Calcium alginate
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Description
E404, known as calcium alginate, is a food additive classified as a thickener, gelling agent, and stabilizer. It is obtained from alginic acid, a natural polysaccharide present in the cell walls of brown algae (Phaeophyceae), mainly species of the genera Laminaria, Macrocystis, and Ascophyllum. Industrially, the algae are harvested, washed, and treated with an alkaline solution (sodium carbonate) to extract sodium alginate. Then, this is precipitated with calcium chloride, forming calcium alginate fibers that are dried and ground into a fine powder.
Calcium alginate is insoluble in cold water but swells to form gels in the presence of calcium ions. Its gelling capacity depends on pH and calcium concentration. It acts as a thickener by increasing the viscosity of aqueous solutions, and as a gelling agent by forming thermostable gels that do not melt with heat. It also acts as a stabilizer for emulsions and foams.
Historically, the use of algae as a thickener dates back centuries in Asia, but its industrial production began in the 20th century. In the European Union, calcium alginate has been approved as a food additive since 1974, currently regulated by Regulation (EC) No 1333/2008. The European Food Safety Authority (EFSA) has evaluated its safety several times, most recently in 2017, concluding that there are no safety concerns at the authorized use levels.
The World Health Organization (WHO) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA) have also evaluated it, establishing an Acceptable Daily Intake (ADI) "not specified," meaning it is not considered a health risk in the amounts normally consumed. Regarding labeling, it must appear as "calcium alginate" or "E404" in the ingredient list.
In summary, calcium alginate is a safe and widely used additive in the food industry.
E404 is used in a wide variety of food categories as a thickener, gelling agent, and stabilizer. According to Regulation (EC) No 1333/2008, it is authorized in numerous products, including: cocoa and chocolate products (e.g., chocolate fillings), confectionery (gummies, gumdrops), ice cream, dairy desserts (custards, flans), sauces and condiments (ketchup, mayonnaise), fine bakery products (cakes, tarts), and flavored beverages.
In the Spanish market, it is commonly found in artisanal ice creams, fruit jellies, and industrial bakery products. Maximum use levels vary by category: for example, in ice cream it may be used up to 5000 mg/kg, in confectionery up to 10000 mg/kg, and in sauces up to 5000 mg/kg. Compared to the US FDA, calcium alginate is considered GRAS (Generally Recognized As Safe) and is allowed in foods under good manufacturing practices. Japan also approves it as a thickener without specific limits.
It is important to note that E404 is especially valued for its ability to form thermostable gels, making it ideal for products that require heat stability.
Calcium alginate (E404) is considered safe by major food safety agencies. Toxicological studies have not shown significant adverse effects in humans. EFSA, in its 2017 re-evaluation, concluded that there is no evidence of acute, subchronic, chronic, carcinogenic, genotoxic, or reproductive toxicity. The ADI "not specified" indicates that no harmful effects have been observed even at high intake levels. However, in theory, excessive consumption could have a laxative effect due to alginate's ability to retain water in the intestine, but this has not been documented specifically for calcium alginate.
No sensitive populations or drug interactions have been identified. Compared to other thickeners, calcium alginate has an excellent safety profile. WHO and EFSA agree that there is no public health concern at authorized use levels.
- Calcium alginate
- Calcium alginate salt
- Calcium salt of alginic acid
- Calcium alginate
- Calcium alginate
- Calcium salt of polymannuronate
- Fibrous calcium alginate
- Calcium alginate gum
- Calcium alginate gel
- Precipitated calcium alginate
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