裂叶荨麻主要营养成分及重金属安全性评价

Assessment of Nutritional Contents and Heavy Mental Security of Urtica fissa

摘要:

分析了裂叶荨麻(Urtica fissa Pritz.)嫩茎叶的矿物质、维生素、蛋白质、氨基酸和重金属等含量，采用模糊识别法和氨基酸系数比值法，对裂叶荨麻嫩茎叶蛋白质营养价值进行了评价。结果表明，裂叶荨麻矿物质除Na和Se外，其余各元素的含量、尼克酸和膳食纤维含量均高于其它蔬菜，其蛋白质含量为6.2%(鲜重)，必需氨基酸种类齐全，必需氨基酸占总氨基酸的41.69%；裂叶荨麻嫩茎叶蛋白质贴近度为0.8667，氨基酸比值系数为62.53，仅次于芹菜，第一限制性氨基酸为含硫氨基酸。裂叶荨麻嫩茎叶中的Hg、Pb、As含量均未超过蔬菜的卫生限量标准，属于可食安全范围。

Abstract:

Several major nutrients contents, such as mineral elements, proteins, amino acids and vitamins，from fresh leaves and stems of Urtica fissa were analyzed, and the protein nutritive value was evaluated by using fuzzy identifyication mode and ratio coefficient of amino acid. The results showed that the contents of niacin, dietary fiber and the most mineral elements in U. fissa were higher than other vegetables except for sodium (Na) and selenium (Se). The protein content in U. fissa reach up to 6.2% (fresh weight). The essential amino acids (EAA) in U. fissa were complete, accounting for 41.69% in total amino acid. The close degree of protein in U. fissa is 0.8667, the score of ratio coefficient of amino acid is 62.53. The first limited amino acid is sulfur-containing amino acids, Methionine and Cysteine. The content of mercury (Hg), lead (Pb) and arsenic (As) in U. fissa did not exceed the standards of limited gauge of the vegetable. Therefore, it suggested that U. fissa can serve as a safe wild vegetable.