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E450 – Diphosphates: Uses and Health Effects

E450 is a food additive from the phosphate group, used as an emulsifying salt, stabiliser, and leavening agent in many processed foods.

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Things worth knowing about "E450"

E450 is a food additive from the phosphate group, used as an emulsifying salt, stabiliser, and leavening agent in many processed foods.

What is E450?

E450 refers to a group of food additives chemically known as diphosphates (also called pyrophosphates). They belong to the broader family of phosphates (E450–E452) and are approved as safe food additives by the European Union. E450 is found in a wide range of processed foods, where it serves several important technological functions.

Subgroups and Chemical Variants

The designation E450 covers several distinct compounds:

E450a: Disodium diphosphate
E450b: Trisodium diphosphate
E450c: Tetrasodium diphosphate
E450d: Dipotassium diphosphate
E450e: Tetrapotassium pyrophosphate
E450f: Dicalcium diphosphate
E450g: Calcium dihydrogen diphosphate

All variants are derived from diphosphoric acid and differ in the metal cation (sodium, potassium, or calcium) they are combined with.

Technological Functions

E450 is used in the food industry for a variety of reasons:

Emulsifying salt: In processed cheese, E450 creates a smooth, uniform texture by emulsifying casein proteins.
Leavening agent: In baked goods, E450 reacts with sodium bicarbonate to release carbon dioxide, causing dough to rise.
Stabiliser and emulsifier: E450 prevents the separation of fat and water in processed products.
Buffering agent: It regulates the pH level in various food products.
Moisture retention: In meat and fish products, E450 improves water-binding capacity and extends shelf life.

Occurrence in Foods

E450 is typically found in the following products:

Processed cheese and cheese spreads
Sausages and meat products
Baking powder and ready-made baking mixes
Frozen and convenience foods
Seafood and fish products
Instant puddings and dessert powders

Health Assessment

E450 has been evaluated by the European Food Safety Authority (EFSA). The acceptable daily intake (ADI) for all phosphates combined (E338–E452) is set at 40 mg per kilogram of body weight per day, expressed as phosphorus.

Scientific studies suggest that excessive intake of phosphate additives from processed foods may have negative effects on kidney function and calcium-phosphate balance. This is of particular concern for individuals with impaired kidney function (chronic kidney disease), as their kidneys are less able to excrete excess phosphate.

For healthy individuals, E450 is considered safe at the amounts typically found in food. However, nutrition experts recommend limiting the consumption of heavily processed foods with high levels of added phosphates.

Labelling and Regulation

In the European Union, E450 is authorised under Regulation (EC) No 1333/2008 on food additives. Manufacturers are required to declare E450 in the ingredient list, either by its E number or by the name diphosphate. Specific maximum permitted levels apply in certain food categories.

References

European Food Safety Authority (EFSA): Re-evaluation of phosphoric acid, mono- and di-potassium phosphates, mono-calcium and di-calcium phosphates as food additives. EFSA Journal, 2019.
Regulation (EC) No 1333/2008 of the European Parliament and of the Council on food additives.
Ritz E. et al.: Phosphate additives in food -- a health risk. Deutsches Ärzteblatt International, 2012.

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