Zinc acetate
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Description
Zinc acetate (E650) is a food additive used mainly as a flavor enhancer and stabilizer. It is the zinc salt of acetic acid, with formula Zn(CH3COO)2. Industrially, it is obtained by reacting zinc oxide or carbonate with acetic acid, followed by crystallization.
It appears as a white crystalline powder, soluble in water and ethanol, with a slightly astringent taste. Its main function in foods is to enhance flavor, especially in products such as chewing gum, candies, and dietary supplements. It also acts as a preservative and stabilizer in some products.
Zinc acetate was approved as a food additive in the European Union after evaluations by EFSA (European Food Safety Authority) and WHO (World Health Organization). EFSA established an Acceptable Daily Intake (ADI) of 0.3-1.0 mg/kg body weight for total zinc, considering all sources.
Zinc acetate is considered safe at authorized doses, although excessive consumption can cause zinc toxicity. It must be labeled as 'zinc acetate' or 'E650'. The food safety of E650 is supported by toxicological studies that show no adverse effects at usual concentrations.
E650 is mainly used in chewing gum, candies, confectionery products, and food supplements.
In the Spanish market, it is found in sugar-free chewing gum, mint candies, and breath mints. It is also used in dietary and zinc-fortified products. Regulation EC 1333/2008 authorizes its use in quantum satis amounts (no specific maximum limit) in chewing gum and candies, and in food supplements up to 15 mg of zinc per recommended daily dose. In the United States, the FDA considers it GRAS (Generally Recognized as Safe) for similar uses. In Japan, its use is permitted in chewing gum and candies. No significant differences in authorized limits between regions have been reported.
Adverse effects of zinc acetate are mainly related to zinc toxicity when consumed in excess. High zinc intake (more than 40 mg/day in adults) can cause nausea, vomiting, abdominal pain, diarrhea, and headaches. Long-term, high doses can interfere with copper absorption, leading to copper deficiency and anemia.
The biological mechanism involves competition of zinc with copper in intestinal transporters. Sensitive populations include people with kidney disease, gastrointestinal disorders, or those taking zinc supplements. Drug interactions: zinc can reduce absorption of antibiotics (tetracyclines, quinolones) and penicillamine. EFSA and WHO conclude that zinc acetate is safe at authorized doses, as dietary exposure to zinc from additives is low compared to total zinc intake. No carcinogenic, mutagenic, or teratogenic effects have been documented in animal studies.
- Zinc acetate
- Zinc acetate dihydrate
- Zinc diacetate
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