| 摘要 |
[Problem] To reduce the amount of water needed for the extraction and purification of polysaccharides from an organism containing polysaccharides, such as seaweed, to 1/3 - 1/4 the original amount, and also reduce the volume of the water tank, and thereby simplify the filtration process and the like, and achieve a lower cost. [Solution] When a polysaccharide is extracted from an organism containing polysaccharides using alkaline water containing an alkali metal, hydrogen peroxide is added and treatments such as filtration are performed. For instance, alginic acid is obtained from seaweed by a method characterized in comprising: a first step for obtaining an alginic acid extract liquid by immersing seaweed in an alkaline solution containing an alkali metal to which hydrogen peroxide has been added, extracting the alginic acid in the seaweed, and then removing the solid content; a second step for producing a solid by adding an acid or Ca compound aqueous solution to the alginic acid extract liquid obtained in the first step; and a third step for obtaining alginic acid by dehydrating the solid produced in the second step. |
