【正文】
學 院: 專 業(yè): 姓 名: 指導教師: 完成日期: I 摘 要 重金屬是我們熟知的環(huán)境污染物之一 , 近些年 , 工礦業(yè)的發(fā)展,農(nóng)藥、 化肥的使用 , 使得重金屬對水體,土壤的污染愈來愈嚴重,而在植物的器官中累積的重金屬 ,最終經(jīng)過食物鏈 迫害人類。 利用植物減輕重金屬污染是國內(nèi)外研究開發(fā)的熱點。其中, 進入體內(nèi) 的1/3 的鎘 可被 腎臟 吸收, 腎臟 是鎘中毒的靶器官。鎘在體內(nèi)可與含 氨基、 羥基、硫基的蛋白 質(zhì)分子結(jié)合, 抑制 許多酶系統(tǒng) ,從而 使 肝、腎器官中酶系統(tǒng)的 正常功能 受阻 。 更嚴重的會使 使骨骼的代謝受阻,造成骨質(zhì)疏松、萎縮 等一系列癥狀 ,鎘的危害已經(jīng)受到人們極大地 關(guān)注 。以在不同重金屬鉻的環(huán)境下生長的花生為原料,利用高效液相色譜 質(zhì)譜聯(lián)用儀來測定花生中植物螯合肽的含量。在以上的實驗條件下 , 檢出限 為 ; 線性范圍分布在 ( R2=)之間,回收率在 80% 以上,靈敏度相對較高。結(jié)果表明, 重金屬鎘污染的花生中都檢出不同濃度的植物螯合肽。 關(guān)鍵字 : 鎘污染 ; 花生 ; 植物螯合肽( PC) ; 高效液相色譜 質(zhì)譜 II Abstract heavy metals is known as one of environmental pollutants, in recent years, the development of industrials, the use of pesticides, fertilizers, makes the heavy metals in the aquatic and soil pollution bees more and more serious, and heavy metals are accumulated in the plant ans, the finally, human is persecuted by heavy metals through the food chain. Using plants to reduce heavy metal pollution is a hotspot of research and development at home and abroad. The study found that cadmium absorbed by the body will turn into cadmium sulfide protein, cadmium sulfide is a selective protein, can be accumulated in kidney, a third of the cadmium can be absorbed by the kidney, the kidney is the target an of cadmium poisoning. Other ans such as pancreas, spleen, thyroid gland and hair also be accumulated a certain amount. Cadmium in the body will be united by protein molecules containing amino, hydroxyl, inhibition of many enzyme system, so that the normal function of the liver and kidney ans in enzyme system will be damaged. Due to the cadmium, the patient can appear the symptom of diabetes, protein and amino acid urine, More seriously, which can make bone metabolism, cause osteoporosis, contraction and a series of symptoms, the harm of cadmium has been greatly concerned. In this study, Chelating peptide content in plants was used as an index, which explored the influence that different concentrations of cadmium induced the content of peanut plant chelating peptide, the study use peanuts grown in different heavy metal chromium as raw material and take advantage of high performance liquid chromatographymass spectrometry instrument to determine the content of peanut plant in chelating peptide. This experiment took advantage of reversed phase column C, acetonitrile and % trifluoroacetic acid, which detected the chelating peptide content of peanut under The induced of different concentrations of cadmium. In the above experimental conditions, the detection limit was mg/L。 Peanuts。 High performance liquid chromatography mass spectrometry 目 錄 序言 ................................. ............................. .. .. 1 植物螯合肽 ( PC)的簡介 ......................................... .. . 1 植物螯合肽 ( PC)的合成 ......... ................................... 1 PC 對重金屬的解毒作用 .................... ...................... .. 3 第 1 章 實驗材料及實驗方法 ...................................... . .. 5 實驗材料、試劑及儀器 ................................. ............. 5 實驗方法 ......................................................... 5 第 2 章 實驗結(jié)果與分討論 ............................... ........... .. 7 PC標準樣品混合物的色譜分離 ........................................ 7 鎘對花生體內(nèi) PC 和 GSH 含量和 PC 狀態(tài)的影響 ......................... 7 花生樣品中 PC4 的含量檢測 ........... ............................... 8 第 3 章 實驗結(jié)論 .................................................... 12 實驗結(jié)論 ........................................................ 12 研究展望 ........................... ............................. 12 參考文獻 ............................... .............................. 13 致謝 ...................................... ........... ..... ........... . 14 1 序言 植物螯合肽 ( PC)的簡介 PC 的種類 植物螯合肽( PC phytoehelatin),是在重金屬誘導下,植物通過一個富含半胱氨酸的多肽的酶催化合成的一種巰基含量特別高蛋白質(zhì)。研究表明 PC 最初是在用 200 mMol/LCdSO4 誘導蛇根木懸浮細胞時發(fā)現(xiàn)的,目前人們已經(jīng)發(fā)現(xiàn)了 5