Abstract
Summary
Alginic acid possesses sodium and potassium ion exchange properties which compare favorably with those of a carboxylic type cationic exchange resin. Under in vitro conditions alginic acid at pH 7.6 adsorbs 4.2 meq Na+ per g. The total cation adsorption from solutions containing K+ and Na+ is also 4.2 meq/g and the ratio of Na:K combined approximates that present in solution. The adsorption of Ca++ by alginic acid is irreversible and independent of pH. The hydrophilic character of the sodium and potassium alginates may contribute to the elimination of fluid and cause laxation.
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