The activity of the phenol biosensor was inhibited by benzoic acid through reversible competitive inhibition mechanism and the inhibition constant is 33 . 8 u . m . the inhibition was influenced by ph value of the determined solution and increased with decreasing ph 苯甲酸对该酚传感器有竞争性可逆抑制作用,抑制常数为33 . 8 m ;溶液ph对抑制作用有较大影响,抑制作用随着ph的降低而逐渐增强。