分光光度法和电化学法测定姜黄素 - 铁（III） - 水和姜黄素 - 铁（II） - 水配合物的形成常数
Spectrophotometric and electrochemical determination of the formation constants of the complexes Curcumin-Fe(III)-water and Curcumin-Fe(II)-water.
作者信息
Bernabé-Pineda Marganta, Ramírez-Silva Maria Teresa, Romero-Romo Mario Alberto, González-Vergara Enrique, Rojas-Hernández Alberto
机构信息
Departamento de Química, Area de Química, Analítica, Universidad Autónoma Metropolitana-Iztapalapa, San Rafel Altixco 186, Apdo Postal 55-534, C.P. 09340, México, D.F. México.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2004 Apr;60(5):1105-13. doi: 10.1016/S1386-1425(03)00344-5.
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(III) 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 (lob beta110 = 22.25 +/- 0.03) and FeCur(OH)- (log beta111 = 12.14 +/- 0.03), while for the complexes Curcumin-Fe(II) the corresponding formation constants of the species FeCur- (log beta110 = 9.20 +/- 0.04), FeHCur (log beta111 = 19.76 +/- 0.03), FeH2Cur+ (log beta112 = 28.11 +/- 0.02).
通过紫外可见分光光度法和循环伏安法，研究了姜黄素、Fe(III)和Fe(II)在5 - 11 pH范围内的水介质中形成配合物的情况。当姜黄素与碱性介质中的离子发生反应时，姜黄素 - Fe(III)和姜黄素 - Fe(II)体系的所得光谱呈现出相似的行为。碱性介质中的循环伏安图表明，在配合物形成之前，姜黄素与Fe(III)之间发生了化学反应。使用SQUAD进行数据处理，得以计算出姜黄素 - Fe(III)配合物的形成常数，对应于FeCur物种（log β110 = 22.25 ± 0.03）和FeCur(OH)-（log β111 = 12.14 ± 0.03），而对于姜黄素 - Fe(II)配合物，FeCur-物种（log β110 = 9.20 ± 0.04）、FeHCur（log β111 = 19.76 ± 0.03）、FeH2Cur+（log β112 = 28.11 ± 0.02）的相应形成常数。
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