E237 - Sodium formiate

Origin

Sodium formate (E237) is the sodium salt of formic acid. It is produced industrially by reacting carbon monoxide with sodium hydroxide at high pressure and temperature. It can also be produced as a byproduct in the manufacture of other chemicals, such as pentaerythritol. Formic acid itself occurs naturally in various sources, including ants and stinging nettles, but sodium formate is primarily a synthetic product.

Usage

Sodium formate is used in a variety of applications. It functions as a preservative and acidity regulator in animal feed. It is also employed as a de-icing agent for roads and runways, as it is less corrosive than other salts like sodium chloride. In the textile industry, it is used as a mordant in dyeing and printing fabrics. Furthermore, it finds use in the leather tanning process. In laboratory settings, it can serve as a buffering agent. In construction, it can be used as a cement setting accelerator.

Side Effects

Sodium formate is generally considered safe for its intended uses. The European Food Safety Authority (EFSA) has evaluated sodium formate and concluded that it does not pose a significant health risk at the levels typically used in animal feed. However, excessive consumption of formic acid or formates can lead to metabolic acidosis, although this is rare with typical exposure levels from food additives. There is no established ADI (Acceptable Daily Intake) for sodium formate as a food additive, suggesting low concern at normal usage levels. As with any chemical substance, individuals with specific sensitivities may experience adverse reactions, but these are uncommon. High concentrations can cause irritation to the skin and eyes.