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 SO3 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.

中文翻译：

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从Ulva spp中回收的细胞壁ulvans的组成和结构。沿瑞典西海岸。

从瑞典西海岸收集的两种海藻Ulva中分离出细胞壁多糖ulvan。酸性提取相对于酶促纯化的热水提取以及商业用ulvan的基准。提取的ulvan包含11-18％g / g的灰分，一些蛋白质（最高1.3％g N / g），但有色杂质极少。ulvans具有高分子量（660,000-760,000 g / mol），并且由77-79％g / g的碳水化合物组成，主要是鼠李糖，木糖，葡萄糖，葡萄糖醛酸和艾杜糖醛酸。提取方案和ulvan来源强烈影响分子量和化学组成。酸性萃取使分离出的ulvan几乎完全脱硫，而另一种方法保留了相当程度的SO3取代基。