Ammonium alginate
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Description
E403, known as ammonium alginate, is a food additive classified as a thickener, gelling agent, and stabilizer. It is obtained from alginic acid, a natural polysaccharide extracted from brown algae (Phaeophyceae), mainly from species such as Laminaria hyperborea, Macrocystis pyrifera, and Ascophyllum nodosum.
Industrially, ammonium alginate is produced by neutralizing alginic acid with ammonium hydroxide, followed by a drying and grinding process. It is a white or yellowish powder, soluble in cold water, forming viscous solutions.
Its main function is to thicken, gel, and stabilize foods, improving texture and preventing ingredient separation. It was approved as a food additive in the European Union after evaluations by EFSA (European Food Safety Authority) and JECFA (Joint FAO/WHO Expert Committee on Food Additives). EFSA established an Acceptable Daily Intake (ADI) of 70 mg/kg body weight for alginates (E400-E404), based on toxicological studies that showed no significant adverse effects. WHO also supports its safety.
Regarding labeling, it must appear as "ammonium alginate" or "E403" in the ingredient list.
Globally, it is considered a safe additive for the general population, with no special restrictions beyond good manufacturing practices.
Ammonium alginate is used in a wide variety of foods as a thickener, gelling agent, and stabilizer. According to EC Regulation 1333/2008, it is authorized in numerous categories, including dairy products (yogurts, dairy desserts), ice cream, sauces, soups, bakery products, confectionery, beverages, and prepared foods.
In the Spanish market, it is found in artisanal ice creams, custards, flans, salad dressings, and industrial bakery products. Authorized limits vary by category; for example, in ice cream it may be used up to 10 g/kg, while in sauces and soups the limit is 5 g/kg. The FDA classifies it as GRAS (Generally Recognized as Safe) for similar uses, although with some differences in permitted categories. In Japan, it is also approved with similar restrictions.
The comparison shows that the EU has more detailed regulation by category, while the FDA allows its use in foods generally following good manufacturing practices.
Toxicological studies conducted by EFSA and JECFA have not documented significant adverse effects associated with the consumption of ammonium alginate at permitted levels. It has been observed that at very high doses (far above the ADI), it could have a laxative effect due to its ability to retain water in the intestine, but this is not relevant at the concentrations used in foods.
No carcinogenic, genotoxic, or teratogenic effects have been identified in animal studies. The biological mechanism is simple: being a non-digestible polysaccharide, it passes through the gastrointestinal tract without being absorbed, acting as soluble fiber. Sensitive populations, such as people with severe digestive disorders, might experience mild discomfort if they consume large amounts, but there are no specific contraindications. No interactions with medications are known.
The conclusion of EFSA and WHO is that ammonium alginate is safe for the general population at authorized use levels.
- Ammonium alginate
- Ammonium alginic acid salt
- Ammonium salt of alginic acid
- Ammonium alginate
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