AI Article Synopsis
- Researchers isolated ulvan, a polysaccharide from the seaweed Ulva, using two extraction methods from samples collected on the Swedish west coast.
- * The acidic extraction yielded ulvan with 11-18% ash, some protein content, and minimal impurities, with very high molecular weights around 660,000-760,000 g/mol, predominantly composed of carbohydrates like rhamnose and glucose.
- * The extraction method significantly influenced the ulvan's molecular weight and composition, with acidic extraction leading to almost complete removal of sulfate groups, while also revealing that the ash contained essential mineral elements but no heavy metals.
Article Abstract
The cell wall polysaccharide ulvan was isolated from two species of the seaweed Ulva collected along the Swedish west coast. Acidic extraction was benchmarked against hot water extraction with enzymatic purification and against commercial ulvan. Extracted ulvan contained 11-18 % g/g of ash, some protein (up to 1.3 % g N/g) but minimal colored impurities. The ulvans had high molecular weights (660,000-760,000 g/mol) and were composed of 77-79 % g/g carbohydrates, mainly rhamnose, xylose, glucose, glucuronic acid, and iduronic acid. The extraction protocol and the ulvan source strongly impact the molecular weight and the chemical composition. Acidic extraction caused almost complete desulfation of the isolated ulvan while the other method preserved a significant degree of SO substituents. Elemental analysis of ash remaining after thermal degradation showed presence of common mineral elements such as Na, Ca, Mg, Al, and K, but none of the heavy metals Pb, Hg, or As.
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| http://dx.doi.org/10.1016/j.carbpol.2020.115852 | DOI Listing |
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