▎ 摘　　要

NOVELTY - A glassy carbon electrode comprises nano compound, where the nano compound comprises copper nanoparticles, poly-dopamine, reduction-oxidation graphene, resistant blue and copper nanoparticle/poly-dopamine/reduction-oxidation graphene/resistant blue nanosized four-component complex. USE - Glassy carbon electrode for use in an electrochemical sensor for detecting creatinine content. ADVANTAGE - The glassy carbon electrode has high electrochemical activity, better biocompatibility, high sensitivity and strong anti-interference ability. The glassy carbon electrode can detect the creatinine content with high efficiency and accuracy, in simple and cost-effective manner. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a method for preparing a glassy carbon electrode (2) a glassy carbon electrode prepared by the method (3) a method for detecting creatinine (4) an electrochemical sensor.