The invention discloses an
electrochemical detection method of
dopamine, and belongs to the technical field of analysis. According to the method, SnS2
quantum dots are loaded on Zn-MOF and modified on an
electrode, then gold nanoparticles and a sulfydryl-containing
dopamine aptamer single chain are sequentially fixed on the
electrode, an Apt / AuNPs / SnS2QDs (at) Zn-MOF / GCE
composite electrode (in an open state) is formed, an electrochemical
signal of the
composite electrode is greatly improved, and based on specific recognition between
dopamine and an
aptamer chain, the electrochemical performance of the
composite electrode is improved. A large cavity of Zn-MOF is used for packaging SnS2
quantum dots with excellent electrochemical properties, electrochemical
signal amplification is achieved, when a target object dopamine exists, dopamine can quench an ECL
signal, an
electric signal is obviously reduced (in a
closed state), and therefore a
linear relation between the change of the electrochemical signal and the concentration of dopamine is constructed, and the electrochemical property of the electrochemical signal is improved. Therefore, high-sensitivity and high-selectivity detection of dopamine is realized.