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The application of Brdička reaction for determination of phytochelatins in real samples of barley and thermophilic cyanobacterium grown in the presence of cadmium ions
Čížková, Petra ; Fedjuk, K. ; Šestáková, Ivana
Heavy metals represent important group of environmental contaminants. Ions of heavy metals (Cd, Pd, Cu, Hg, Zn and Ni) are released into soil solutions as a consequence of soils acidification, among others. Their presence has imminent influence on physiological procedures in plants, which have developed different mechanisms of adaptation on such conditions. One of mechanisms for plants tolerance towards heavy metal ions is their inactivation by binding on polypeptides or small proteins with high cysteine content, named phytochelatins (PC) or metallothioneins. Their function has been studied in particular at man and animals.
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The Application of Silver Amalgam Electrode in Voltammetric Determination of Cd, Pb and Cu in Reference Materials of Plant Origin
Čížková, P. ; Šestáková, Ivana ; Josypčuk, Bohdan
Silver solid amalgam electrode, combined with PC-controlled regeneration of its surface, was successful in voltammetric analysis of Cd, Pb and Cu in certified reference materials BCR (Rye Gras) , 679 White Cabbage and other two candidate materials. Results were compared and statistically evaluated with those obtained by voltammetry on HMDE and ETA-AAS determination. Silver solid amalgam electrode, combined with PC-controlled regeneration of its surface, was successful in voltammetric analysis of Cd, Pb and Cu in certified reference materials BCR (Rye Gras) , 679 White Cabbage and other two candidate materials. Results were compared and statistically evaluated with those obtained by voltammetry on HMDE and ETA-AAS determination.
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Phytochelatins as Cadmium and Zinc Ligands in Study Using Voltammetric Methods
Šestáková, Ivana ; Navrátil, Tomáš
Complexation of synthetically prepared phytochelatin PC3 was studied using differential pulse voltammetry on HMDE. This method allows to measure reduction peak of mercury compound of original peptide simultaneously with the reduction peaks of formed cadmium or zinc complexes. Elimination voltammetry with linear scan was used at selected stoichiometric ratio to characterise diffusion current of complexes formed. Substantial differences were found between Cd and Zn complexes, both in formation and behaviour.
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