Gamma-tocopherol
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Description
E308, known as gamma-tocopherol, is a form of vitamin E that acts as an antioxidant in foods. It belongs to the group of tocopherols, fat-soluble compounds that protect fats from oxidation. Gamma-tocopherol occurs naturally in vegetable oils such as soybean, corn, and rapeseed oil, as well as in nuts and seeds. Industrially, it is obtained by molecular distillation from vegetable oils rich in tocopherols, followed by purification.
It is an oily liquid ranging from light yellow to brown, soluble in fats and oils, and insoluble in water. Its main function is to prevent lipid rancidity, extending the shelf life of foods. The history of its use as an additive dates back to the mid-20th century, when its antioxidant capacity was recognized.
In the European Union, E308 is approved as a food additive under Regulation (EC) No 1333/2008, and has been evaluated by the European Food Safety Authority (EFSA) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA). EFSA established an acceptable daily intake (ADI) of 0.15-2 mg/kg body weight for mixed tocopherols, although gamma-tocopherol alone does not have a specific ADI due to its low toxicity. The overall safety assessment is favorable, considering it safe at authorized doses.
On labels, it appears as "gamma-tocopherol" or "E308". It is important to note that gamma-tocopherol is a form of vitamin E, but its biological activity is lower than that of alpha-tocopherol. However, its antioxidant function in foods is comparable. The food safety of E308 is supported by decades of use and toxicological studies that have not shown significant adverse effects in humans.
E308 is mainly used as an antioxidant in fat-rich foods to prevent oxidation and rancidity. According to Regulation EC 1333/2008, it is authorized in a wide range of food categories, such as vegetable oils and fats (except virgin olive oil), fine bakery products, breakfast cereals, soups and broths, sauces, processed nuts, and food supplements. Maximum limits vary by product: for example, in vegetable oils up to 300 mg/kg (expressed as total tocopherols) is allowed, while in biscuits and cakes the limit is 200 mg/kg.
In the Spanish market, it is found in sunflower, corn, and soybean oils, margarines, potato chips, fried or roasted nuts, and industrial pastries. Compared to the US FDA, gamma-tocopherol is recognized as GRAS (Generally Recognized as Safe) and used without specific limits, following good manufacturing practices. In Japan, it is also approved as an antioxidant with limits similar to European ones.
The versatility of E308 allows its use in combination with other antioxidants such as E306 (tocopherol-rich extract) or E307 (alpha-tocopherol) to improve oxidative stability.
Gamma-tocopherol (E308) is considered safe at the doses used as a food additive. Toxicological studies have not documented significant adverse effects in humans. At very high doses (vitamin E supplements), a possible increased risk of bleeding due to its anticoagulant effect has been observed, but this is not relevant for the amounts present in foods.
The biological mechanism of gamma-tocopherol includes scavenging free radicals, protecting cell membranes. However, unlike alpha-tocopherol, gamma-tocopherol has lower vitamin E activity and may be metabolized more quickly. Sensitive populations such as people with coagulation disorders or those taking anticoagulants (warfarin) should exercise caution with high doses of supplements, but not with dietary amounts.
EFSA concluded that there is no safety concern for the general population at authorized use levels. JECFA also established an acceptable daily intake (ADI) for mixed tocopherols of 0.15-2 mg/kg body weight, with no observed adverse effects. No significant drug interactions have been reported with consumption of E308 in foods.
In summary, gamma-tocopherol is a safe and well-tolerated antioxidant.
- Gamma-tocopherol
- Vitamin E (gamma)
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