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KMID : 0370220090530060342
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Yakhak Hoeji
2009 Volume.53 No. 6 p.342 ~ p.350
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Complexation Studies for Cadmium (II) with Quercetin and (+)-Catechin
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Lee Jeong-Ho
Shin Sun-Woo
Baek Seung-Hwa
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Abstract
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The interaction of cadmium (II) ion with quercetin and (+)-catechin was investigated in aqueous solution at various pH. The flavonoid/cadmium stochiometries for cadmium (II) binding to quercetin and (+)-catechin have been determined by UV-vis spectroscopy. 1 : 1 Cd (II)-Flavonoid complex had a maximum absorbance and showed the bathochromic shift of the long-wavelength band of the UV-vis spectra in the alkaline pH, that occurs upon complexation, due to a ligandto-metal charge transfer. These results suggest that Cd (II)-flavonoid complex has the optimal condition of chelation in 0.2 M NH3 - 0.2 M NH4Cl (pH 8.0) solution.
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KEYWORD
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quercetin, (+)-catechin, bathochromic shift, Cd (II)-flavonoid complex, ligand-to-metal charge transfer, UV-vis spectroscopy
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