Electrochemical Study of the Complexation of Quercetin with Lead (׀׀ ) ion in acidic media

Abstract

Dietry flavonoids(Poly phenols) are important  phytonutrient component widely distributed in plant foods , flavonoids have beneficial biological activities,such as antioxidant activity , flavonoids can chelate with metal ions , the interaction of lead(׀׀) ion with a  poly hydroxylated flavonoids, the quercetin molecule,were investigated electrochemically in acidic media .The Differential Puls Polarographic  Techanique  was used to determine the kinetics parameters (K^ס f,h ,   αn) using Meites- Israel method, also thermodynamic parameters such as enthalpy change (∆H), free energy chang (∆G) , entropy change(∆S) of  Pb⁺² – complexes with  Quercetin at (293- 313k) . The(K^סf,h, αn)values for the  kinetics of the electrode processes show that the electrode processes were irreversible and diffusion controlled.