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E400 - Alginic acid
Functions: Carrier, Emulsifier, Humectant, Sequestrant, Stabiliser, Thickener
Alginic acid, also called algin or alginate, is a polysaccharide distributed widely in the cell walls of brown algae, where through binding with water it forms a viscous gum. It is also a significant component of the biofilms produced by the bacterium Pseudomonas aeruginosa, the major pathogen in cystic fibrosis, that confer it a high resistance to antibiotics and killing by macrophages. Its colour ranges from white to yellowish-brown. It is sold in filamentous, granular or powdered forms. - Wikipedia
EFSA evaluation: Re‐evaluation of alginic acid and its sodium, potassium, ammonium and calcium salts -E 400–E 404- as food additives (2017/11/10)