▎ 摘　　要

Graphene was an ideal material for various applications including electrochemical sensing. To improve the selectivity of graphene-based sensors, preparation of composites of graphene is an effective way. In this work, films of polyarginine/reduced graphene oxide were in-situ formed on the surface of the electrode and used as an electrochemical sensor of puerarin. The films were systematically characterized and the established sensor gave a linear response range from 2.3 x 10(-7) to 5.5 x 10(-6) mol.L-1 and a limit of detection of 4.0 x 10(-8) mol.L-1. The sensor was successfully applied for measuring puerarin in dietary supplements with a relative standard deviation of 2.4% and a standard recovery of 96.5%.