Alginic acid : chemical structure, uses and health benefits by Adrianna Moore

By Adrianna Moore

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To commercially prepare alginates, the algae is harvested and dried before further processing. The dried material is treated with a diluted acidic solution in order to extract alginate and to remove other homopolysaccharides. In this step, the alkaline earth cations, which are part of the alginate salt form, are exchanged for H+. Then, the alginate is then converted from the insoluble protonated form to the soluble sodium salt by addition of sodium carbonate at a pH below 10. After extraction, the alginate can be further purified and then converted to either a salt or acid [23].

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