▎ 摘　　要

NOVELTY - A graphene-based hemoglobin sensor electrode preparing method involves preparing a graphene modified electrode. The graphene oxide prepared by the chemical oxidation method is dispersed in a phosphate buffer solution to form a stable dispersion liquid, and the dispersed droplets are applied onto the cleaned glassy carbon electrode, and the graphene oxide-modified electrode is dried at room temperature. Reduction of graphene oxide is performed on the modified electrode. The modified electrode is utilized as a working electrode in a phosphate buffer solution having molar concentration of 0.05-0.2 M, and three-electrode system is formed with a saturated calomel reference electrode and platinum plate counter electrode followed by performing cyclic voltammetry scanning at -1.5 to 0 voltage that reduces graphene oxide to graphene, improving conductivity of electrode and the adsorption performance of hemoglobin, and promoting direct electrochemical reaction between hemoglobin and electrode. USE - Method for preparing graphene-based hemoglobin sensor electrode that is utilized for detecting hemoglobin in feces, and urine (claimed), and screening fecal occult blood in patients with suspected gastrointestinal malignancies. ADVANTAGE - The biosensor has high sensitivity, better stability, wide linear range and strong anti-interference ability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a for use of graphene-based hemoglobin sensor electrode for detecting hemoglobin in feces, and urine.