▎ 摘　　要

NOVELTY - The method involves preparing graphene oxide dispersion liquid in a punch. L-cysteine standard solution is mixed with fluorescence probe solution under room temperature at different concentrations. Graphene oxide dispersion liquid is added with buffer solution, and a transmission spectrum is formed with a complementary chain. A standard curve is obtained according to sample solution, and a measuring instrument is provided with a fluorescence spectrophotometer. USE - Fluorescence detecting method. ADVANTAGE - The method enables improving sensitivity and selectivity and reducing interference. DESCRIPTION OF DRAWING(S) - The drawing shows a graphical representation of a fluorescence detecting method.