کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
604334 | 880304 | 2012 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Chemical characterization and antioxidant activity of sulfated polysaccharide from the red seaweed Gracilaria birdiae Chemical characterization and antioxidant activity of sulfated polysaccharide from the red seaweed Gracilaria birdiae](/preview/png/604334.png)
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).The rheological behavior of Gb sulfated polysaccharide exhibits a gel-like behavior close to the one observed in commercial agar.The antioxidant properties of Gb sulfated polysaccharide were evaluated by measuring DPPH free-radical scavenging effect, showing that this polysaccharide has a moderate effect in inhibiting the formation of those radicals.
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Journal: Food Hydrocolloids - Volume 27, Issue 2, June 2012, Pages 287–292