Adv. Mater. 2019, 31, 1902381


Natural polysaccharides, such as alginic acid, and pectin are difficult to dissolve uniformly in water. Therefore, high-concentration polysaccharide solutions have been restricted. If polysaccharides of sufficient concentration are directly added, it may cause solutes to agglomerate and be difficult to evenly distribute.  Moreover, it is difficult to prepare a hydrogel with sufficient strength using this solution. The author was inspired by the traditional Chinese cooking method to increase the concentration of the polysaccharide solution by volatilizing the water phase, and due to the strengthening of the hydrogen bond, the hydrogen bond between the polysaccharide chain and the chain. The interaction has been strengthened. By this method, a 25% sodium alginate solution can be obtained, which is much higher than the concentration of sodium alginate obtained by direct dissolution. After testing, the hydrogel has a higher mechanical strength than traditional preparations and has good processing performance, various shapes can be prepared.

DOI: 10.1002/adma.201902381