Potassium fumarate

Potassium fumarate (CAS 7704-72-5), also known by its food additive designation E366, is the potassium salt of fumaric acid used commercially as a pH buffer and acidulant.

Where is Potassium fumarate used?

• Food and beverage: acidulant and pH regulator in soft drinks and powdered drink mixes
• Fruit-flavored products: tartness control
• Bakery and confectionery: dough pH adjustment and texture consistency
• Pharmaceutical formulations: buffering agent in oral solid dosage forms and effervescent preparations
• Dietary supplement blends: potassium source combined with fumarate anion delivery
• Dipotassium fumarate offers a milder acidic profile than free fumaric acid.

Good to know: Dipotassium fumarate offers a milder acidic profile than free fumaric acid. Food-grade material conforming to E366 specifications is the most commonly traded form.

Commercial specifications

• Food-grade conforming to E366 specifications
• Bulk supply standard; smaller packaging for formulation and QA sampling