▎ 摘 要
Graphene quantum dots (GQD) could significantly enhance the chemiluminescence (CL) reaction of Ce(IV) with NaHSO3 through energy and electron transfer. The chemiluminescence resonance energy transfer (CRET) occurred between SO2*/O-1(2) and GQD, and radiative electron-hole annihilation came from the combining of the hole-injected GQD (GQD(center dot+)) and electron-injected GQD (GQD(center dot-)). Tyrosine (Tyr) is easily oxidized by OH center dot and Ce(IV), which results in the decrease of OH center dot and Ce(IV), and the CL intensity of the GQD-Ce(IV)-NaHSO3 system is inhibited by Tyr. In this way, the GQD-based CL as a sensitive and selective method was applied for the detection of Tyr in the range 0.02-8.00 mu M with the detection limit of 4.0 nM. The method was applied to the determination of Tyr in food samples with satisfactory results.