Electrochemical biosensor based on reduced graphene oxide and Au nanoparticles entrapped in chitosan/silica sol-gel hybrid membranes for determination of dopamine and uric acid

► AuNPs and RGO were entrapped in chitosan/silica sol-gel hybrid membranes. ► Combined advantages of RGO, AuNPs and chitosan/silica sol-gel hybrid membranes. ► Enhanced electrochemical response of UA and DA. ► The biosensor has low detection limit and wide linear range.