Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 394, Issue 4, Pages 1137-1145Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-009-2791-z
Keywords
Plant thiols; Cadmium; Competitive binding; Multivariate curve resolution with alternating least squares; Differential pulse voltammetry; ESI-MS
Funding
- Spanish Ministerio de Ciencia e Innovacion [CTQ2006-14385-CO2-01, BES-2007-15385]
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Multivariate curve resolution with alternating least squares (MCR-ALS) has been applied to voltammetric data obtained from analysis of the competitive binding of cysteine (Cys) and cysteine-glycine (Cys-Gly) by Cd(II) as a first approach towards mixtures of phytochelatins and related compounds in natural media. From different starting points, the possibilities of formation of mixed complexes and/or displacements between ligands are investigated. Analysis of the resulting unitary voltammograms and concentration profiles of the resolved components by MCR-ALS suggests that the strongest ligand (Cys-Gly) is able to displace the weakest (Cys) from its metal complexes, whereas this does not happen in the opposite direction. On the other hand, no evidence of Cd mixed-ligand complexes was found.
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