What is E340?

Potassium phosphate is a generic term for the salts of potassium and phosphate ions including:Monopotassium phosphate (KH2PO4) (Molar mass approx: 136 g/mol) Dipotassium phosphate (K2HPO4) (Molar mass approx: 174 g/mol) Tripotassium phosphate (K3PO4) (Molar mass approx: 212.27 g/mol) E340 sits in the E300–E399 series, which in the EU classification mainly covers antioxidants and acidity regulators.

What is E340 used for?

E340 belongs to the antioxidants group. Antioxidants stop fats going rancid and food discolouring. Several are natural, such as ascorbic acid (vitamin C).

Is E340 safe?

E340 is rated “moderate”. It is approved for use in food, but some people prefer to limit it. “Moderate” means it is approved, but is debated or something some people prefer to limit.

How E340 appears on labels

On food packaging you'll find E340 either as the number “E340” or by the name “Potassium phosphates” in the ingredient list, often after its function. Ingredients are listed in descending order by weight, so an additive near the end is present only in small amounts.

Is E340 vegan?

Yes, E340 is suitable for vegans.