Multinuclear NMR study on the sol-gel transition of aqueous κ-and λ-carrageenan solutions: Selective site binding of group I cations

Masahiko Annaka, Kiriko Suzuki, Ryoko Takahashi, Takayuki Nakahira, Masayuki Tokita, Hiroaki Utsumi, Hiroko Seki

Research output: Contribution to journalArticle


Multinuclear NMR study was carried out to study the interaction between group I cations (Na+, K+, Rb+ and Cs+) and κ- and λ-carrageenans. κ- and λ-carrageenans showed a marked difference in their physical properties, particularly in their gel-forming ability. Unlike aqueous λ-carrageenan solution, the gelation of κ- carrageenan produces highly selective binding sites for alkali metal ions, in which Rb+, K+ and Cs+ ions bind more strongly than Na+. The alkali metal NMR suggests the occurrence of selective site binding of ions to form the cross-linking domains in κ-carrageenan.

Original languageEnglish
Pages (from-to)4094-4099
Number of pages6
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number7 A
Publication statusPublished - Dec 1 2000


All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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