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

机译:多米江Gra(Kützing)Sonder ex Dickie和江cil(Polastino&Oliveira)的非极性组分的抗氧化活性和化学成分

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摘要

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 profile, 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 Δ9; 20:3 Δ6,9,12, 20:4 Δ5,8,11,14. We found no specificity of compounds in either species. However, G. birdiae, presented higher contents of carotenoids and arachidonic acid than G. domingensis.
机译:多米草(Gracilaria domingensis)(古琴)(Sonder ex Dickie)和小and(Gracilaria birdiae)(Plastino和Oliveira)(Gracilariales,Rhodophyta)是巴西沿海的海藻。基于其经济和药学重要性,我们研究了这两种物种的甲醇,乙酸乙酯和己烷提取物的抗氧化活性。己烷提取物具有很高的抗氧化活性,比较分析表明小鸟G是最活跃的物种。这些馏分的化学研究显示了几种类胡萝卜素和脂肪酸,以及胆固醇和谷固醇衍生物。禽类的HPLC-DAD分析显示紫黄质(0.04μg.mg-1的干物质),花药黄质(5.31μg.mg-1),阿罗黄质(0.09μg.mg-1),玉米黄质(0.45μg.mg-1) )和β-胡萝卜素(0.37μg.mg-1)作为主要类胡萝卜素。 G. domingensis显示出相似的类胡萝卜素特征,但是其浓度远低于G. birdiae。气相色谱与质谱联用用于确定这些海藻的其他非极性化合物。在这两个研究物种中检测到的主要化合物是脂肪酸16:0; 18:1Δ9; 20:3Δ6,9,12,20:4Δ5,8,11,14。我们发现这两种物种均未发现化合物的特异性。然而,比起G. domingensis,G。birdiae的类胡萝卜素和花生四烯酸含量更高。

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