Sodium diacetate
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Description
Sodium diacetate (E262(II)) is a food additive primarily used as a preservative and acidity regulator. It is a double salt of acetic acid and sodium acetate, with the chemical formula NaH(C2H3O2)2. Industrially, it is obtained by the controlled reaction of acetic acid with sodium carbonate or hydroxide, followed by crystallization.
It appears as a white crystalline powder, hygroscopic, with a characteristic vinegar odor. Its main function is to inhibit the growth of molds and bacteria, especially in bakery products and snacks, extending their shelf life. Additionally, it acts as an acidulant, improving flavor and texture.
Sodium diacetate was approved as a food additive in the European Union after evaluations by EFSA and the Joint FAO/WHO Expert Committee on Food Additives (JECFA). EFSA established an acceptable daily intake (ADI) of 0-15 mg/kg body weight (expressed as acetic acid). WHO also considers it safe at authorized doses.
In food labeling, it must appear as 'sodium diacetate' or 'E262(ii)'. Its safety profile is high, with no significant adverse effects at usual usage concentrations. The food safety of E262(II) is supported by decades of use and multiple toxicological studies.
Sodium diacetate is used in various food categories according to EC Regulation 1333/2008. It is mainly used in fine bakery products (breads, buns, cookies) to prevent mold and improve texture. Also in snacks (potato chips, popcorn) as a preservative and flavor enhancer. In sauces and dressings, it acts as an acidulant and preservative.
In Spain, it is commonly found in sliced bread, packaged Spanish omelets, and industrial pastries. Authorized limits vary: in bakery up to 2000 mg/kg (expressed as acetic acid), in snacks up to 1000 mg/kg, and in sauces up to 5000 mg/kg. Compared to the FDA, the United States allows its use in foods as a GRAS (Generally Recognized as Safe) additive without specific limits, but with good manufacturing practices. Japan also authorizes it with restrictions similar to the EU.
The versatility of E262(II) makes it popular in the food industry for its dual preservative and acidulant function.
Toxicological studies conducted by EFSA and JECFA have not identified significant adverse effects associated with the consumption of sodium diacetate at authorized doses. In animal studies, very high doses (far above the ADI) caused gastric irritation, but no carcinogenic, genotoxic, or teratogenic effects were observed.
In humans, normal consumption does not cause adverse reactions. However, individuals sensitive to acetic acid (vinegar) may experience mild digestive discomfort if they consume large amounts. No relevant drug interactions have been documented. EFSA concluded that sodium diacetate is safe for the general population, including children, as long as established limits are respected. WHO supports this conclusion.
In summary, the safety profile is excellent and there is no evidence of concerning side effects under normal conditions of use.
- Sodium acid acetate
- Sodium hydrogen diacetate
- Sodium hydrogen diacetate
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