A reagentless amperometric immunosensor based on nano-au and carbon nanotubes for detection of alphafetoprotein

作者：Wu Sheng^*; Gu Xianqing; Li Jieming; Luo Kunlun

来源：African Journal of Biotechnology, 2011, 10(40): 7896-7901.

• Multi-walled carbon nanotubes (MWCNTs)
• Au nanoparticles (nano-Au)
• chitosan (CS)
• amperometric immunosensor
• alphafetoprotein (AFP)

In this paper, carboxyl-ferrocene (Fc-COOH) was explored to label alphafetoprotein antibody (anti-AFP), which was then mixed with AU nanoparticles (nano-Au) and multi-walled carbon nanotubes (MWCNTs) dispersed by chitosan (CS) to form the nano-Au/MWCNTs/anti-AFP-Fc chitosan composite. After that, the composite was immobilized onto the surface of the electrode to prepare a reagentless amperometric alphafetoprotein (AFP) immunosensor. The experimental results indicated that, the proposed immunosensor had good current response to AFP with a linear range from 0.1 to 50 ng/ml with a detection limit of 0.03 ng/ml. Moreover, the electrochemical properties and performance were investigated by the cyclic voltammetry. The results also found that, the immunosensor owned the advantages of high stability, simple preparation and operation and well regeneration performance.

• 出版日期2011-8-1