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Potassium Sorbate (E 202) – Preservative Explained

Potassium sorbate is a widely used preservative in foods, cosmetics, and pharmaceuticals. It inhibits the growth of molds, yeasts, and bacteria and is considered safe when used as intended.

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Things worth knowing about "Potassium sorbate"

Potassium sorbate is a widely used preservative in foods, cosmetics, and pharmaceuticals. It inhibits the growth of molds, yeasts, and bacteria and is considered safe when used as intended.

What is Potassium Sorbate?

Potassium sorbate (chemical name: potassium salt of sorbic acid, E 202) is a synthetically produced preservative used worldwide in the food, cosmetics, and pharmaceutical industries. It is the potassium salt of sorbic acid, a naturally occurring organic acid originally derived from the berries of the rowan tree (Sorbus aucuparia). Today, potassium sorbate is predominantly produced by chemical synthesis and appears as a white, crystalline powder or granule that dissolves readily in water.

Mechanism of Action

Potassium sorbate acts as an antimicrobial agent by inhibiting the growth of molds, yeasts, and certain bacteria. Once absorbed into a microbial cell, sorbic acid disrupts key enzymatic functions, thereby interfering with cellular metabolism. The substance is most effective in an acidic pH range (pH 3 to 6.5), where it predominantly exists in its uncharged, membrane-permeable acid form. At higher pH levels, the antimicrobial efficacy decreases significantly.

Applications

Food Products

In the food industry, potassium sorbate is listed under the E number E 202 and is approved in the European Union. Typical applications include:

Cheese and dairy products
Bread and baked goods
Wine and fruit juices
Margarine and salad dressings
Dried fruits and fruit preparations
Jams, jellies, and marmalades

Cosmetics and Personal Care Products

In cosmetics, potassium sorbate serves as a preservative in products such as moisturizers, shampoos, lotions, and toothpastes. It is considered a comparatively well-tolerated alternative to other preservatives such as parabens.

Pharmaceuticals

In the pharmaceutical industry, potassium sorbate is used as an excipient in liquid medicines, syrups, and topical preparations to extend their shelf life.

Safety and Health Assessment

Potassium sorbate is regarded as safe by major international regulatory authorities, including the European Food Safety Authority (EFSA) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA), when used as intended. The acceptable daily intake (ADI) for sorbic acid and its salts is set at 25 mg per kilogram of body weight per day.

In rare cases, hypersensitivity reactions may occur, particularly in individuals with known food intolerances. Symptoms can include skin irritation, itching, or gastrointestinal discomfort. Compared to many other preservatives, however, potassium sorbate is considered well tolerated and is approved in numerous countries worldwide.

Labeling and Consumer Tips

On food ingredient lists, potassium sorbate is declared either by its name or as E 202. Consumers who wish to avoid preservatives may look for products without additives or those preserved by alternative methods such as freezing or pasteurization. If you suspect an intolerance, it is advisable to consult a physician or a registered dietitian for personalized guidance.

References

European Food Safety Authority (EFSA): Re-evaluation of sorbic acid (E 200) and potassium sorbate (E 202) as food additives. EFSA Journal, 2015. Available at: https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2015.4144
Joint FAO/WHO Expert Committee on Food Additives (JECFA): Sorbic acid and its salts. WHO Food Additives Series. Available at: https://www.who.int/groups/joint-fao-who-expert-committee-on-food-additives-(jecfa)
Belitz, H.-D.; Grosch, W.; Schieberle, P.: Food Chemistry. 4th edition. Springer, Berlin/Heidelberg, 2009.

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