同位素 ›› 2010, Vol. 23 ›› Issue (2): 93-97.DOI: 10.7538/tws.2010.23.02.0093

• 放射性同位素应用技术 • 上一篇    下一篇

小白菜和空心菜体内125I赋存形态探讨及含量分析

李锋1;严爱兰1;翁焕新2   

  1. 1. 浙江省杭州市农业科学研究院 实验中心,浙江 杭州310024;2. 浙江大学环境与生物地球化学研究所,浙江 杭州310027
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-05-20 发布日期:2010-05-20

Chemical Species and Content Analysis of 125I in Bok-choy and Ipomoea Aquatica Forsk

LI Feng1; YAN Ai-lan1; WENG Huan-xin2   

  1. 1. Hangzhou Academy of Agricultural Sciences, Hangzhou 310024, China;2. Institute of Environment & Biogeochemistry, Zhejiang University, Hangzhou 310027, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-05-20 Published:2010-05-20

摘要: 利用放射性125I初步分析了外源无机碘被小白菜和空心菜吸收后在植物体内的形态分布及相对含量,探讨通过培育含碘蔬菜,实现人体自然补充碘的可行性。通过对125I的碘化物的检测,结果显示,碘在小白菜和空心菜中以无机碘、有机碘以及残态碘共存。在小白菜植株体内,无机碘含量最高,占总碘量的42.48%,有机碘占7.91%,其余为残态碘;在空心菜植株体内,残态碘、无机碘和有机碘量占总碘量依次为64.97%、28.36%和6.66%。小白菜和空心菜中,无机碘主要以I-、IO3-和I2形式存在,以I-为主;有机结合碘主要以蛋白质结合碘为主,小白菜体内蛋白质结合碘占总碘的22.43%,而空心菜体内蛋白质结合碘占总碘的8.68%;核酸结合碘含量其次,多糖结合碘量最少,分别为0.78%和0.40%。以上结果表明,小白菜和空心菜可以富集环境中的碘,可以作为含碘蔬菜进行培育。

关键词: 125I, 赋存形态, 小白菜, 空心菜

Abstract: Iodine has been long known as an indispensable element in the synthesis of thyroid hormones. Severe iodine deficiency in diet leads to iodine deficiency disorders in humans. An isotope tracer experiment was carried out to study the chemical species and content analysis of 125I absorbed by the Bok -choy and Ipomoea Aquatica Forsk. The results showed that inorganic 125I, organic 125I and residual 125I have been detected in Bok -choy and Ipomoea Aquatica Forsk. In Bok-choy, the inorganic 125I content is the most which up to 42.48%, and except for residual 125I the organic 125I content is taken up to 7.91%. But in Ipomoea Aquatica Forsk, the content of 125I ranks as residual 125I > the inorganic 125I > organic 125I followed by 64.97%, 28.36% and 6.66%. The consists of inorganic 125I is I-,IO3- and I2 in both Bok -choy and Ipomoea Aquatica Forsk,and I- is the main chemical species. The protein-125I was the main form of organic iodine which respectively amounts to 22.43% and 8.68% of total iodine, the content of amylose-125I was the least which was 0.78% and 0.40% in both Bok-choy and Ipomoea Aquatica Forsk, and the content of the nucleic acid-125I is between them. The results showed that Bok -choy and Ipomoea Aquatica Forsk can enriched Iodinein environment. so, they could be cultivated as iodine vegetable.

Key words: 125I, chemical species, Bok–choy, Ipomoea Aquatica Forsk