TITLE

Comparison of differential pulse and alternating current polarography in the soft-modelling study of the complexation of Cd(II) by the fragment Cys-Gly and by the phytochelatin (γ-Glu-Cys)2Gly

AUTHOR(S)
Garrigosa, Anna Maria; Ariño, Cristina; Díaz-Cruz, José Manuel; Esteban, Miquel
PUB. DATE
July 2008
SOURCE
Analytical & Bioanalytical Chemistry;Jul2008, Vol. 391 Issue 6, p2209
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A comparison of a differential pulse polarographic with a phase sensitive alternating current polarographic study of the Cd-Cys-Gly and Cd-PC2 systems [PC2 being a phytochelatin of general structure (γ-Glu-Cys) n -Gly, with n = 2] has been performed. The chemometric multivariate curve resolution method with alternating least squares was applied in the experimental data analysis. The results obtained by both polarographic techniques have made it possible to find out the formation sequences of the complexes and their final stoichiometries. The alternating current polarograms compared with the differential pulse ones show some differences (a new signal and an important shift of peak potentials), which anyway are consistent with some of the conclusions obtained by differential pulse polarography. This fact implies that although the alternating current polarography results need some corrections before data treatment, they provide extra information that complements the conclusions achieved by differential pulse polarography. [Figure not available: see fulltext.]
ACCESSION #
32785872

 

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