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Optimum Concentration of the Cd(II)-Quercetin Complexation Reaction  

Lee, Jeong-Ho (Department of Natural Health Management, Songho College)
Shin, Sun-Woo (Department of Herbal Resources, Professional Graduate School of Oriental Medicine, Wonkwang University)
Baek, Seung-Hwa (Department of Herbal Resources, Professional Graduate School of Oriental Medicine, Wonkwang University)
Publication Information
YAKHAK HOEJI / v.53, no.5, 2009 , pp. 235-240 More about this Journal
Abstract
The interaction of cadmium (II) ion with quercetin was investigated in aqueous solution at different pH. The quercetin/cadmium stochiometries for cadmium (II) binding have been determined by UV-vis spectrophotometric method. The complexation of Cd(II) ion with 54.72 ${\mu}M$ quercetin (A=1.00793) was formed in 0.2 M $NH_3-0.2$ M $NH_4Cl$ (pH 8.0) buffer solution. 1:1 Cd(II)-complex had a maximum absorbance and showed the bathochromic shift of the long-wavelength band of the UV-vis spectra in the alkaline pH when interacted with quercetin in buffer solution. These results suggest that Cd(II)-quercetin complex has the optimal condition of chelation in basic buffer solution.
Keywords
quercetin; bathochromic shift; Cd(II)-complex; UV-vis spectrophotometric method;
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