▎ 摘　　要

In this paper, an ultra-sensitive glassy carbon electrode modified with beta-cyclodextrin and graphene oxide (beta-CD-GO/GCE) has been prepared for the detection of biomolecules [ascorbic acid (AA), dopamine (DA) and uric acid (UA)] in aqueous solution at mu M level. The three biomolecules (AA, DA and UA) can be simultaneously detected by the modified electrodes, and the electrical signals corresponding to various biomolecules can be identified clearly in cyclic voltammetry and differential pulse voltammetry curves. The simultaneous detection limits of AA, DA, UA were 4.58, 1.56, 1.27 mu M, respectively. This ultra-sensitivity should be attributed to the formation of host-guest complexes between beta-CD and the biomolecules. Furthermore, the anti-interference experiments indicated the beta-CD-GO/GCE exhibited satisfactory selective recognition performance.