Calcium gluconate
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Description
Calcium gluconate (E578) is a food additive primarily used as a stabilizer, sequestrant, and acidity regulator. It is the calcium salt of gluconic acid, an organic acid naturally found in fruits, honey, and wine. Industrially, it is obtained by aerobic fermentation of glucose by microorganisms of the genus Aspergillus niger, followed by neutralization with calcium carbonate or calcium hydroxide.
The resulting product is a white crystalline powder, odorless and with a slightly bitter taste. It is soluble in water and practically insoluble in ethanol. Its main function in foods is to chelate metal ions (sequestrant), preventing oxidation reactions and turbidity, and it also acts as a texture stabilizer in dairy products and beverages. Additionally, it provides calcium, which can be beneficial from a nutritional standpoint.
Calcium gluconate was approved as a food additive in the European Union following evaluations by the Scientific Committee for Food (SCF) and subsequently by the European Food Safety Authority (EFSA). EFSA, in its 2016 re-evaluation, established an Acceptable Daily Intake (ADI) of 0-50 mg/kg body weight for gluconic acid and its salts, expressed as gluconic acid.
The World Health Organization (WHO) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA) have also evaluated calcium gluconate, assigning an ADI of 0-50 mg/kg bw. Both agencies conclude that there are no safety concerns at authorized use levels. Regarding labeling, it must appear in the ingredient list as 'calcium gluconate' or 'E578'.
In summary, calcium gluconate is a safe and well-tolerated food additive with useful technological functions and an additional calcium contribution.
Calcium gluconate (E578) is used in various food categories according to Regulation EC 1333/2008. It is used as a stabilizer in dairy products such as yogurts, dairy desserts, and ice cream, where it helps maintain texture and prevent syneresis. It also acts as a sequestrant in soft drinks, fruit juices, and nectars, preventing turbidity and oxidation. In canned fruits and vegetables, it helps maintain firmness. In bakery and pastry products, it can be used as an acidity regulator and dough improver.
In the Spanish market, it is found in brands of yogurts, dairy desserts, ice cream, isotonic drinks, and packaged juices. Authorized limits vary by category: for example, in soft drinks up to 300 mg/L, in dairy desserts up to 500 mg/kg, and in canned fruits up to 350 mg/kg. The US FDA classifies calcium gluconate as GRAS (Generally Recognized as Safe) and allows its use in foods without specific limits, provided good manufacturing practices are followed. In Japan, it is also permitted as a food additive with restrictions similar to European ones.
Documented adverse effects of calcium gluconate are rare and generally mild. In animal studies, no significant toxic effects were observed even at high doses. In humans, excessive calcium intake can cause hypercalcemia, but the amounts contributed by the additive are far below those that would cause problems.
EFSA and JECFA have concluded that there is no evidence of carcinogenic, genotoxic, or reproductive effects. Sensitive populations such as people with kidney failure or calcium metabolism disorders should monitor their total calcium intake, but the additive contributes minimally. No relevant drug interactions have been described with calcium gluconate as an additive. In summary, E578 is considered safe at authorized doses, and no significant side effects have been reported in the general population.
- Calcium gluconate
- Calcium gluconate
- Calcium salt of gluconic acid
- Calcium gluconate
- Calcium gluconate
- Calcii gluconas
- D-calcium gluconate
- Calcium salt of D-gluconic acid
- Calcium gluconate monohydrate
- Functional calcium gluconate
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