石莼(Ulva lactuca L.)营养成分及多糖组成分析

为使人们对石莼的食用价值有更加深入的了解,扩展其消费市场,促进石莼资源的开发及高值化利用,本文对石莼的主要营养成分、氨基酸组成、部分微量元素含量进行了测定,同时对其主要活性成分石莼多糖进行了红外光谱与单糖组成分析。结果表明,石莼中蛋白质、碳水化合物、粗纤维、脂肪、灰分含量分别为(%):22.03、38.00、8.77、1.11、30.09,富含人体必需的Ca、Mg、Fe等微量元素,氨基酸种类齐全且必需氨基酸含量高达5.90 g/100 g;经红外光谱与高效液相色谱分析表明,从石莼提取出的石莼多糖的主要单糖组成为鼠李糖(45.23%)、木糖(26.04%)和葡萄糖(23.73%),且有糖醛酸与硫酸基存在。

Analysis on Nutritional Component and Polysaccharide Composition of Ulva lactuca L.

In order to enable people have a deeper understanding of the edible value of Ulva lactuca L,expand its consumer market,thus promoting the processing and high-value utilization of Ulva lactuca L. resources,the main nutritional components,amino acids composition content and parts of content of microelements in Ulva Lactuca L. were determined,then infrared spectroscopy method and HPLC method were used to analyze the composition of polysaccharide extracted from Ulva Lactuca L. The results showed that the contents of the protein,carbohydrate,crude fat,crude fiber and ash of the Ulva Lactuca L. were 22.03%,38.00%,8.77%,1.11%,30.09%,respectively. Ulva Lactuca L. was rich in human essential trace elements such as calcium,magnesium,iron. The amino acid varieties of the Ulva Lactuca L. were abundant,and the essential amino acids contents reached up to 5.9 g/100 g.Analysis of infrared spectrum and HPLC showed that the polysaccharide extracted from Ulva Lactuca L was mainly consisted of rhamnose(45.23%),xylose(26.04%),glucose(23.73%)and it contained ionic groups such as the uronic acid and the sulfonic acid.