New voltammetric strategy for determination of dopamine in the presence of high concentrations of acetaminophen, folic acid and N-acetylcysteine

► A carbon-paste electrode is modified with 5-mino-3′,4′-dimethyl-biphenyl-2-ol. ► This electrode reduced the oxidation potential of dopamine about 170 mV. ► It resolved the voltammetric waves of dopamine, acetaminophen, folic acid and N-acetylcysteine.