E621 Food Additive: Monosodium Glutamate Explained
E621 is the food additive monosodium glutamate (MSG), widely used as a flavor enhancer in ready meals, soups, snacks, and seasoning products.
Things worth knowing about "E621 food additive"
E621 is the food additive monosodium glutamate (MSG), widely used as a flavor enhancer in ready meals, soups, snacks, and seasoning products.
What is E621?
E621 is the official EU designation for monosodium glutamate, commonly known as MSG. It is the sodium salt of glutamic acid, a naturally occurring amino acid found in many protein-rich foods. In the food industry, E621 is used as a flavor enhancer, particularly in Asian cuisine, processed foods, instant soups, chips, and seasoning blends. It intensifies the so-called umami taste – one of the five basic tastes, often described as savory or meaty.
Origin and Production
Monosodium glutamate was first isolated in 1908 by Japanese chemist Kikunae Ikeda from seaweed. Today, E621 is produced industrially through microbial fermentation, similar to the production of vinegar or yogurt. Common raw materials include sugar beets, sugarcane, and starch.
Glutamic acid also occurs naturally in many everyday foods, including:
- Tomatoes
- Parmesan and other aged cheeses
- Mushrooms
- Soy sauce
- Meat and fish
Use in the Food Industry
E621 is added to food products to intensify their flavor without the need for additional salt or fat. Common products that may contain E621 include:
- Instant noodles and ready-made soups
- Chips and salty snacks
- Seasoning mixes and stock cubes
- Fast food products
- Canned vegetables and sauces
Within the EU, E621 is approved for specific food categories and must be declared on the ingredient list under the name monosodium glutamate or the code E621.
Mechanism of Action
Glutamate binds to specific taste receptors on the tongue (known as mGluR receptors) that detect the umami flavor. This taste signals to the brain the presence of proteins in food. By activating these receptors, E621 enhances the overall taste experience, making dishes taste fuller and more savory.
Safety and Health Assessment
According to current scientific evidence, E621 is considered safe when consumed in typical dietary amounts. The European Food Safety Authority (EFSA) has established an acceptable daily intake (ADI) of 30 mg per kilogram of body weight.
In the past, E621 was associated with the so-called Chinese Restaurant Syndrome – a set of symptoms including headaches, heart palpitations, sweating, and a tingling sensation in the face after consuming high-MSG meals. However, scientific studies have not confirmed a clear causal link between MSG at typical dietary levels and these symptoms. Sensitive individuals may still wish to limit their intake.
Possible Symptoms With Excessive Consumption
- Headaches
- Tingling or numbness in the face
- Heart palpitations
- Sweating
- Nausea or general discomfort
These symptoms generally only occur with very high amounts and in particularly sensitive individuals and are not considered dangerous.
Labeling Requirements in the EU
Under EU Regulation (EC) No. 1333/2008 on food additives, E621 must be listed in the ingredient list of any product in which it is used. Products containing glutamates (E620–E625) intended for infants and young children must also carry the statement that they contain a source of phenylalanine, and flavor enhancer use must be clearly indicated for sensitive consumer groups.
References
- European Food Safety Authority (EFSA): Re-evaluation of glutamic acid (E 620), sodium glutamate (E 621) as food additives. EFSA Journal, 2017. Available at: https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2017.4910
- Regulation (EC) No. 1333/2008 of the European Parliament and of the Council on food additives. Official Journal of the European Union, 2008.
- Jinap S., Hajeb P.: Glutamate. Its applications in food and contribution to health. Appetite, 2010; 55(1): 1–10. PubMed PMID: 20493900.
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