8-aminoquinoline functionalized graphene oxide for simultaneous determination of guanine and adenine

The nanocomposite graphene oxide/8-aminoquinoline (GAQ) was prepared as modified electrode material for simultaneous determination of guanine and adenine. The prepared GAQ was characterized by SEM, TEM, FTIR, Raman, and UV-vis, which confirmed that the 8-aminoquinoline had been functionalized by covalent modification. The differential pulse voltammetry (DPV) proved the electrochemical properties of the GAQ, which exhibited good electrocatalytic activity and prominent synergistic effect for sensitive determination of guanine and adenine. The guanine and adenine both were detection by DPV showed good linearity with linear range covering 0.1–160 μM, and the detection limits (LOD) ( S/N  = 3) both were estimated to be 0.033 μM for guanine and adenine, respectively.