Viscoelastic properties of alginate aqueous solutions in the presence of salts

✍ Scribed by Takayoshi Matsumoto; Kimio Mashiko

• Publisher: Wiley (John Wiley & Sons)
• Year: 1990
• Tongue: English
• Weight: 414 KB
• Volume: 29
• Category: Article
• ISSN: 0006-3525
• DOI: 10.1002/bip.360291404

✦ Synopsis

The influence of added salts on the dynamic viscoelastic properties are investigated for aqueous solutions of alginates that have various molecular weights and mannuronatel guluronate ( M / G ) ratios. The dynamic moduli of the systems increase with increasing concentration of the added salt in the low-frequency region. The effect is notable in the order of KC1 < NaCl < MgCl, < CaC12. The values of the dynamic moduli in the rubbery plateau are independent of the addition of the salts, irrespective of the M / G ratio of the alginate. These facts strongly suggest that the structure that is formed by the interaction between the alginates and the metal ions does not work as cross-linking points but as heterogeneous relaxation units having a relatively long relaxation time from a rheological viewpoint.