Fumaric acid
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Description
The food additive E297, known as fumaric acid, is an organic compound primarily used as an acidity regulator in the food industry. It is an unsaturated dicarboxylic acid that occurs naturally in some plants and fungi, such as Fumaria officinalis (hence its name), but it is also produced industrially through chemical synthesis.
The most common industrial process is the isomerization of maleic acid, which is obtained from the oxidation of benzene or butane. Fumaric acid appears as a white, odorless crystalline powder with a very intense acidic taste (approximately 1.5 times more acidic than citric acid). It is slightly soluble in cold water but dissolves better in hot water and alcohol. Its main function is to regulate the acidity of foods, acting as an acidulant, flavor enhancer, and preservative, as its acidifying action inhibits the growth of microorganisms. Additionally, it can act as a leavening agent in doughs.
Fumaric acid was approved as a food additive in the European Union following evaluations by EFSA (European Food Safety Authority) and WHO (World Health Organization) through JECFA (Joint FAO/WHO Expert Committee on Food Additives). EFSA established an Acceptable Daily Intake (ADI) of 6 mg/kg body weight per day, based on toxicological studies that showed no significant adverse effects.
WHO also considers it safe under authorized conditions of use. Regarding labeling, it must appear in the ingredient list as "fumaric acid" or "E297". Globally, the food safety of E297 is well supported by science, and no relevant health risks have been identified at the doses used in foods.
Fumaric acid (E297) is used in a wide variety of food categories as an acidity regulator. According to Regulation EC 1333/2008, it is authorized in products such as non-alcoholic beverages (soft drinks, juices), bakery and pastry products (to improve yeast action), dairy desserts, ice cream, jams, jellies, confectionery, sauces and condiments, and processed meat products.
In the Spanish market, it is found in cola soft drinks, cookies, fruit yogurts, and baking mixes. Maximum limits vary by product: for example, in non-alcoholic beverages it can be up to 1 g/kg, while in bakery products it is usually 2-3 g/kg. Compared to the US FDA, fumaric acid is classified as GRAS (Generally Recognized as Safe) and is permitted at similar levels. In Japan, it is also approved as a food additive with analogous restrictions. The versatility of E297 makes it popular in the industry due to its high acidity and low cost.
Toxicological studies conducted by EFSA and JECFA have not identified significant side effects associated with the consumption of fumaric acid at authorized doses. The ADI of 6 mg/kg/day was established with a wide safety margin. In humans, very high doses (above 10 g) may cause mild gastrointestinal irritation, but these amounts are not reached with normal food consumption. No carcinogenic, genotoxic, or teratogenic effects have been documented.
The biological mechanism of fumaric acid involves its participation in the Krebs cycle as a natural metabolic intermediate, so the body processes it efficiently. Sensitive populations, such as individuals with kidney disorders, may have difficulty excreting large amounts, but levels in foods are safe. No relevant drug interactions are known.
In conclusion, both EFSA and WHO consider E297 safe for the general population under current conditions of use.
- trans-Butenedioic acid
- Hydrogen fumarate
- INS 297
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