THE EFFECT OF MONOVALENT CATIONS AND ANIONS ON THE RHEOLOGICAL PROPERTIES OF KAPPA‐CARRAGEENAN GELS1

摘要

ABSTRACTThe change in dynamic Young's modulus E' and in volume of 2 and 4 kappa‐carrageenan gels induced by immersion in alkali metal salt solutions was observed for various kinds of salts, LiCl, NaCl, KCl, CsCl, LiBr, NaBr, KBr, CsBr, Nal, KI, Csl, and for various salt concentrations. E' of the gels increased rapidly up to 1 h after immersion, and then it increased more gradually. However, E' decreased after a certain immersion time when the concentration of the salt exceeded a certain value which depended on the kind of the salt. The volume of the gel immersed in salt solutions for 24 h decreased with increasing concentration of the salt except in the case of Nal where the gel swelled remarkabl