PROCESS FOR PURIFYING AND CONDENSING HIGH-MOLECULAR POLYSACCHARIDE EXTRACT OBTAINED FROM SEA WEED

摘要

An aqueous solution of a high-molecular polysaccharide such as carrageenin, agar-agar or alginic acid derivatives is effectively purified and concentrated with a high water permeation rate to a concentration of about 3.0 to about 4.5 wt % by allowing the solution to flow through ultrafiltration hollow body at a shearing speed of 5000 sec<-1> or more. Dilution of the aqueous solution with warm water before allowing to flow through the hollow body serves to effectively conduct preliminary filtration usually conducted for removal of sea weed residue in the extract and for removal of colorants due to decrease in viscosity, and the colorants and low-molecular impurities are effectively removed through entrainment by a large amount of water upon ultrafiltration. Thus, a highly pure product which has never been obtained by conventional process is obtained.