Interaction Study of a Secondary Metabolite Quercetin with Metal ions by Conductometry and Fluorescence Spectroscopy

In this work, interaction study of metal ions with quercetin, the secondarymetabolite of plants was investigated by conductometric method and fluorescencespectroscopy. the conductometric study was done in acetonitrile solution. the conductanceof the solution is measured after each addition of the quercetin to the cation solution. thefluorescence spectrum of quercetin was recorded in presence and absence of metal ions atmaximum wave length (481 nm) upon excitation at 425 nm. among the many cations titratedwith quercetin, mg2+, al3+, pb2+ and zn2+ enhanced the intrinsic fluorescence of the quercetinwhile cu2+, ni2+ and co2+ ions quench the intrinsic fluorescence emission of the quercetinsolution. these different phenomena are observed due to the different release of absorbedenergy in formed complex. the ability of quercetin molecule to form a complex with metalions may be has an effect in quercetin anti-oxidative properties.