Fumaric acid

　　Main Uses

　　Food Industry

　　Acidulant: Refreshing taste with long-lasting sourness, commonly used in beverages (soda, fruit juice), jelly, candy, jam, etc. It can partially replace citric acid (usage is about 1/3 of citric acid with similar sourness intensity).

　　Preservative and Antioxidant Auxiliary: Capable of inhibiting microbial growth; compounding with potassium sorbate can enhance preservation effects. In meat products, it stabilizes color and prevents fat oxidation.

　　Leavening Agent Component: In baked goods (bread, biscuits), it reacts with sodium bicarbonate to release carbon dioxide, making the product fluffy while regulating acidity.

　　Pharmaceutical Field

　　As a pharmaceutical intermediate, used in the synthesis of L-Aspartic acid (nutritional supplement), Ferrous Fumarate (anti-anemia drug, absorption rate higher than ferrous sulfate), Ketotifen Fumarate (anti-allergy drug), etc.

　　Directly used in oral cleaning agents, utilizing its weak acidity to inhibit oral bacteria.

　　Chemical and Materials

　　Production of unsaturated polyester resins used in fiberglass, coatings, adhesives, etc. The double bonds introduced by fumaric acid can enhance the cross-linking density and mechanical properties of the resin.

　　Synthesis of plasticizers (e.g., dibutyl fumarate) and lubricants for plastic and rubber processing.

　　Used as a dyeing auxiliary in the textile industry to improve dye adhesion and levelness.

　　Feed Industry

　　As a feed additive, it improves livestock appetite and feed utilization efficiency. In ruminant feed in particular, it regulates rumen fermentation and increases protein absorption.