E452i - Polyphosphate de sodium

Origin

Sodium polyphosphate (E452i) is a synthetic food additive belonging to the polyphosphate family. It is produced by the polymerization of sodium orthophosphate under high temperatures. The resulting product is a mixture of polymeric phosphates composed of sodium oxide (Na₂O) and phosphorus pentoxide (P₂O₅). The chain length of the polyphosphate varies, influencing its properties and applications.

Usage

Sodium polyphosphate is widely used in the food industry as an emulsifier, sequestrant, stabilizer, and texturizer. It improves the texture and moisture retention of processed meats, preventing them from drying out during storage and cooking. In dairy products, it helps to stabilize proteins and prevent coagulation. It also acts as a buffering agent, controlling the pH of food products. Other applications include its use in processed cheeses to improve melting properties, in baked goods to enhance dough strength, and in seafood to reduce drip loss and maintain freshness. Sodium polyphosphate also finds use in water treatment and detergents due to its ability to sequester metal ions.

Side Effects

Sodium polyphosphate is generally considered safe for consumption at levels typically used in food. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has established an Acceptable Daily Intake (ADI) of 0-70 mg/kg body weight for total dietary phosphate from all sources, including sodium polyphosphate. Excessive consumption of phosphates can potentially lead to imbalances in calcium and phosphorus levels in the body, which may affect bone health, particularly in individuals with kidney problems. Some studies suggest a possible link between high phosphate intake and cardiovascular issues, but more research is needed to confirm these findings. Allergic reactions are rare but possible. Individuals with specific sensitivities should exercise caution.

Regulatory Status

Sodium polyphosphate (E452i) is approved for use as a food additive in many countries, including those in the European Union, the United States, Canada, and Australia. Regulations specify the maximum permitted levels in various food categories. In the EU, it is subject to specific purity criteria and labeling requirements. The FDA in the United States regulates its use under specific sections of the Code of Federal Regulations (CFR).