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標題: 以黏粒修飾電極法對鳥糞嘌呤偵測之研究
Electroanalysis of Guanine Using Clay-modified Electrodes
作者: 方琬淳
Fang, Wan- Chung
關鍵字: Clay-modified Electrodes;黏粒修飾電極;Guanine;Electroanalysis;鳥糞嘌呤;電分析化學
出版社: 土壤環境科學系所
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去氧核醣核酸是土壤微生物細胞的主要核心,而對去氧核醣核酸之偵測能反映出土壤微生物的特性。鳥糞嘌呤是去氧核醣核酸中最能表現出電化學特性的成分,故利用黏粒修飾電極偵測鳥糞嘌呤期望將來可應用於土壤微生物特性上的探討為本實驗研究之目的。本實驗研究使用環盤印刷電極搭配不同種類的黏土礦物,利用不同修飾方法所製成之黏粒修飾電極對鳥糞嘌呤偵測之探討。試驗結果指出,以Ru(bpy)32+ 與Nafion混合後修飾在黏粒電極上,對鳥糞嘌呤偵測之效果最好,且以流動注入系統在+1.2 V或是+1.0 V電位對不同濃度的鳥糞嘌呤偵測之穩定性效果很好。以此電極對( 50 μΜ– 1000 μM )鳥糞嘌呤之偵測,有一良好的線性關係(R2 > 0.990)。由三種黏粒修飾電極對鳥糞嘌呤的偵測效果可發現,高嶺石所製備的黏粒修飾電極在電流訊號值上為最大,此與鳥糞嘌呤氧化作用及吸附情形有關。在pH 7的背景環境中,鳥糞嘌呤的吸附主要發生於黏粒的破裂邊緣,故擁有較多邊緣電荷的高嶺石在對於鳥糞嘌呤偵測上具有最好效果。選用高嶺石修飾電極對已知鳥糞嘌呤濃度之去氧核醣核酸標準品作偵測,所測得之回收率高達90%以上,顯示此黏粒修飾電極對於鳥糞嘌呤之偵測,不僅可達到便利與快速之目的外,同時其提高往後對於菌種DNA偵測上的發展性,相對上也增加對土壤微生物特性上探討的視野。

Deoxyribonucleic acid is the nucleus of soil microorganism's cell and the characteristic of soil microorganism can be identified by determining deoxyribonucleic acid. Guanine is a better electrochemical componment of deoxyribonucleic acid. The experimental is that determination of guanine using clay-modified electrode method can be applied on study of soil microorganism character. Guanine was determined by ring-disk electrode modified with different clay minerals and methods. The results indicated clay-modified electrode mofdified with mixture of Ru(bpy)32+ and Nafion had better determination for guanine and the stability of determination in different concentration of guanine are good at +1.2 V and +1.0 V, that also had a good line calibration curve (R2 > 0.990) in (50 μΜ - 1000 μM) . The result of determining guanine using three clay-modified electrodes and showed KGa-1 modified electrode had the best peak currents, due to oxidation and adsorption of guanine on clay mineral. At background solution of pH 7, guanine was adsorbed on broken edge. Kaolinite with more variable charge resulted in good determination for guanine. Recovery of guanine in standard deoxyribonucleic acid determined by KGa-1 modified electrode was 90%. In conclusion, the method of determining for guanine using clay-modified electrode could provided a fast, convenient, and economic determination for guanine, and that exhibited high potential for determination of DNA and identification of soil microorganism's character.
其他識別: U0005-2508200800392100
Appears in Collections:土壤環境科學系

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