Potassium adipate
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Description
Potassium adipate (E357) is a food additive used as an acidity regulator, pH regulator, and buffering agent. It is the potassium salt of adipic acid, a dicarboxylic acid that also occurs naturally in some fruits and vegetables, although industrial production is carried out by chemical synthesis. Industrially, adipic acid is obtained by oxidation of cyclohexane or cyclohexanol, and then neutralized with potassium hydroxide to form the salt.
Potassium adipate appears as a white crystalline powder, odorless, with a slightly salty taste, very soluble in water, and with a buffering capacity in a pH range close to neutrality. Its main function is to stabilize the acidity of foods, preventing variations that could affect taste, texture, or preservation.
In the European Union, E357 was authorized as a food additive after evaluations by the European Food Safety Authority (EFSA), which established an Acceptable Daily Intake (ADI) of 5 mg/kg body weight for adipic acid and its salts. The World Health Organization (WHO) has also evaluated its safety, concluding that it poses no significant risks at authorized doses. Regarding labeling, it must appear as 'potassium adipate' or 'E357' in the ingredient list.
The overall safety assessment is favorable, considering it a safe additive for the general population in permitted amounts. However, moderate consumption within a balanced diet is recommended.
Potassium adipate is mainly used in bakery products, pastries, beverages, desserts, jellies, jams, and processed meat products.
In the Spanish market, it can be found in sliced bread, industrial pastries, cookies, carbonated soft drinks, fruit jellies, and cooked sausages. Regulation EC 1333/2008 establishes maximum limits that vary by category: for example, in fine bakery wares up to 2,000 mg/kg, in non-alcoholic beverages up to 300 mg/L, and in heat-treated meat products up to 1,000 mg/kg. Compared to the United States, the FDA allows the use of potassium adipate as a direct food additive, with limits similar to European ones, while in Japan its use is restricted to certain products.
The versatility of E357 makes it an alternative to other acidity regulators such as potassium citrate (E332) or potassium phosphate (E340), offering a neutral taste and good stability.
Toxicological studies conducted by EFSA and WHO indicate that potassium adipate does not present significant adverse effects at authorized doses. In animal tests, very high doses (above 500 mg/kg/day) were observed to cause gastrointestinal irritation and electrolyte imbalances, but these levels are far above actual human intake. The ADI of 5 mg/kg/day includes a wide safety margin.
No carcinogenic, mutagenic, or teratogenic effects have been documented. Sensitive populations, such as individuals with renal insufficiency, might have difficulty excreting excess potassium, but the amounts present in foods are minimal. No interactions with medications are known. EFSA concludes that E357 is safe for the general population, with no need for additional restrictions.
In summary, potassium adipate is a well-tolerated additive with no documented side effects under normal conditions of use.
- Dipotassium salt of adipic acid
- Dipotassium adipate
- Dipotassium adipate
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