CADMIUM

 ✡ Introduction

   (1)為何偵測此毒物?

   植物油有很多種製程方式，但是，來源的植物，若有接觸到汙染土壤，即可

   能含有有毒物質。[1]汙染油，或是未達標準的油，若參雜這些汙染植物，即

   會在植物油內有汙染物。其中，我們發現到，有鎘汙染的植物，在世界廣泛，

   尤其是中國，有這個問題[2]。

   另外，重複使用的汙染油，也會含有鎘金屬[3]，因此鎘金屬可以做偵測餿水

   油的好目標，本組想要來檢測鎘金屬。

   (2)此毒物的危害

   有急性、慢性中毒之分。鎘及其化合物均有一定的毒性。吸入氧化鎘的煙霧

   可產生急性中毒。中毒早期表現咽痛、咳嗽、胸悶、氣短、頭暈、噁心、全

   身痠痛、無力、發熱等症狀，嚴重者可出現中毒性肺水腫或化學性肺炎，有

   明顯的呼吸困難、胸痛、咯大量泡沫血色痰，可因急性呼吸衰竭而死亡。用

   鍍鎘的器皿調制或存放酸性食物或飲料，飲食中可能含鎘，誤食後也可引起

   急性鎘中毒。潛伏期短，通常經10～20分鐘後，即可發生噁心、嘔吐、腹

   痛、腹瀉等症狀。嚴重者伴有眩暈、大汗、虛脫、上肢感覺遲鈍、甚至出現

   抽搐、休克。一般需經3～5天才可恢復。

   長期吸入鎘可產生慢性中毒，引起腎臟損害，主要表現為尿中含大量低分子

   量蛋白質，腎小球的濾過功能雖多屬正常，但腎小管的回收功能卻減退，並

   且尿鎘的排出增加。[4]

   (3)台灣法規

   3-1: The limit of cadmium in vegetable or mushroom

   Vegetable: 0.05~0.2ppm ; mushroom: 2ppm

   3-2: The limit of cadmium in rice

   Rice: 0.4 ppm

   3-3: The limit of cadmium in oil

   There is no law to standard.

   (4)Another country`s regulations

   Due to the adverse effects on the environment and human health, the supply

   and use of cadmium is restricted in Europe under the REACH Regulation.

   The EFSA Panel on Contaminants in the Food Chain has set 2.5 μg/kg body

   weight as a tolerable weekly intake for humans. In comparison, the Joint

   FAO/WHO Expert Committee on Food Additives has established 7 μg/kg bw

   as a provisional tolerable weekly intake level.

   America:

   1. Restrict the release of cadmium to lack, river, arable land, rubbish tip.

   2. The limit of cadmium in water :10ppm

   3. The limit of cadmium in food coloring :15ppm

 ✡ Circuit Design

   Zintp K896008 is a promoter which is designed by NYMU in

   2013.It is a part highly specific to the cadmium. When

   cadmium attaches to Zintp k896008, the circuit will begins.

   And the fluorescence protein E1010/E0040 receives the

   message from zintp k896008,It will result in purple and red

   fluorescence. Finally, the terminator, B0015 will complete the

   circuit.

   我們排列組合兩個RBS(B0031,B0032)和RFP(E1010),GFP(E0040)製作四種設計

 ✡ Result

 ✡ Reference

   [1] Metal contamination of soils and crops affected by the Chenzhou lead/zinc mine spill (Hunan, China).(Liu H, Probst A, Liao B.)

   [2] High levels of heavy metals in rice (Oryza sativa L.) from a typical E-waste recycling area in southeast China and its

          potential risk to human health (Jianjie Fu, Qunfang Zhou, Jiemin Liu, Wei LiuThanh Wang,Qinghua Zhang,Guibin Jiang)

   (註3)Brown, N. L., J. V. Stoyanov, et al. (2003). "The MerR family of transcriptional regulators." FEMS Microbiol Rev 27(2-3): 145-163.

   (註4)Park, S. J., J. Wireman, et al. (1992). "Genetic analysis of the Tn21 mer operator-promoter." J Bacteriol 174(7): 2160-2171.