Tragacanth
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Description
The food additive E413, known as tragacanth, is a natural thickener, stabilizer, and emulsifier obtained from the dried exudate of several species of shrubs of the genus Astragalus, mainly Astragalus gummifer and Astragalus microcephalus, native to arid regions of the Middle East and Asia Minor.
Industrially, it is collected by making incisions in the bark of branches and trunk, from which a gummy exudate flows and dries in the sun. Subsequently, it is ground into a fine white or yellowish powder. Chemically, tragacanth is a complex polysaccharide composed of two main fractions: tragacanthin (water-soluble, responsible for viscosity) and tragacanthic acid (insoluble but swells in water forming a gel).
It is stable over a wide pH range (4-8) and resistant to acid hydrolysis, making it suitable for acidic foods. Its main function is to thicken, stabilize emulsions, and suspend solid particles. Tragacanth has been used since ancient times in traditional medicine and as a thickener in cooking.
In the European Union, it was approved as a food additive after evaluations by EFSA and the Joint FAO/WHO Expert Committee on Food Additives (JECFA). EFSA established an Acceptable Daily Intake (ADI) 'not specified', meaning it is not considered a health risk at the levels used in foods. WHO also classifies it as safe. Regarding food safety, tragacanth is not absorbed in the gastrointestinal tract and is excreted unchanged, so it provides no calories and does not affect metabolism.
On labeling, it must appear as 'tragacanth gum' or 'E413'. It is important to note that although it is safe for the general population, some individuals may experience mild allergic reactions.
Overall, tragacanth is considered a safe and natural additive with a long history of use.
E413 is used in a wide variety of food categories according to Regulation EC 1333/2008. It is used as a thickener, stabilizer, and emulsifier in products such as sauces, dressings, mayonnaises, dairy products (yogurts, ice creams), bakery (fillings, glazes), beverages (nectars, juices), and processed meat products.
In the Spanish market, it can be found in sauce brands like 'Hellmann's' or 'Kraft', in artisanal ice creams, and in industrial bakery products. Authorized limits vary by category: for example, in emulsified sauces up to 10 g/kg, in cocoa and chocolate products up to 5 g/kg, and in flavored beverages up to 1 g/kg. Compared to the FDA, which also considers it GRAS (Generally Recognized as Safe), uses are similar, although the FDA does not set specific quantitative limits. In Japan, tragacanth is approved as a food additive with similar restrictions.
It is important to note that its use has declined in favor of other cheaper gums such as xanthan gum (E415), but it is still valued for its stability in acidic media.
Documented side effects of tragacanth are rare and generally mild. EFSA and WHO conclude that it is safe for the general population at the levels used in foods. Being an indigestible soluble fiber, it may cause mild gastrointestinal discomfort such as gas or bloating if consumed in large amounts, but this is not common at authorized use levels.
Rare cases of allergic reactions have been reported, especially in individuals sensitive to other plant gums or with allergy to Astragalus pollen. Symptoms may include urticaria, rhinitis, or asthma.
No significant interactions with medications are known, although theoretically it could reduce absorption of some drugs if consumed in very high doses, but there is no relevant clinical evidence. The ADI 'not specified' indicates that no adverse effects have been observed in animal studies even at high doses.
In conclusion, tragacanth is considered a safe additive with a favorable toxicological profile.
- Tragacanth gum
- INS 413
- Astragalus gum
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