Spectrophotometric and electrochemical determination of the formation constants of the complexes Curcumin-Fe(Ill)-water and Curcumin-Fe(II)-water
Spectrophotometric and electrochemical determination of the formation constants of the complexes Curcumin-Fe(Ill)-water and Curcumin-Fe(II)-water
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DOI：
10.1016/s1386-1425(03)00344-5
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发表时间：
2004-04-01
影响因子：
4.4
通讯作者：
Rojas-Hernández, A
中科院分区：
文献类型：
--
作者：
Bernabé-Pineda, M;Ramírez-Silva, MT;Rojas-Hernández, A
用紫外可见分光光度法和循环伏安法研究了姜黄素与Fe（III）、Fe（II）在pH 5-11范围内形成络合物的过程。当姜黄素和碱性介质中存在的离子之间发生反应时，姜黄素-Fe（III）和姜黄素-Fe（II）系统的所得光谱呈现出类似的行为。在碱性介质中的循环伏安曲线表明，姜黄素与Fe（111）发生了化学反应，形成配合物。SQUAD数据处理允许计算姜黄素-Fe（III）配合物的形成常数，对应于物种FeCur（log beta（110）= 22.25 +/- 0.03）和FeCur（OH）（-）（log beta（11-1）= 12.14 +/- 0.03），姜黄素-Fe（II）配合物中FeCur（-）的形成常数（log beta（110）= 9.20 +/- 0.04）、FeHCur（log beta（111）= 19.76 +/- 0.03）、FeH（2）Cur（+）（log beta（112）= 28.11 +/- 0.02）。(C)2003 Elsevier B. V.保留所有权利。
The formation of complexes among the Curcumin, Fe(III) and Fe(II) was studied in aqueous media within the 5-11 pH range by means of UV-Vis spectrophotometry and cyclic voltammetry. When the reaction between the Curcumin and the ions present in basic media took place, the resulting spectra of the systems Curcumin-Fe(III) and Curcumin-Fe(II) presented a similar behaviour. The cyclic voltammograms in basic media indicated that a chemical reaction has taken place between the Curcumin and Fe(111) before that of the formation of complexes. Data processing with SQUAD permitted to calculate the formation constants of the complexes Curcumin-Fe(III), corresponding to the species FeCur (log beta(110) = 22.25 +/- 0.03) and FeCur(OH)(-) (log beta(11-1) = 12.14 +/- 0.03), while for the complexes Curcumin-Fe(II) the corresponding formation constants of the species FeCur(-) (log beta(110) = 9.20 +/- 0.04), FeHCur (logbeta(111) = 19.76 +/- 0.03), FeH(2)Cur(+) (log beta(112) = 28.11 +/- 0.02). (C) 2003 Elsevier B.V. All rights reserved.