Analysis of nutrient components and nitrate safety risk of common edible stemmy and leafy vegetables in Shanghai
In this study,14 common stemmy and leafy vegetables(including Brassica chinensis L.,Brassica campestris L.ssp.Pekinensis,Cichorium intybus Linn.,Medicago sativa L.,Allium tuberosum Rottler ex Spreng.,Apium graveolens var.dulce(Mill.)Pers.,Brassica rapa var.glabra Regel,Brassica oleracea var.capitata L.,Lactuca sativa var.ramosa Hort,Amaranthus lividus L.,Glebionis coronaria L.,Ipomoea aquatica Forsk,Gynura cusimbua(D.Don)S.Moore and Lactuca sativa var.asparagina)commercially available in Shanghai and 2 uncommon leafy vegetables(Japanese woad and Meristotheca papulosa Mont.)were analyzed on the contents of water,vitamin C,protein,and soluble sugar,as well as the nitrate content for evaluating the safety risk level.The leafy vegetables,capable of nitrate accumulation,are the major vegetables consumed by residents in Shanghai.The results showed that among the 16 tested vegetables,Glebionis coronaria L.and Medicago polymorpha L.had the highest and the lowest contents of water respectively,while Medicago polymorpha L.with highest contents of vitamin C and protein,and cabbage with highest content of soluble sugar.Chinese cabbage had the lowest nitrate content,while red amaranth had the highest.Within the 2 uncommon vegetables,Meristotheca papulosa Mont.had relatively balanced nutrient contents and less accumulations of nitrate,indicating the potential for cultivation in Shanghai to accelerate the local"Vegetable Basket Program".Overall,none of the 16 stemmy and leafy vegetables exhibited nitrate contaminaton at seriouly harmful levels,thus the nitrete content in stemmy and leafy vegetables consumed by Shanghai residents has remained at a relatively safe level.
commercially availablestemmy and leafy vegetablesnutrient componentsafety
万方数据
维普
