Carrageenin is the hot-water-soluble extractive of the red seaplants Chondrus crispus and Gigartina mamillosa, and other related species commonly referred to as Irish moss (5). The commercial product contains about 12% moisture and about 80% of the polysaccharide hydrocolloid, which is precipitated in 70% isopropanol. The remaining soluble materials are metallic
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