Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 81, Issue -, Pages 912-919Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2015.09.030
Keywords
Ulva intestinalis; Sulfated polysaccharide; Solvent extraction; Antioxidant activity; Characterization
Funding
- Thailand Institute of Scientific and Technological Research, National Research University (NRU) Project of Thailand
- King Mongkut's University of Technology Thonburi, Thailand
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Ulva intestinalis, a tubular green seaweed, is a rich source of nutrient, especially sulphated polysaccharides. Sulphated polysaccharides from U. intestinalis were extracted with distilled water, 0.1N HCl, and 0.1N NaOH at 80 degrees C for I, 3, 6, 12, and 24h to study the effect of the extraction solvent and time on their chemical composition and antioxidant activity. Different types of solvents and extraction time had a significant influence on the chemical characteristics and antioxidant activity (p < 0.05). Monosaccharide composition and FT-IR spectra analyses revealed that sulphated polysaccharides from all solvent extractions have a typical sugar backbone (glucose, rhamnose, and sulphate attached at C-2 or C-3 of rhamnose). Sulphated polysaccharides extracted with acid exhibited greater antioxidant activity than did those extracted with distilled water and alkali. The results indicated that solvent extraction could be an efficacious method for enhancing antioxidant activity by distinct molecular weight and chemical characteristic of sulphated polysaccharides. (C) 2015 Elsevier B.V. All rights reserved.
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