%0 Journal Article %T Specific binding of trivalent metal ions to λ -carrageenan %+ School of Biological Engineering and Food Science [Hubei] %+ Beijing Advanced Innovation Center for Food Nutrition and Human Health %+ Hubei Collaborative Innovation Centre for Industrial Fermentation %+ Procédés Alimentaires et Physico-Chimie (PAPC) %A Cao, Yiping %A Li, Shugang %A Fang, Yapeng %A Nishinari, Katsuyoshi %A Phillips, Glyn %A Lerbret, Adrien %A Assifaoui, Ali %< avec comité de lecture %@ 0141-8130 %J International Journal of Biological Macromolecules %I Elsevier %V 109 %P 350 - 356 %8 2018-04 %D 2018 %R 10.1016/j.ijbiomac.2017.12.095 %K Electrostatic interaction %K Trivalent ions %K Coordination effect %K Carrageenan %K Specific binding %Z Life Sciences [q-bio]/Biochemistry, Molecular BiologyJournal articles %X Carrageenans are a family of sulphated cell wall polysaccharides extracted from seaweeds and are widely used in different industrial sectors. Relative to kappa-carrageenan (kappa-car) and iota-carrageenan (iota-car), the ionic binding behavior of lambda-carrageenan (lambda-car) is far less studied. In this work, the interaction and binding behavior between lambda-car and metal ions of different valency (Na+, K+, Mg2+, Ca2+, Fe2+, Fe3+, Al3+, Cr3+) have been investigated. In contrast to the non-specific interaction of the monovalent and divalent cations, specific binding has been identified between lambda-car and Fe3+/Al3+. The specific binding could lead to either precipitation or gelation of lambda-car, depending on the way of introducing Fe3+/Al3+ ions. Fe3+ and Al3+ exhibit the same binding stoichiometry of [M3+]/[repeating unit] = 1.0, with the former having a relatively larger binding constant. Cr3+, though having very similar physical properties with Fe3+/Al3+, is incapable of binding specifically to Cr3+. The phenomena could not be interpreted in terms of counterion condensation, and are rather attributable to a mechanism in which hexa-coordination of Fe3+/Al3+ and entropy-driven cation dehydration play crucial roles in driving the binding of the trivalent metal ions to lambda-car. %G English %L hal-01690195 %U https://u-bourgogne.hal.science/hal-01690195 %~ UNIV-BOURGOGNE %~ PAM %~ AGREENIUM %~ AGROSUP-DIJON %~ INSTITUT-AGRO-DIJON %~ INSTITUT-AGRO-DIJON-PAM %~ INSTITUT-AGRO-PAM %~ INSTITUT-AGRO