Potassium aluminium silicate
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Description
The food additive E555, known as potassium aluminium silicate, is an inorganic compound used primarily as an anticaking agent in powdered foods. It belongs to the group of silicates, which also includes E554 (sodium aluminium silicate) and E556 (calcium aluminium silicate).
Its origin is synthetic, obtained from the reaction of silica (silicon dioxide) with aluminium and potassium salts under controlled conditions. Industrially, it is produced by fusing quartz sand, potassium carbonate, and alumina, followed by a grinding and sieving process to obtain a fine powder with homogeneous particle size. Its physicochemical properties include being a white, odorless powder, insoluble in water and most organic solvents, with high moisture absorption capacity, which gives it its anticaking function by coating food particles and preventing them from clumping. The main function of E555 is to maintain the flowability of powdered products such as spices, baking mixes, powdered milk, cocoa, instant coffee, and salt substitutes. It is also used as a carrier for flavors and as a coating agent in some food supplements.
Historically, aluminium silicates have been used since the early 20th century, but their approval in the European Union was formalized with Directive 95/2/EC, currently included in Regulation (EC) 1333/2008 on food additives. The European Food Safety Authority (EFSA) has evaluated E555 on several occasions, most recently in 2018, establishing an Acceptable Daily Intake (ADI) of 0.1 mg of aluminium per kg of body weight per day, which applies to all aluminium-containing additives, including E555. The World Health Organization (WHO) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA) have also evaluated these compounds, setting a similar ADI.
The overall safety assessment indicates that, at authorized doses, E555 does not pose a significant health risk, although it is recommended to limit aluminium exposure due to potential long-term neurological effects. Regarding labeling, it must appear as 'potassium aluminium silicate' or 'E555' in the ingredient list.
It is important to note that Regulation (EU) 2019/891 sets maximum limits for aluminium from additives in certain foods, ensuring that total exposure remains within the ADI.
E555 is used in a wide variety of powdered foods to prevent lump formation and improve flowability. According to Regulation (EC) 1333/2008, it is authorized in categories such as: spices and seasonings (maximum limit 30 g/kg), baking mixes (up to 20 g/kg), powdered milk and powdered cream (10 g/kg), instant coffee and substitutes (10 g/kg), cocoa powder (10 g/kg), and food supplements (quantum satis for anticaking effect).
In the Spanish market, it is found in products such as ground spices (paprika, curry), tortilla mixes, instant soups, protein shakes in powder, and some table sweeteners. The US FDA allows the use of aluminium silicates as anticaking agents in foods, but does not have specific regulation for E555; instead, it is considered GRAS (Generally Recognized as Safe) under certain conditions. Japan also authorizes potassium aluminium silicate, with limits similar to European ones.
It is important to note that the current trend in the food industry is to reduce the use of aluminium additives, so some manufacturers opt for alternatives such as silicon dioxide (E551) or calcium silicate (E552).
Documented side effects of E555 are mainly related to aluminium exposure, which can accumulate in the body. Animal studies have shown that high doses of aluminium can cause neurotoxicity, affect the skeletal and renal systems, and have been associated with neurodegenerative diseases such as Alzheimer's, although there is no conclusive evidence in humans. EFSA, in its 2018 evaluation, concluded that dietary exposure to aluminium from additives, including E555, does not exceed the ADI of 0.1 mg/kg/day in the general population, so it is not considered a significant risk. However, sensitive populations such as young children, people with renal insufficiency, or those with high exposure from other sources (medications, cosmetics) may be at higher risk.
No specific drug interactions with E555 have been described, but aluminium can interfere with the absorption of certain medications such as antibiotics (tetracyclines, quinolones) and iron, so it is recommended to separate the intake of these drugs from foods containing aluminium additives. WHO and EFSA agree that, within authorized limits, E555 is safe for the general population. However, some consumer groups and environmental organizations have requested the restriction of all aluminium additives as a precaution, which has led the European Union to periodically review limits and encourage the reduction of their use.
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