Binding of lead and copper(II) ions to starch and amylose 2,3-dicarboxy derivatives

Autor:	Rudolf Kohn, Karol Tihlárik
Rok vydání:	1986
Předmět:	chemistry.chemical_classification chemistry.chemical_compound chemistry Biochemistry Amylose Starch chemistry.chemical_element General Chemistry Counterion Copper Ion Nuclear chemistry
Zdroj:	Collection of Czechoslovak Chemical Communications. 51:1160-1169
ISSN:	1212-6950 0010-0765
Popis:	The binding of Pb2+ and Cu2+ ions to starch and amylose 2,3-dicarboxy derivatives of degrees of oxidation DO = 0.09-0.74 was investigated. The interaction of the metal cations with the carboxy groups of the derivatives was evaluated in terms of the counter-ion activity, determined with ion specific electrodes. The binding is very strong; at DO ≥ 0.34, lead ions are bound quantitatively ( degree of association β = 0.999), copper ions are also bound to a great extent (β = 0.94-0.97). The complexation of copper with the ligands at ionic strength I = 0.15 mol 1-1 was treated in terms of multiple equilibria theory. Different complexes were found in dependence on the concentration ratios of the reactants; at a high excess of COO- groups with respect to Cu2+ ions, the latter are strongly bound and the number of COO- groups binding a Cu2+ cation is greater than 2, whereas at a sufficiently high concentration of Cu2+ ions the number of COO- groups binding a Cu2+ cation approaches the stoichiometric value of 2.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::71bafc4d96c335f90e2442e8a8ff0a3f https://doi.org/10.1135/cccc19861160 Zobrazit plný text záznamu