Multi-walled carbon nanotube-chitosan/poly(amidoamine)/DNA nanocomposite modified gold electrode for determination of dopamine and uric acid under coexistence of ascorbic acid

► A nanocomposite of MWNT-Chit/PAMAM/DNA modified Au electrode was fabricated. ► It was applied to detect DA and UA in the presence of AA. ► It exhibited strong catalytic activity toward the oxidation of DA and UA. ► It was highly sensitive with detection limit of 0.03 μM DA and 0.07 μM UA. ► It surface reproducibility was satisfactory, and it has a long-term stability.