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Carrageenan

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Carrageenan

(Science: plant biology) Sulphated cell wall polysaccharide found in certain red algae. Contains repeating sulphated disaccharides of galactose and (sometimes) anhydrogalactose.

It is used commercially as an emulsifier and thickener in foods and is also used to induce an inflammatory lesion when injected into experimental animals (probably activates complement).