In sulphuric acid medium,the fluorescence signal of acridine red could be decreased by the oxidation of potassium bromate.In the presence of quercetin,the oxidation reaction was catalyzed,which could cause the fluorescence intensity of acridine red becoming weaker.And the reduced fluorenscence intensity was in proportion to the concentration of quercetin in a certain range.Based on this,a catalytic kinetic fluorescence method was established to detect quercetin in onion.Under the optimal conditions,the linear range for quercetin were between 0....
