血红蛋白修饰粉末微电极的电化学行为及其在NO检测中的应用

Electrochemical Behaviours of Hemoglobin-DDAB-Modified Powder Microelectrode and the Application of the Powder Microelectrode in Determination of Nitric Oxide

制备并研究了使用表面活性剂DDAB和血红蛋白(Hb)修饰的粉末微电极(DDAB Hb PME)的电化学行为.结果表明,Hb于该修饰电极表面的表观载量较之文献报道提高了近3个数量级.在DDAB Hb PME电极上,Hb的氧化/还原过程转移的质子数为1.NO能在DDAB Hb PME电极表面富集,利用DDAB Hb PME电极检测溶液中的NO,可以明显提高电极的输出性能,测量灵敏度为3.1mA/μmol·L-1cm2,明显大于文献报道值(0.001～0.02mA/μmol·L-1·cm2).相应的线性检测范围为9～100nmol·L-1,检测下限达到9nmol·L-1,并可完全消除溶液中共存的抗坏血酸和尿酸对检测的干扰.

The electrochemical behaviours of DDAB-Hb-PME were studied in this paper. The (apparent) surface concentration of Hb was enhanced greatly by using the powder microelectrode (technique). NO reacts with Hb and absorbs on the surface of the modified carbon powder. Therefore, the output of the electrode was enhanced greatly by employing PME with higher reaction surface (area). The sensitivity of DDAB-Hb-PME is 3.1 mA/μmol·L^(-1)·cm^(2), which is much larger than the values obtained with the traditional electrodes. The detection limit is 9 nmol·L^(-1) and the linear response range is 9～100 nmol·L^(-1).