Molecular Origin of the Rheological Characteristics of l-Carrageenan Isolated from Togekirinsai (Eucheuma serra)

摘要

The rheological properties of l-carrageenan isoalted from Togekirinsai (Eucheuma serra) were measured with a rheogoniometer. The flow curves of a Ca-salt of c-carrageenan solution showed plastic behavior and the yield value was estimated to be 0.4, 1.7 and 7.7 Pa at 0.1, 0.2 and 0.3/100 (w/v) concentration, respectively. The dynamic modulus of Ca-salt of l-carrageenan increased with increase in concentration and gelation occurred at a concentration of 0.3/100 (w/v) at room temperature. The Ca-salt showed larger values than did of Na- and K-salts of l-carrageenan in dynamic viscoelasticity.