Alberich Arístides, Ariño Cristina, Díaz-Cruz José Manuel, Esteban Miquel
Departament de Química Analítica, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain.
Talanta. 2007 Jan 15;71(1):344-52. doi: 10.1016/j.talanta.2006.04.006. Epub 2006 May 26.
A differential pulse polarographic (DPP) study of the Pb(2+)/Cys-Gly, Pb(2+)/gamma-Glu-Cys, Pb(2+)/PC(2) and Pb(2+)/PC(3) systems is performed, being PC(2) and PC(3) the phytochelatins of general structure (gamma-Glu-Cys)(n)-Gly, with n=2 and 3, respectively. Analysis of DPP data is assisted by multivariate curve resolution with alternating least squares (MCR-ALS) method in order to establish the complexes formation sequence and their final stoichiometries. DPP signals of these systems present, besides overlapping of peaks due to free metal ion and metal complexes, interference of mercury anodic signals. Despite these complications, MCR-ALS allows us to propose a model of complexation for each system, and some tentative structures for the complexes.
对Pb(2+)/半胱氨酸 - 甘氨酸、Pb(2+)/γ-谷氨酰半胱氨酸、Pb(2+)/PC(2)和Pb(2+)/PC(3)体系进行了差分脉冲极谱（DPP）研究，其中PC(2)和PC(3)是一般结构为（γ-谷氨酰半胱氨酸）n - 甘氨酸的植物螯合肽，n分别为2和3。采用交替最小二乘法的多元曲线分辨（MCR - ALS）方法辅助分析DPP数据，以确定配合物的形成顺序及其最终化学计量比。这些体系的DPP信号除了存在游离金属离子和金属配合物的峰重叠外，还存在汞阳极信号的干扰。尽管存在这些复杂情况，MCR - ALS仍使我们能够为每个体系提出一个络合模型以及一些配合物的初步结构。
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