Effects of Average Molecular Weights, their Concentrations, Ca~(++) and Mg~(~(++)) on Hydrophobicity of Solution of Na-Alginates Prepared from Sea Tangle Saccharina japonicus Produced in East Coast of Korea

摘要

We investigated the effects of Na-alginates's average molecular weight (AMW), their concentrations and divalent metal ions on hydrophobic interaction of solution of Na-alginates in sea tangle produced Saccharina japonicus in East Coast of Korea. As the AMWs of Na-alginates decreased, the formations rates of hydrophobic micro domains and pre-micelles between intermoleculars of Na-alginates were increased. The pre-micelles between Na-alginates chains fully were formed when their concentrations reached0.2%. In the effects of Ca~(++) and Mg~(++) on the hydrophobicity of Na-alginates solution, when the AMWs of Na-alginates were increased, the formation rates of hydrophobic micro domains produced by Ca'+ and Mg~(++) in alginates chains were increased. When Caf+ and Mg~(++) concentrations that were needed to form gels of alginates solutions were insufficient, the formations of pre-micelle in alginates having large AMW were more incomplete than those of small AMW. In the increasing range from 0.01 to 0.1mM in divalent metal ion concentration, the formation rate of pre-micelle in alginates solution added Caf f were more faster than that of Mg~(~(++)).