Calcium chloride
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Description
Calcium chloride (E509) is a food additive used mainly as a stabilizer, firming agent, sequestrant, and salt flavor enhancer. It is an inorganic salt of calcium and chlorine, with the formula CaCl2, appearing as a white, odorless, highly hygroscopic solid. Industrially, it is obtained as a byproduct of the Solvay process for sodium carbonate production, or by reacting hydrochloric acid with calcium carbonate.
It can be obtained by purifying natural brines. Its physicochemical properties include high solubility in water (74.5 g/100 mL at 20 °C), a salty and bitter taste, and the ability to release heat when dissolved (exothermic reaction). As an additive, E509 acts as a stabilizer by forming cross-links with pectins and proteins, improving the texture of canned fruits and vegetables, cheeses, and meat products. It is also used to adjust water hardness in brewing and to prevent discoloration of certain vegetables.
Its history as an additive dates back to the early 20th century, and it was approved in the European Union after evaluations by the Scientific Committee for Food (SCF) and subsequently by the European Food Safety Authority (EFSA). In its 2019 re-evaluation, EFSA established an Acceptable Daily Intake (ADI) of 0-20 mg/kg body weight per day for calcium from all sources, including calcium chloride. The World Health Organization (WHO) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA) have also evaluated calcium chloride, assigning a similar ADI.
Regarding food safety, E509 is considered safe at authorized use levels, with no significant adverse effects identified in humans. Labeling must include the name 'calcium chloride' or its E number E509 in the ingredient list. In summary, E509 is a versatile and well-established additive, supported by decades of safe use and rigorous scientific evaluations.
E509 is used in a wide variety of food categories according to Regulation EC 1333/2008. Its main uses include: as a firming agent in canned fruits and vegetables (olives, pickles, peppers), where it helps maintain firmness; in processed cheeses and cottage cheese to improve texture and coagulation; in meat products such as sausages and pâtés to stabilize emulsions; in isotonic drinks and juices to adjust mineral balance; and in brewing to correct water hardness.
In the Spanish market, it is commonly found in stuffed olives, canned vegetables, sliced processed cheeses, and sports drinks. Authorized limits vary by category: for example, in canned fruits and vegetables up to 350 mg/kg (expressed as calcium), in processed cheeses up to 900 mg/kg, and in isotonic drinks up to 200 mg/L. Compared to the US FDA, calcium chloride is classified as GRAS (Generally Recognized as Safe) and is allowed in similar amounts. In Japan, it is also approved as a food additive with analogous restrictions.
The versatility of E509 makes it a key ingredient for the food industry, especially in products requiring texture improvement and stability.
Calcium chloride (E509) is considered safe in the amounts used as a food additive. EFSA, in its 2019 re-evaluation, concluded that there are no safety concerns for the general population at estimated exposure levels. However, excessive intake of calcium (from all sources) can cause hypercalcemia, which manifests as nausea, vomiting, constipation, muscle weakness, and in severe cases, cardiac arrhythmias. The established ADI (0-20 mg/kg/day for total calcium) is well above typical exposure through E509. Sensitive populations include people with kidney failure, as they may have difficulty excreting excess calcium, and those with calcium metabolism disorders (such as hyperparathyroidism).
No significant drug interactions with E509 at dietary levels have been documented, although high calcium intake may interfere with the absorption of certain antibiotics (tetracyclines) and the efficacy of thiazide diuretics. WHO and JECFA also support its safety, noting that no adverse effects have been observed in chronic toxicity studies. In conclusion, E509 is a safe additive when consumed within established limits, and possible side effects are only associated with intakes far higher than those obtained through the diet.
- Calcium chloride
- Calcium chloride anhydrous
- Calcium chloride dihydrate
- Calcium salt
- Brine salt
- Technical calcium chloride
- Calcium coagulation activator
- CaCl2
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