant activity of methanolic extracts obtained from seaweeds endemic to the coast of Ceará, Brazil

“…Antioxidant activity has been found in several Brazilian algal species, for example, Gracilaria birdiae and G. cornea collected at Flecheiras Beach (Ceará) (Souza et al, 2011); Amansia multifida and Meristiella echinocarpa collected at Paracuru Beach (Ceará) (Alencar et al, 2014); G. domingensis and G. birdiae from Cotovelo Beach (Natal) (Guaratini, Lopes, Marinho-Soriano, Colepicolo, & Pinto, 2012); 26 species of green, red and brown marine algae from the States of Rio de Janeiro and Espírito Santo (Martins et al, 2013); and 11 species of green, red and brown marine algae from the coast of Natal (Costa et al, 2010).…”

Preliminary data of antioxidant activity of green seaweeds (Ulvophyceae) from the Southwestern Atlantic and Antarctic Maritime islands

“…The isolation and chemical characterization of secondary metabolites are relevant since some of these compounds demonstrate biological activities against human pathologies (Camarero et al, 1990;Gagioti et al, 1995;Maschek & Baker, 2008). Specifically, antioxidants are the primary natural product known to be inhibitors of reactive oxygen species (ROS) accumulation and can prevent skin oxidative stress, skin cancer and premature skin aging (Guaratini et al, 2007;Guaratini et al, 2012). As such, they have been often applied in the pharmaceutical, nutraceutical and cosmetic industries (Guaratini et al, 2007;Hwang et al, 2010;Guaratini et al, 2012).…”

“…Specifically, antioxidants are the primary natural product known to be inhibitors of reactive oxygen species (ROS) accumulation and can prevent skin oxidative stress, skin cancer and premature skin aging (Guaratini et al, 2007;Guaratini et al, 2012). As such, they have been often applied in the pharmaceutical, nutraceutical and cosmetic industries (Guaratini et al, 2007;Hwang et al, 2010;Guaratini et al, 2012).…”

Uma Análise Da Oferta No Varejo Brasileiro De Produtos Oriundos De Processo De Produção Com Bem-Estar Animal

“…al. 2012a;RODRIGUES, 2015;GUARATINI et al 2012;WELLS et al, 2016). Podendo, dessa maneira ser uma fonte alimentar alternativa para criação de aves caipiras.Sendo assim, objetivou-se avaliar o potencial nutricional da Gracilaria birdiae do litoral potiguar, mediante verificação da composição físico-química e verificar seus efeitos sobre a digestibilidade dos seus nutrientes em ração para aves.As macroalgas foram coletadas e armazenadas em caixas isotérmicas contendo água do mar.…”