Calcium aluminium silicate
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Description
E556, also known as calcium aluminium silicate, is a food additive classified as an anticaking agent. It is a synthetic inorganic compound obtained by reacting sodium silicate with calcium and aluminium salts, followed by a drying and grinding process.
Its approximate chemical formula is CaAl2Si2O8, although it may vary depending on the manufacturing process. It appears as a white, fine, odorless and tasteless powder, insoluble in water and most organic solvents. Its main function is to prevent the formation of lumps in powdered products, improving their flow and facilitating dosing.
The history of its use as a food additive dates back to the mid-20th century, and it was approved in the European Union after evaluations by the European Food Safety Authority (EFSA) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA). EFSA established an Acceptable Daily Intake (ADI) of 0-0.6 mg/kg body weight for aluminium from all sources, including E556, while JECFA set an ADI of 0-2 mg/kg body weight for aluminium.
The overall safety assessment indicates that, within the established limits, consumption of E556 does not pose a significant health risk. On food product labels, it must appear as "calcium aluminium silicate" or with its E number (E556).
It is important to note that dietary exposure to aluminium is a concern for some organizations, although regulatory authorities consider current levels to be safe for the general population.
E556 is mainly used as an anticaking agent in powdered foods. According to EC Regulation 1333/2008, it is authorized in the European Union for use in a variety of products, including salt and salt substitutes, spices and seasonings, and some confectionery products. Maximum use levels vary by food category; for example, in salt and salt substitutes, the limit is 10 g/kg (expressed as aluminium).
In Spain, it is commonly found in table salt, garlic salt, onion salt, and spice blends. It may also be present in some baking powders and bakery products. Compared to the US FDA, calcium aluminium silicate is allowed as a GRAS (Generally Recognized as Safe) additive under certain conditions, with limits similar to European ones. In Japan, its use is permitted under certain restrictions.
It is important to note that although E556 is effective as an anticaking agent, its use has declined in some products due to a preference for aluminium-free alternatives such as silicon dioxide (E551) or calcium silicate (E552).
The side effects of E556 are mainly related to its aluminium content. Chronic exposure to high levels of aluminium has been associated with neurotoxicity and a possible contribution to neurodegenerative diseases such as Alzheimer's, although the evidence is inconclusive. Animal studies have shown that high doses of aluminium can cause toxicity to the nervous and skeletal systems. However, the acceptable daily intakes (ADIs) established by EFSA and JECFA are designed to protect the general population, including the most sensitive groups.
EFSA concluded that dietary exposure to aluminium does not pose a health risk for most consumers, although it noted that some groups with diets very rich in aluminium-containing foods could exceed the ADI. Sensitive populations include people with chronic kidney disease, as they have a reduced ability to excrete aluminium, which can lead to accumulation and toxicity. No significant interactions with medications have been documented, although aluminium can interfere with the absorption of some drugs if ingested simultaneously.
In summary, E556 is considered safe in authorized amounts, but moderation in the consumption of products containing aluminium additives is recommended, especially for people with kidney problems.
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