多壁碳纳米管/α-(2,4-二叔丁基苯氧基)酞菁钴修饰碳糊电极对L-半胱氨酸的测定  

Carbon Paste Electrode Incorporating Multi-walled Carbon Nanotube/α-(2,4-Di-tert-butylphenoxy) phthalocyan-inatocobalt for Determination of L-cysteine

作　　者：张艳君[1] 方昕[1] 王建[1] 王俊东[1] 

机构地区：[1]福州大学化学化工学院,福州350002

出　　处：《应用化学》2008年第8期909-912,共4页Chinese Journal of Applied Chemistry

基　　金：福建省科技厅资助项目(2006F5058)

摘　　要：研究了多壁碳纳米管和α-(2,4-二叔丁基苯氧基)酞菁钴修饰碳糊电极对L-半胱氨酸的电催化氧化。发现α-(2,4-二叔丁基苯氧基)酞菁钴修饰碳糊电极对L-半胱氨酸有很好的电催化作用,降低了L-半胱氨酸的阳极氧化电位。加入了多壁碳纳米管后,电极的电流信号增强,灵敏度增大。质量分数为10%多壁碳纳米管掺入α-(2,4-二叔丁基苯氧基)酞菁钴修饰碳糊电极对L-半胱氨酸的电流信号响应最强。在搅拌下测定其安培响应,稳态电流5s内达到稳定状态,灵敏度为8.44×10-2A·L/(mol·cm2),检测下限为5.0×10-6mol/L。A modified carbon paste electrode modified by multi-walled carbon nanotube and α-（2,4-Di-tertbutylphenoxy） phthalocyaninatocobalt towards the electrocatalytic oxidation of L-cysteine was studied. The α-（2,4-Di-tert-butylphenoxy ） phthalocyaninatocobalt modified carbon paste electrode showed an excellent electrocatalytic activity to L-cysteine and lowered the anodic oxidation potential. The current signal and the sensitivity were enhanced after multi-walled carbon nanotube was added to the modified electrode. A mixture of graphite powder with 10% of multi-walled carbon nanotube was applied to the preparation of carbon paste. The modified carbon paste electrode had a maximum sensitivity to current signal for L-cysteine. Amperometric response was detected in the silting solution. The steady-state current quickly reached a stable value in less than 5 s. The sensitivity of the electrode was 84. 4 nA · cm^-2/（ umol · L^-1 ）, and the limit of detection was 5.0 × 10^ -6 mol/L.

关 键 词：L-半胱氨酸 碳纳米管 α-(二叔丁基苯氧基)酞菁钴 碳糊电极 

分 类 号：O646[理学—物理化学]