E452(vi) – Sodium potassium hexametaphosphate

General Information

Sodium Potassium Hexametaphosphate (food additive E452(vi)) is a subtype of E452 (polyphosphates). It is a mixed sodium and potassium salt of polymeric orthophosphoric acid, typically consisting of six phosphate units. The chemical formula of the substance is (Na,K)_n[(PO₃)_n], where n ≈ 6.

Sodium potassium hexametaphosphate is produced by polycondensation of orthophosphoric acid, followed by neutralization with a mixture of sodium and potassium hydroxides or carbonates. The process is carried out at high temperatures, resulting in the formation of cyclic or linear polyphosphate structures.

A key characteristic of E452(vi) is its high solubility and strong complexing ability. The additive effectively binds calcium and magnesium ions, preventing salt precipitation, stabilizes the texture of protein-based products, and helps retain moisture. Due to its combined sodium and potassium content, the additive allows for balancing sodium levels in formulations, which is important in developing reduced-sodium food products.

In the food industry, E452(vi) is used as a stabilizer, moisture-retaining agent, and emulsifier. It is widely applied in the production of meat products, semi-finished goods, sausages, fish products, processed cheeses, and confectionery items. The additive improves product texture and juiciness, increases yield, and extends shelf life.

For more detailed information about the properties and applications of polyphosphates, see the article «E452 – Polyphosphates».