Potassium fumarate

Potassium fumarate (CAS 7704-72-5, formula C4H4O4·xK) is the potassium salt of fumaric acid, also known as dipotassium fumarate or fumaric acid potassium salt. It carries no assigned E-number and is not listed as a direct food additive in EU regulations, though it appears as a processing-related compound in food and pharmaceutical contexts.

In food and beverage formulations, potassium fumarate functions as an acidulant and pH buffer, donating protons to lower and stabilise acidity while contributing a clean, tart taste profile. In pharmaceutical applications, it serves as a buffering agent in oral dosage forms, helping to maintain target pH ranges that influence active ingredient stability and dissolution behaviour.

Potassium fumarate is available in food-grade and pharmaceutical-grade qualities, with compliance assessed against FCC and internal pharmacopoeial specifications where applicable. It falls under REACH registration requirements for EU supply. Typical packaging includes fibre drums and multi-wall bags for bulk procurement.