Hydrochloric acid
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Description
The food additive E507, known as hydrochloric acid, is an acidity regulator widely used in the food industry. It is an aqueous solution of hydrogen chloride (HCl), a strong mineral acid. Its origin is mainly synthetic, obtained industrially through the reaction of chlorine and hydrogen or as a byproduct of chemical processes. It can also be produced by the reaction of sulfuric acid with sodium chloride.
Hydrochloric acid is a colorless or slightly yellowish liquid with a pungent odor and is highly corrosive at high concentrations. In foods, it is used in very dilute concentrations (generally below 0.5%). Its main function is to adjust and stabilize the pH of products, providing an acidic environment that inhibits microbial growth and improves texture, flavor, and preservation.
Historically, hydrochloric acid has been used since ancient times in preservation processes, although its use as a food additive was approved in the European Union after evaluations by the European Food Safety Authority (EFSA) and the World Health Organization (WHO). EFSA, in its 2012 re-evaluation, established that it is not necessary to set a specific Acceptable Daily Intake (ADI), as its use in authorized amounts does not pose a health risk.
WHO, through the Joint FAO/WHO Expert Committee on Food Additives (JECFA), also considers it safe without a numerical limit. In food labeling, E507 must appear in the ingredient list, either by name or code.
In summary, hydrochloric acid is a safe and effective additive when used within established limits, contributing to food safety and the organoleptic properties of products.
E507 is used as an acidity regulator in various food categories. According to EC Regulation 1333/2008, it is authorized in: non-alcoholic beverages (soft drinks, juices), dairy products (cheeses, yogurts), canned vegetables, sauces, mayonnaise, processed meat products, beer, and other fermented products.
In the Spanish market, it is found in cola soft drinks (where it contributes to the characteristic acidic flavor), pickles (gherkins, olives), sauces such as mayonnaise and ketchup, and some processed cheeses. Authorized limits vary by product: in non-alcoholic beverages, the maximum amount is usually 300 mg/kg; in sauces and condiments, up to 500 mg/kg; in canned vegetables, sufficient quantity to achieve the desired pH (quantum satis). Comparatively, the FDA (USA) also considers it GRAS (Generally Recognized as Safe) without specific limits, while in Japan it is permitted with similar restrictions.
EFSA has confirmed that current usage levels do not pose a health risk.
Hydrochloric acid (E507) is considered safe by EFSA and WHO at the concentrations used in foods. No significant adverse effects in humans have been documented due to its consumption in authorized amounts.
The biological mechanism is simple: as a strong acid, it fully dissociates into H+ and Cl- ions in the stomach, contributing to normal gastric pH. Chloride is an essential electrolyte. Toxicological studies in animals have not shown carcinogenic, genotoxic, or reproductive effects at relevant doses. Sensitive populations, such as individuals with gastric disorders (ulcer, reflux), may experience discomfort if they consume large amounts of highly acidic foods, but this is not specific to E507.
No interactions with medications are known. EFSA concluded that it is not necessary to establish an ADI, as dietary exposure is low and does not pose a risk. At high concentrations (non-food), hydrochloric acid is corrosive, but in foods it is used diluted. Therefore, E507 is one of the safest additives, with no documented side effects under normal use conditions.
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