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Properties of k-carrageenan complexes with paramagnetic transition metal cations [Co(II), Cu(II), Fe(III), Mn(II), and Ni(II)] were evaluated using the EPR spectrometry, conductivity measurements, thermogravimetric (TG), and differential scanning calorimetric (DSC) studies as well as computations with involvement of the ZINDO-1 method. The formation of the Werner-type complexes with metal central atom and polysaccharide as the ligand was proven. Ligation of the central atom involved lone electron pairs of the polysaccharide hydroxyl groups and the SO₃^- groups of carragenan.

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Complexes of anionic polysaccharides with metal salts. Part II. κ-Carrageenan

Abstract