Istituto di Biofisica     
Scarano G., Morelli E. Polarographic behavior of metal phytochelatin complexes. In: Electroanalysis, vol. 10 (1) pp. 39 - 43. Wiley, 1998.
The polarographic characteristics of metal-phytochelatin complexes (Me-PC) extracted from the marine alga Phaeodactylum tricornutum were investigated by the use of differential pulse polarography (DPP) at dropping mercury electrode (DME). Four metal-phytochelatin complexes differing for the metal bound, namely Cd-,Pb-, Zn- and Cu-PC, were studied, and their polarographic behavior was compared with that of Cd,Zn-thionein and Zn-thionein of mammalian origin. The polarographic characteristics of Me-PC exhibit a dependence on the metal bound to the peptides and on the pH of the solution. Both the organic and inorganic part of Me-PC are electroactive and give polarographic responses depending on their chemical form in solution. Dissociation and formation processes were investigated. The order of stability of the complexes was K'Cu-PC>K'Pb-PC>=K'Cd-PC>K'Zn-PC. The same electrochemical mecchanisms were found to characterize both the polarographic behavior of metallothioneins and metal-phytochelatin complexes.
DOI: 10.1002/(SICI)1521-4109(199801)10:1<39::AID-ELAN39>3.0.CO;2-X
Subject Phytochelatin
Metal-binding peptides
Heavy metals

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