This invention discloses an
electrochemical detection method for
dopamine, belonging to the field of analytical technology. The method involves loading SnS2
quantum dots onto a Zn-MOF and modifying it onto an
electrode. Subsequently, gold nanoparticles and single chains containing
thiol-containing
dopamine aptamers are sequentially immobilized onto the
electrode, forming an Apt / AuNPs / SnS2QDs@Zn-MOF / GCE
composite electrode ("on" state). This significantly enhances the electrochemical
signal. Based on the specific recognition between
dopamine and the
aptamer chain, the large cavity of the Zn-MOF encapsulates the SnS2
quantum dots with excellent electrochemical properties, achieving electrochemical
signal amplification. When the target
analyte, dopamine, is present, it quenches the ECL
signal, resulting in a significant decrease in the electrochemical signal ("off" state). This establishes a
linear relationship between the change in electrochemical signal and the dopamine concentration, achieving
highly sensitive and selective detection of dopamine.