E402 - Potassium alginate

Origin

Potassium alginate (E402) is a salt of alginic acid. Alginic acid is extracted from brown algae (Phaeophyceae), such as *Laminaria hyperborea*, *Laminaria digitata*, *Laminaria japonica*, *Ecklonia maxima*, *Macrocystis pyrifera*, and *Ascophyllum nodosum*. The extraction process involves alkaline extraction followed by precipitation with calcium chloride or hydrochloric acid. The resulting alginic acid is then neutralized with potassium hydroxide to produce potassium alginate.

Usage

Potassium alginate is used as a thickening agent, stabilizer, and gelling agent in a variety of food products. It is particularly useful in applications where a potassium salt is preferred over sodium or calcium salts. Common applications include: * Dairy products: Stabilizing ice cream, preventing crystal formation. * Sauces and dressings: Increasing viscosity and preventing separation. * Fruit preparations: Gelling agent in jams and jellies. * Baked goods: Improving texture and moisture retention. * Beverages: Stabilizing and thickening. It is also used in pharmaceutical and cosmetic applications.

Side Effects

Potassium alginate is generally considered safe for consumption. Alginates are poorly absorbed by the body, and most of it is excreted in the feces. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has established an Acceptable Daily Intake (ADI) of "not specified" for alginic acid and its salts, including potassium alginate. This means that, based on available data, the use of potassium alginate in food does not pose a health risk at the levels currently used. Some individuals may experience mild gastrointestinal discomfort, such as bloating or diarrhea, if they consume large amounts of alginates. Allergic reactions are rare.

Regulatory Status

Potassium alginate (E402) is approved for use as a food additive in the European Union (EU) and is listed in Annex II of Regulation (EC) No 1333/2008 on food additives. It is also approved for use in the United States by the Food and Drug Administration (FDA) under the Code of Federal Regulations (CFR) Title 21. It is also permitted in many other countries worldwide, subject to local regulations and limitations.