“…This is because they tend to coexist in biological systems on the one hand, and on the other hand, their abnormal levels would lead to various diseases. [1][2][3][4][5] Therefore, it is highly desirable to explore sensitive and selective analytical techniques for the simultaneous quantification of DA, AA and UA to gain insight into healthcare and clinical diagnostics. Since they are electrochemically active, an electrochemical method has been generally developed as an affordable and reliable tool to simultaneously detect a variety of biochemicals owing to its remarkable advantages of fast response, high sensitivity, and no requirement for any expensive equipment and complicated procedure.…”