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Structural formula of carrageen

Is carrageen digestible by humans and why?

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Carrageenan is a family of linear sulphated polysaccharides typically obtained by alkali extraction from red seaweeds. It is named after Irish moss (Chondrus crispus), which is called carraigeen in Gaelic—moss of the rock. These chemicals are large, highly flexible molecules which curl around each other forming ...