Alginic acid
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Description
E400, known as alginic acid, is a food additive classified as a thickener, gelling agent, and stabilizer. It is a natural polysaccharide extracted from brown algae (Phaeophyceae), mainly from species such as Laminaria hyperborea, Macrocystis pyrifera, and Ascophyllum nodosum.
Industrially, it is obtained through an alkaline extraction process: the algae are treated with a solution of sodium carbonate or sodium hydroxide to solubilize the alginate, then filtered and the alginic acid is precipitated by adding a mineral acid (such as hydrochloric acid). The precipitate is washed, dried, and ground to a white or yellowish powder. Chemically, alginic acid is a linear copolymer composed of β-D-mannuronic acid (M) and α-L-guluronic acid (G) units linked by 1→4 bonds. Its molecular weight ranges from 10,000 to 600,000 Da. It is insoluble in water, but its salts (alginates) are soluble and form gels in the presence of calcium ions. Its main function is to thicken, gel, and stabilize emulsions and foams.
It was discovered in 1883 by the British chemist E. C. C. Stanford. The European Union approved it as a food additive in 1995 (Directive 95/2/EC) and it is currently regulated by Regulation (EC) 1333/2008. EFSA (European Food Safety Authority) has evaluated its safety several times, most recently in 2017 (EFSA Journal 2017;15(6):4865), establishing an Acceptable Daily Intake (ADI) of "not specified," indicating no quantitative restrictions for its use in food.
The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has also evaluated alginic acid and its salts, assigning an ADI of "not limited." Globally, it is considered a safe additive, with no known adverse effects at the amounts used. On labeling, it must appear as "alginic acid" or "E400."
It is important to note that alginic acid is not absorbed in the gastrointestinal tract, so it acts as a soluble dietary fiber.
E400 is mainly used as a thickener, gelling agent, and stabilizer in a wide variety of foods. According to Regulation (EC) 1333/2008, it is authorized in numerous categories, including fine bakery products (up to 2000 mg/kg), ice cream (up to 1000 mg/kg), sauces and condiments (up to 5000 mg/kg), non-alcoholic beverages (up to 300 mg/kg), dairy desserts (up to 5000 mg/kg), and processed meat products (up to 5000 mg/kg).
In the Spanish market, it is commonly found in ice cream, yogurt, custards, flans, sauces such as mayonnaise and ketchup, and in industrial pastry products. It is also used in beer brewing to stabilize foam. Compared to the FDA, alginic acid is classified as GRAS (Generally Recognized as Safe) and is allowed in foods without specific limits, although good manufacturing practices limit its use to the amount necessary. In Japan, it is also approved as a food additive.
Maximum limits in the EU vary by product, but are generally generous due to its safety profile.
Alginic acid is considered safe by EFSA and JECFA, with no documented adverse effects in humans at the amounts used in foods. Being a non-digestible polysaccharide, it acts as dietary fiber and may have beneficial effects on intestinal health.
At very high doses (far above those used in foods), it could cause gastrointestinal discomfort such as bloating or flatulence, but no studies report toxicity. No carcinogenic, genotoxic, or reproductive effects have been identified in animal studies. No interactions with medications are known, although theoretically it could reduce the absorption of some nutrients or drugs by forming gels, but there is no significant clinical evidence. Sensitive populations such as people with severe digestive disorders may experience mild discomfort, but it is generally well tolerated.
EFSA concluded that there is no need to establish a numerical ADI, as dietary exposure does not pose a health risk. WHO also considers it safe.
Therefore, no relevant side effects have been documented under normal conditions of use.
- Alginate
- Alginic acid
- Polymannuronic acid
- Algin
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