抄録
We extracted the novel sulfated polysaccharide (Sacran) from cyanobacteria, Aphanothece sacrum (A. sacrum). Sacran contained sulfate, carboxyl, and amide groups as functional ones. The constituent monosaccharides of Sacran were mainly neutral sugar such as glucose, galactose, and mannose, and we additionally confirmed uronic acids and slight amount of amino sugars such as GalN, and Mur. Then sacran can be regarded as glyco-ampholytes with imbalanced charge ratio. Furthermore it was found that Sacran was supergiant biopolymers with a high molecular weight, ea. 1.6 x 107 Da, and radius gyration was ea. 400 nm. Sacran solution with a concentration of 1 wt.% showed a very high zero-share viscosity value (83 000 cps). Sacran was successfully cross-linked with cross-linking agents such as L-lysine and adipoyl dihydrazide to form tough gels with a high swelling degree, ea. 400 times to the weight of the dried gel.
