Zhang Yuzhong, Cai Yuejuan, Su Shao
College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, Wuhu 241000, People's Republic of China.
Anal Biochem. 2006 Mar 15;350(2):285-91. doi: 10.1016/j.ab.2006.01.002. Epub 2006 Jan 19.
In this study, poly(styrene sulfonic acid) sodium salt/single-wall carbon nanotube film was cast onto the surface of glassy carbon electrode and the electrochemical behavior of the modified electrode was investigated. The results show that the anodic peak current is proportional to the concentration of dopamine in the range of 1.6 x 10(-8)-6 x 10(-4) M. The detection limit is 8 x 10(-9) M. The interference of ascorbic acid with the determination of dopamine could be eliminated due to the very distinct attracting interaction between dopamine cations and the negative poly(styrene sulfonic acid) sodium salt film in pH 7.0 phosphate-buffered saline solutions. The proposed method exhibits good sensitivity, selectivity, and reproducibility.
在本研究中，将聚苯乙烯磺酸钠/单壁碳纳米管薄膜浇铸在玻碳电极表面，并研究了修饰电极的电化学行为。结果表明，在1.6×10⁻⁸ - 6×10⁻⁴ M范围内，阳极峰电流与多巴胺浓度成正比。检测限为8×10⁻⁹ M。在pH 7.0的磷酸盐缓冲盐溶液中，由于多巴胺阳离子与带负电的聚苯乙烯磺酸钠薄膜之间存在非常明显的吸引相互作用，因此可以消除抗坏血酸对多巴胺测定的干扰。所提出的方法具有良好的灵敏度、选择性和重现性。
