Chemical characterization and antioxidant activity of sulfated polysaccharide from the red seaweed Gracilaria birdiae |
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Authors: | Bartolomeu W.S. Souza,Miguel A. Cerqueira,Ana I. Bourbon,Ana C. Pinheiro,Joana T. Martins,José A. Teixeira,Manuel A. Coimbra,Antó nio A. Vicente |
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Affiliation: | 1. IBB – Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal;2. Departamento de Química, Universidade de Aveiro, 3810-193 Aveiro, Portugal;3. Departamento de Engenharia de Pesca, Universidade Federal do Ceará, Fortaleza - Ceará, Brazil |
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Abstract: | Hydrocolloids from seaweeds have interesting functional properties, such as antioxidant activity and gelling ability. A polysaccharide was isolated by aqueous extraction at 90 °C from the red seaweed Gracilaria birdiae (Gb), with a yield of 27.2% of the seaweed dry weight. The sulfate content of the polysaccharide was 8.4% and the main sugars present were galactose (65.4 mol%), 3,6-anhydrogalactose (25.1 mol%) and 6-O-methylgalactose (9.2 mol%). Gel permeation chromatography showed that Gb polysaccharide is a heterogeneous system, with molar mass at the main peak of 3.7 × 105 g mol−1 and a shoulder of 2.6 × 106 g mol−1. The sulfated polysaccharide of Gb characterized by FTIR exhibits the characteristic bands of agarocolloids (at 1375 and 770 cm−1). |
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Keywords: | Gracilaria Sulfated polysaccharide Antioxidant activity |
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