Fumaric acid is used in bakery as acidity regulator, antibacterial agent and a shelf-life extender.

Fumaric Acid

What is Fumaric Acid?

Fumaric acid is an organic acid with the chemical formula C4H4O4. It is used in foods as an acidity regulator, an antibacterial agent and a shelf-life extender. As a food grade organic acid, it’s often used as a substitute for tartaric and citric acids.

It is widely used in:

  • Beverages
  • Baked goods
  • Powdery dessert mixes
  • Confectionery


Fumaric acid is found in nature in bolete mushrooms, lichen and Iceland moss. It was first isolated from the plant Fumaria officinalis.1 Commercially, it is produced chemically or enzymatically from starchy materials.2

It is a colorless, crystalline powder with the following chemical structure:

Chemical structure of Fumaric Acid.


In food and bakery products, it has the following functions:

  • Strong buffering capacity around pH 3.0.2
  • Antimicrobial activity
  • Acidulant and acid leavening properties
  • Flavor enhancing
  • Low water solubility (0.7 g/100 ml water at 30oC)

Commercial production

Fumaric acid is primarily produced using isomerization or biochemical routes.1

  • Isomerization: this method is based on the conversion of maleic anhydride to maleic acid and the cis–trans isomerization of maleic acid to the final product.
  • Biochemical: this method relies on bioconversion of substrates such as corn starch, corn straw, cassava bagasse or potato flour. It uses maleate isomerase produced by Pseudomonas and Arthrobacter species.


Typical applications of this type of acid in bakery systems are in:

  • Bread: added during blending to provide acid leavening. Also, it adds a pleasant  flavor in rye and sourdough breads
  • English muffins: helps improve dough machinability and baked muffin porosity
  • Tortillas: acts as a mold inhibitor, dough machinability improver and shelf life extender
  • Pie fillings: improves smoothness and optimum gelation by extending critical cook time

Other applications for this ingredient are refrigerated biscuit doughs or gelatin desserts.

FDA regulation

The use of this acid as a food additive, as well as the use of it’s and its calcium, ferrous, magnesium, potassium, and sodium salts, are regulated by the FDA (21CFR172.350).4


  1. Ilica, R-A., Kloetzer, L. and Galaction,A-I. Fumaric acid: production and separation. Biochemistry Letters, 4 (2018): 18.
  2. Das, R.K., Brar, S.K., and Verma, M. Fumaric acid: production and application aspects. In: Brar SK, Sarma SJ, Pakshirajan K (eds) Platform chemical biorefinery: future green chemistry, edn. Elsevier, Amsterdam, (2016), pp 133–152.
  3. Yang, S.T., Zhang, K., Zhang, B., and Huang, H. Biobased chemicals – fumaric acid. In: Young, M.M. (Ed.), Comprehensive Biotechnology. Elsevier, Netherland,2011,  pp. 163–177.
  4. “CFR – Code of Federal Regulations 21CFR172.350” Accessdata.fda.gov. 01 Apr. 2019. https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=172.350&SearchTerm=fumaric%20acid. Accessed 8 Nov 2019.