Simultaneous electrochemical determination of uric acid, xanthine and hypoxanthine based on poly(l-arginine)/graphene composite film modified electrode

► Poly(l-Arg)/ERGO modified electrode was prepared by one-step electrochemical way. ► The modified electrode was used to simultaneously determine UA, XA and HX. ► The modified electrode shows good sensitivity, selectivity and reproducibility. ► The modified electrode can determine UA, XA and HX in human urine samples.