E338 — пищевая добавка, регулятор кислотности ортофосфорная кислота, phosphoric acid (Е338)

Orthophosphoric acid can only be obtained pure in the crystalline state and slowly undergoes dehydration to diphosphoric acid. Crystalline phosphoric acid has a hydrogen-bonded layer structure in which each molecule is attached to 6 others. Impure phosphoric acid has its main application in fertilisers, and also in the synthesis of pure phosphoric acid. In turn pure phosphoric acid is used in food, detergents, pharmaceuticals and metal treatment (e.g. pickling, cleaning, rust-proofing, polishing). Car bodies and electrical appliances are all protected against rust and blistering by the presence of a phosphatised undercoat. Phosphoric acid is used in the production of activated carbon, and may be used in soft drinks to give a sour taste. "Thermal" phosphoric acid is made by oxidation of phosphorus in the presence of water vapour whilst "wet" acid is made by treating rock phosphate with sulphuric acid.

Phosphoric acid is added to food to enhance the antioxidant effects of other compounds present, and also as an acidity regulator. Typical products include carbonated beverages, processed meat, chocolate, fats and oils, beer, jam, sweets. Too much in diet leads to loss of calcium in bones and onset of osteoporosis. In fizzy drinks it allows more carbon dioxide concentration without bottle burst. Soft drinks, beer, cheese products, snacks, and most processed foods. Other names: orthophosphoric acid. Phosphoric acid is banned in organic food and drinks. Phosphoric acid is a highly acidic ingredient in cola drinks, used to offset the extreme sweetness. The way the kidneys excrete it is by bonding it with calcium taken from the bones, which can then leave the bones porous and brittle, and increase the risk of osteoporosis. A study, published in the Archives of Paediatric and Adolescent Medicine in 2000, showed that athletic teenage girls who consume cola drinks have been found to have five times the risk of bone fractures of those athletic girls who do not consume cola drinks. Acceptable Daily Intake: Up to 70 mg/kg body weight. Phosphoric acid and phosphates can normally be consumed by all religious groups, vegans and vegetarians. Although animal bones are mainly made up of phosphates, commercial phosphate is not made from bones.



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