Potassium malate
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Description
E351, known as potassium malate, is a food additive classified as an acidity regulator. It is the potassium salt of malic acid, an organic acid naturally present in many fruits, especially apples.
Industrially, it is obtained by neutralizing malic acid with potassium hydroxide or potassium carbonate, followed by crystallization and drying. Malic acid is produced by chemical synthesis or microbial fermentation. Potassium malate appears as a white crystalline powder, odorless, with a salty and slightly acidic taste. It is highly soluble in water and stable under normal storage conditions. Its main function is to regulate the acidity (pH) of foods, acting as a buffer to maintain a stable pH. It can also enhance flavor and act as a metal sequestrant.
The history of its use as an additive dates back to the mid-20th century, and it was approved in the European Union after evaluations by EFSA and the Scientific Committee for Food (SCF). EFSA, in its 2013 re-evaluation, established an Acceptable Daily Intake (ADI) of 'not specified', indicating no health risk at normally consumed amounts. WHO, through JECFA, also considers it safe without the need for a numerical ADI.
Regarding food safety, potassium malate is metabolized in the body to malic acid and potassium, both normal components of metabolism. No significant adverse effects have been identified in animal or human studies. In food labeling, it must appear as 'E351' or 'potassium malate'. It is authorized in the EU for use in a wide variety of foods, with quantitative limits in some cases (quantum satis in others).
Overall, it is considered a safe and well-tolerated additive.
E351 is mainly used as an acidity regulator in a wide range of processed foods. According to EC Regulation 1333/2008, it is authorized in categories such as: non-alcoholic beverages (soft drinks, juices), dairy products (yogurts, dairy desserts), confectionery (candies, chewing gum), jams, jellies, canned fruits and vegetables, sauces, soups, and fine bakery products.
In the Spanish market, it is found in isotonic drinks, fruit soft drinks, flavored yogurts, and some dairy desserts. Usage limits vary: in non-alcoholic beverages, the maximum dose is 3 g/L (as malic acid); in dairy products, it is usually quantum satis (no quantitative limit, but according to good manufacturing practices). Compared to the FDA, potassium malate is considered GRAS (Generally Recognized as Safe) in the United States, without specific restrictions beyond good practices. In Japan, it is also permitted as an additive.
The versatility of E351 makes it useful for adjusting pH and enhancing the acidic taste of foods, serving as an alternative to citric acid or malic acid alone.
Side effects of E351 are virtually non-existent at the amounts used in foods. EFSA, in its 2013 opinion, concluded that there is no evidence of toxicity, carcinogenicity, genotoxicity, or adverse effects on reproduction. Animal studies with high doses showed no significant effects.
Potassium malate breaks down in the body into malic acid and potassium. Malic acid is an intermediate in the Krebs cycle, so it is metabolized naturally. Potassium is an essential mineral, but excess could be problematic in people with kidney failure or those taking medications that retain potassium (such as some diuretics). However, the amounts contributed by the additive are small compared to total dietary potassium intake.
No specific drug interactions have been documented. Sensitive populations, such as people with advanced kidney disease, should monitor their total potassium intake, but E351 does not pose a significant additional risk. WHO/JECFA also considers it safe without the need for a numerical ADI.
In conclusion, for the general population, E351 is a safe and well-tolerated additive, with no documented side effects under normal conditions of use.
- Potassium salt of malic acid
- Potassium malate (neutral form)
- Potassium hydrogen malate (acid form)
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