Phlorotannin
Class of chemical compounds / From Wikipedia, the free encyclopedia
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Phlorotannins are a type of tannins found in brown algae such as kelps and rockweeds[1] or sargassacean species,[2] and in a lower amount also in some red algae.[3] Contrary to hydrolysable or condensed tannins, these compounds are oligomers of phloroglucinol[4] (polyphloroglucinols).[5] As they are called tannins, they have the ability to precipitate proteins. It has been noticed that some phlorotannins have the ability to oxidize and form covalent bonds with some proteins. In contrast, under similar experimental conditions three types of terrestrial tannins (procyanidins, profisetinidins, and gallotannins) apparently did not form covalent complexes with proteins.[6]
These phenolic compounds are integral structural components of cell walls in brown algae, but they also seem to play many other secondary ecological roles such as protection from UV radiation and defense against grazing.