The interaction of sodium alginate with univalent cations

Hucheng Zhang, Honghe Zheng, Qingzhi Zhang, Jianji Wang, Mikio Konno

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


The M/G ratio, dyad and triad frequencies in the sodium alginate chain, were determined from 13C-nmr spectra. The interactions of sodium alginate in solution with the univalent cations K+ ion and Na+ ion have been investigated by viscometry and membrane osmometry. The dependencies of intrinsic viscosity, Huggins constant, and second virial coefficient on ionic strength were observed, and the maximums in reduced viscosity were obtained in low KCl and NaCl concentrations, respectively. These show that the electroviscous effects play an important role in polyelectrolyte solution, and the effect of the Na + ion on aqueous solution of sodium alginate is greater than the K+ ion. The experimental observations are interpreted in terms of ion-pair formation with carboxyl groups of mannuronate and isolated guluronate residues and cooperation "egg-box" binding between polyguluronate chain sequence. The difference of interaction between univalent cations and alginate chains in solution is attributed to the ability of their binding with the polyion, which depends on the properties of ions itself.

Original languageEnglish
Pages (from-to)395-402
Number of pages8
Issue number6
Publication statusPublished - 1998


  • C-nmr spectra
  • Membrane osmotic pressure
  • Polyelectrolyte
  • Second virial coefficient
  • Sodium alginate
  • Viscosity

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Biomaterials
  • Organic Chemistry


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