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[目的]为人们安全食用叶下珠提供科学依据。[方法]利用分光光度计法对不同生长发育阶段叶下珠中硝酸盐、亚硝酸盐和维生素C的含量进行测定。[结果]除初花期以外,叶下珠的硝酸盐含量低于轻度污染水平(432 mg/kg鲜重),亚硝酸盐含量低于无公害蔬菜亚硝酸盐含量的限量标准(≤4.0 mg/kg鲜重),初花期叶下珠硝酸盐含量高于432 mg/kg且低于785 mg/kg,属于中度污染水平,亚硝酸盐含量低于无公害蔬菜亚硝酸盐含量的限量标准。各期的叶下珠中维生素C的含量都高于50 mg/100 g鲜重,属于高维生素C含量的野菜。[结论]根据国内外现行硝酸盐、亚硝酸盐污染标准,除初花期以外的各生长发育阶段属于一级野菜,可以安全食用。初花期的叶下珠属二级蔬菜范围,不宜生食,煮熟或盐渍可安全食用。
[Objective] To provide scientific basis for people’s safe consumption of Phyllanthus. [Method] The contents of nitrate, nitrite and vitamin C in Phyllanthus urinaria at different growth and development stages were determined by spectrophotometer. [Result] The nitrate content of Phyllanthus urinaria was lower than that of mild pollution (432 mg / kg fresh weight) except for the first flowering stage. The content of nitrite was lower than the limit of nitrite content of non-polluting vegetable (≤4.0 mg / kg fresh weight), the nitrate content of Phragmites australis at the first flowering stage was higher than 432 mg / kg and lower than 785 mg / kg, which was moderately polluted and the content of nitrite was lower than the limit of nitrite content of non-polluted vegetable . The contents of vitamin C in Phyllanthus urinaria during each period were higher than 50 mg / 100 g fresh weight, belonging to the wild vegetable with high vitamin C content. [Conclusion] According to the current standards of nitrate and nitrite pollution at home and abroad, all growth and development stages except early flowering stage belonged to first-class wild vegetables and could be safely consumed. Phyllanthus early flowering is a secondary vegetable range, raw food should not be cooked or salted safe to eat.