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Chelation of divalent metal ions by brown algal polyphenols
Authors:Mark A Ragan  Olav Smidsrød  Bjørn Larsen
Affiliation:Institute of Marine Biochemistry, N-7034 Trondheim-N.T.H. Norway
Abstract:High-molecular-weight, nondialyzable polyphloroglucinols from the marine brown algae Ascophyllum nodosum and Fucus vesiculosus (Phaeophyceae, Fucales) chelate the divalent metal ions Sr2+, Mg2+, Ca2+, Be2+, Mn2+, Cd2+, Co2+, Zn2+, Ni2+, Pb2+ and Cu2+ in weakly acidic aqueous solution. Values of the relative selectivity coefficients k have been calculated relative to Mn2+; the ionotropic series with the algal polyphenols are similar to those with catechol and pyrogallol. These studies may serve as a guide for the examination of metal chelation by brown algal polyphenols both in situ and after exudation into seawater.
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