Calcium ferrocyanide
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Description
Calcium ferrocyanide (E538) is a food additive belonging to the anticaking agent category. It is the calcium salt of ferrocyanic acid, a complex of iron(II) cyanide and calcium. Its chemical formula is Ca2[Fe(CN)6]·12H2O. Industrially, it is obtained by reacting sodium ferrocyanide with calcium chloride, followed by crystallization and drying. It appears as a pale yellow crystalline powder, odorless, stable in air, and soluble in water. Its main function is to prevent caking in powdered products, improving their flowability.
Historically, ferrocyanides have been used since the early 20th century as anticaking agents in table salt. In the European Union, E538 was authorized after evaluations by EFSA (European Food Safety Authority) and WHO (World Health Organization). EFSA established an Acceptable Daily Intake (ADI) of 0-0.025 mg/kg body weight for ferrocyanides (expressed as ferrocyanide ion). The overall safety assessment indicates that, at authorized doses, it poses no health risk. In food labeling, it must be listed as "calcium ferrocyanide" or "E538".
It is important to note that although it contains cyanide in its structure, it is strongly chelated and not released under physiological conditions, so it is not toxic. The food safety of E538 is supported by numerous toxicological studies confirming its low acute and chronic toxicity.
E538 is used exclusively as an anticaking agent in powdered foods. According to EC Regulation 1333/2008, it is authorized in the European Union for the following products: table salt and salt substitutes (maximum limit: 20 mg/kg expressed as anhydrous calcium ferrocyanide). It is also permitted in low-sodium salts and salts for use in the food industry.
In the Spanish market, it is found in brands of common salt, sea salt, and specialty salts (such as Himalayan salt or smoked salt) that list "anticaking agent E538" on their label. It is not authorized in other foods such as flours, sugar, or spices, unlike other anticaking agents like E551 (silicon dioxide). In the United States, the FDA allows calcium ferrocyanide as an anticaking agent in salt with a maximum limit of 13 mg/kg (expressed as anhydrous sodium ferrocyanide). In Japan, its use is restricted to salt with a limit of 20 mg/kg.
The comparison shows that limits are similar internationally, reflecting a consensus on its safety at authorized doses.
Toxicological studies conducted by EFSA and WHO have not documented significant adverse effects associated with the consumption of calcium ferrocyanide at authorized doses. The ADI of 0-0.025 mg/kg body weight was established with a wide safety margin. The biological mechanism involves that the ferrocyanide ion is not significantly absorbed in the gastrointestinal tract and is mostly excreted in feces.
No carcinogenic, genotoxic, or teratogenic effects have been observed in animal studies. Sensitive populations such as individuals with renal insufficiency may have reduced excretion, but the amounts ingested are so low that they pose no risk. No interactions with medications are known.
In cases of accidental massive ingestion (very unlikely in food), cyanosis due to cyanide release could occur, but this would require doses far higher than those permitted. The conclusion of EFSA and WHO is that E538 is safe for the consumer under the authorized conditions of use. However, some consumers may prefer to avoid additives with the term "cyanide" in their name, even though there is no evidence of risk.
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