Sodium alginate
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Description
E401, known as sodium alginate, is a food additive classified as a thickener, gelling agent, and stabilizer. It is obtained from brown seaweed (Phaeophyceae), mainly from the genera Laminaria, Macrocystis, and Ascophyllum, through an alkaline extraction process. Industrially, the seaweed is washed, treated with sodium carbonate to solubilize the alginate, filtered, precipitated with calcium chloride, and converted into sodium alginate via ion exchange.
The final product is a white or yellowish powder, odorless and tasteless, soluble in water forming viscous solutions. Its chemical structure is a linear polysaccharide composed of β-D-mannuronic acid (M) and α-L-guluronic acid (G), whose ratio determines its gelling properties. In the presence of calcium ions, it forms thermostable gels.
Historically, alginate was discovered in 1881 by British chemist E. C. C. Stanford, and its food use was approved in the European Union after evaluations by EFSA and the WHO JECFA. EFSA has established that it is not necessary to set a specific Acceptable Daily Intake (ADI), as it is considered safe at authorized use levels. WHO also classifies it as "not specified" regarding ADI.
On labeling, it must appear as "sodium alginate" or "E401". Its safety profile is excellent, with no significant adverse effects documented in humans at usual consumption levels. It is widely used in the food industry for its ability to thicken, gel, and stabilize emulsions, improving the texture and consistency of products.
E401 is used in numerous food categories according to EC Regulation 1333/2008. It is used in ice cream (up to 1 g/kg), dairy desserts, sauces, mayonnaises, bakery products, plant-based beverages, and processed meat products.
In the Spanish market, it is commonly found in artisanal ice creams, custards, flans, vegetable creams, and sauces such as béchamel. It is also used in the preparation of spherification in molecular cuisine. Authorized limits vary by category: for example, in ice cream the limit is 1 g/kg, in emulsified sauces up to 5 g/kg, and in cocoa and chocolate products up to 10 g/kg. The FDA recognizes it as GRAS (Generally Recognized As Safe) without specific limits, while in Japan it is permitted with restrictions similar to the EU.
Its versatility makes it ideal for products requiring creamy texture or cold gelation.
Sodium alginate is considered safe by EFSA and WHO. No significant adverse effects have been documented in humans at usual consumption levels. Animal studies with very high doses (above 5 g/kg body weight) have shown possible laxative effects due to its water-retaining capacity, but these are not reached in the human diet. In people with severe gastrointestinal disorders, excessive consumption could cause mild discomfort such as bloating or diarrhea.
No relevant drug interactions have been reported, although theoretically it could interfere with mineral absorption if consumed in large amounts, but there is no clinical evidence. EFSA concludes that it is not necessary to establish an ADI, and WHO classifies it as "not specified".
In summary, it is one of the safest additives, with no documented side effects under normal use conditions.
- Sodium alginate
- Sodium salt of alginic acid
- Sodium alginate
- Algin
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