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

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.