| 摘要 |
PURPOSE:To insolubilize an acidic polysaccharide without detriment to its strength, by contacting an aqueous solution of an acidic polysaccharide with an aqueous solution containing an Al salt and a reagent for solubilizing the Al salt and having a pH value near neutrality and contacting the combined solution with an aqueous solution of a Ca salt. CONSTITUTION:An acidic polysaccharide (e.g., K-carrageenan containing Na as a counter cation) is insolubilized by contacting its aqueous solution with an aqueous solution (pH of 4-10) containing an Al salt (e.g., AlCl3) and a reagent for solubilizing the Al salt [e.g., citric acid (Na salt)] and contacting the combined solution with an aqueous solution of a Ca salt (e.g., CaCl2). An acidic polysaccharide has heretofore been well insolubilized with an Al salt, but an aqueous solution of a water-soluble Al salt shows a strong acidity of a pH of 2-3 and, when it is allowed to gel, it is degraded to form an insolubilized product fo a decreased strength. Further, while most of its spherical products contain a flavoring component, an effective component, etc., some of these components lose effectiveness in a strongly acidic environment. According to the present process, an acidic polysaccharide can be insolubilized without encountering the above drawbacks.
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