Monoammonium glutamate
Score impact
-0.10
points/product
Description
E624, also known as monoammonium glutamate, is a food additive classified as a flavor enhancer. It is the ammonium salt of glutamic acid, a non-essential amino acid naturally present in many foods such as tomatoes, cheeses, or mushrooms. Industrially, it is obtained by bacterial fermentation of molasses or starch, followed by neutralization with ammonia and crystallization.
It is a white crystalline powder, odorless, with a characteristic umami taste. Its main function is to enhance the flavor of foods, especially savory and protein-rich ones, by boosting taste perception. It was discovered in 1908 by Japanese chemist Kikunae Ikeda, although its use as an additive expanded in the second half of the 20th century.
In the European Union, it has been authorized as a food additive since 1995, regulated by Regulation EC 1333/2008. The European Food Safety Authority (EFSA) and the World Health Organization (WHO) have evaluated its safety. EFSA, in its 2017 re-evaluation, established an Acceptable Daily Intake (ADI) of 30 mg/kg body weight per day for all glutamates, including E624.
WHO, through the Joint FAO/WHO Expert Committee on Food Additives (JECFA), also set an ADI of 30 mg/kg/day. Both agencies conclude that E624 is safe for the general population at authorized use levels. No significant adverse effects have been identified in animal or human studies. However, there is controversy regarding a possible link to 'Chinese restaurant syndrome' (headaches, sweating, etc.) in sensitive individuals, although controlled studies have not confirmed a causal association. In labeling, it must appear as 'monoammonium glutamate' or 'E624'.
It is important to note that monoammonium glutamate should not be confused with monosodium glutamate (E621), although both share the same function and safety profile. In summary, E624 is a safe and effective additive widely used in the food industry to enhance product flavor.
E624 is primarily used as a flavor enhancer in a wide variety of processed foods. According to Regulation EC 1333/2008, it is authorized in categories such as soups and broths, sauces, seasonings, snacks, processed meat products, prepared dishes, and cereal-based foods.
In the Spanish market, it is found in brands of instant soups (e.g., Gallina Blanca), meat or vegetable broths (Avecrem), potato chips (Lays, Pringles), tomato sauces (Orlando), and some sausages. Authorized limits vary by category: in soups and broths, up to 10 g/kg; in sauces, up to 10 g/kg; in snacks, up to 5 g/kg; in meat products, up to 5 g/kg.
Compared to the US FDA, E624 is classified as 'Generally Recognized as Safe' (GRAS) and has no specific limits, although good manufacturing practices are recommended. In Japan, monoammonium glutamate is also permitted without quantitative restrictions. The ADI established by EFSA and JECFA is 30 mg/kg/day, equivalent to about 2.1 g per day for a 70 kg person, a level well above typical intake.
Documented side effects of E624 are scarce and inconclusive. EFSA and WHO, after reviewing scientific evidence, conclude that there are no significant adverse effects in the general population when consumed within established limits. However, some individuals may experience symptoms such as headache, sweating, facial flushing, palpitations, or nausea after consuming large amounts of glutamates, a phenomenon known as 'Chinese restaurant syndrome'. Nevertheless, placebo-controlled studies have not consistently reproduced these effects, suggesting that sensitivity is rare and possibly due to other factors.
The proposed biological mechanism involves stimulation of glutamate receptors in the nervous system, but the concentrations required for this are much higher than those achieved through diet. Sensitive populations: people with severe asthma or food allergies may be more susceptible, although there is no solid evidence. Drug interactions: no relevant interactions have been described.
In conclusion, EFSA and WHO consider E624 safe at authorized doses, and potential adverse effects are mild and infrequent.
- Ammonium glutamate
- L-monoammonium glutamate
- L-glutamic acid
- ammonium salt
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