中文摘要：

以4-氨基丁酸（4-ABA）为修饰剂，制备了4-ABA修饰碳纳米管掺杂碳糊电极（P-4-ABA／CNTPE），研究了多巴胺（DA）在此修饰电极上的电化学行为，并用于DA的检测。在pH2．0的BR缓冲溶液中，DA在P-4-ABA／CNTPE上产生一对灵敏的氧化还原峰。其氧化峰电流与DA的浓度在8．0×10^-5mol／L～5．3×10^-7mol／L范围内呈良好的线性关系，检测限为2．0×10^-7mol／L。所修饰电极具有较好的重现性、稳定性，对抗坏血酸（AA）和尿酸（UA）具有较好的抗干扰能力。应用于针剂以及人体实际尿样中多巴胺含量的测定，结果令人满意。

英文摘要：

Poly 4-aminobutyric acid modified carbon nanotube-doped carbon paste electrode（P-4-ABA/CNTPE）was constructed by electropolymerizing 4-ABA. Voltammetrie behavior of dopamine （DA） was investigated at the modified electrode. In Britton-Robinson（BR） buffer solution（ pH 2.0）, DA has a pair of sensitive redox peak at the modified electrode, and the oxidation peak current was linearly increased with the concentration of DA in the range of 8.0 × 10-5 mol/L-5.3×10-7 mol/L,with a detection limit of 2.0×10-7 mol/L. The modified electrode exhibited good repeatability, stability and avoided the interference of aseorbic acid （AA） and uric acid （UA）. This method was used for the determination of DA in a DA hydrochloride injection and human urine samples with satisfactory results.