Polysaccharides from Chilean Seaweeds. II. Studies on Iridaea laminarioides

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Abstract
It was found that the water soluble polysaccharide from I. laminarioides has a galactose:3,6-anhydrosugar:sulphate molar relation of 1.00:0.32:1.07. This polysaccharide was fractionated into 3 fractions by precipitation with KCl. At 0.0625 M KCl concentration, fraction 1 (4%), having a molar relation of 1.00:0.14:0.95, was separated. With 0.25 M KCl concentration, fraction 2 (15.7%) of molar relation 1.00:0.50:1.15 was isolated. From the remaining, fraction 3 (30.3%) of molar relation 1.00:0.33:1.56 was separated. By correlation with literature data it may be concluded that the polysaccharide from I. laminarioides approaches the composition and the properties of a carrageenan. The deviation shown by this colloid from the composition and the behavior of the most typical carrageenans is less pronounced than that shown by many polysaccharides classified in this group.