4.7 Article

Specific binding of trivalent metal ions to λ-carrageenan

期刊

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2017.12.095

关键词

Specific binding; Carrageenan; Trivalent ions; Coordination effect; Electrostatic interaction

资金

  1. State Key Research and Development Plan modern food processing and food storage and transportation technology and equipment [2017YFD0400200]
  2. National Natural Science Foundation of China [31671811]
  3. National Ten Thousand Talents Program, Beijing Advanced Innovation Center for Food Nutrition and Human Health (Beijing Technology & Business University)
  4. Wuhan Science and Technology Bureau [2015070504020218]

向作者/读者索取更多资源

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 L-carrageenan (iota-car), the ionic binding behavior of A-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+, Fez+, 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 A-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 A-car. (C) 2017 Elsevier B.V. All rights reserved.

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