357 Cross-Linked Porphyran Bio-Hydrogels Containing Water-Soluble Polysaccharides

Friday, November 6, 2009
Mezzanine (Camino Real Hotel)
Kyouko Uemura , Department of Materials Science and Technology, Nagaoka University of Technology, Nagaoka, Japan
Takaomi Kobayashi , Department of Materials Science and Technology, Nagaoka University of Technology, Nagaoka, Japan
Toshihisa Sumi , Department of Bioengineering, Yatsushiro National College of Technology, Yatsushiro, Kumamoto, Japan
ractical application. It has been known that such laver contains water-soluble polysaccharides, Porphyran, having anionic sulfonic acid groups in the chemical structure. Therefore, porphyran seems to be significant applications as functional materials. In the present study, porphyran was purified from discolored lavers and applied for a novel bio-hydrogels crosslinked. Resultant porphyran having MW=70000 was cross-linked in alkali water with ethyleneglycol diglycidil ether (EGDE) by using 20 or 30 vol % of EGDE and 80 or 70 vol % of water dissolved porphyran 0.3 g in the presence of 0.1 to 0.35 M NaOH at 60 °C for 2h. The resultant bio-hydrogels showed extremely high swelling in water up to 1000-4000 % of water content. The water-sorbed conditions in the hydrogel were determined by measuring FT-IR spectra at different temperatures in the range of 30 to 60 °C. By observing the changes in hydrogen bonds between water and porphyran, it was found that such crosslinkage enhanced water sorption behavior of the hydrogels.