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- W2058634181 abstract "E.p.r. spectroscopy and copper potentiometry indicated the stepwise formation of copper-galacturonate complexes, with successive formation constants log K1 ∼2.16 and log K2 ∼2.06. Comparison of the magnetic parameters g| of these complexes (2.403 ± 0.003 and 2.380 ± 0.003, respectively) with those of copper complexes formed with pectins of various origins (2.390 ±0.003) showed that weaker bonds were formed with the polymers than with the monomers. The greater affinity of copper for the polymers is therefore due mainly to entropic effects. The presence of aquo-complexes in frozen solutions, easily detectable by e.p.r. spectroscopy, was observed, for all the pectins studied, when the metal-to-ligand ratio (N) was >0.5. The increase in line-width with N, up to N ∼0.5, was more important with unesterified pectins (∼200%) than with esterified pectins (∼40%)." @default.
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- W2058634181 date "1987-12-01" @default.
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- W2058634181 title "An E.P.R. and potentiometric study of the complexation of copper ions by galacturonic acid and galacturonans" @default.
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- W2058634181 doi "https://doi.org/10.1016/s0008-6215(00)90900-5" @default.
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