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E622 Monopotassium Glutamate - Flavour Enhancer

E622 is the EU food additive monopotassium glutamate, a flavour enhancer derived from glutamic acid. It intensifies the savoury umami taste in processed foods.

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Things worth knowing about "E622"

E622 is the EU food additive monopotassium glutamate, a flavour enhancer derived from glutamic acid. It intensifies the savoury umami taste in processed foods.

What is E622?

E622 refers to monopotassium glutamate, the potassium salt of glutamic acid. It is an approved food additive in the European Union, used as a flavour enhancer. E622 intensifies the so-called umami taste -- the savoury, meaty fifth basic taste -- making dishes more flavourful and aromatic without adding a pronounced flavour of its own.

Chemical Properties

Monopotassium glutamate is a white, crystalline powder that dissolves readily in water. It is produced by neutralising glutamic acid with potassium hydroxide. Compared to the related additive E621 (monosodium glutamate), E622 contains potassium instead of sodium and is therefore occasionally used as a lower-sodium alternative.

Chemical formula: C₅H₈KNO₄
Appearance: white, crystalline powder
Solubility: readily soluble in water
Taste: mildly salty-savoury (umami)

Use in Food Products

E622 is used by the food industry as a flavour enhancer in a wide variety of processed products. Typical applications include:

Seasonings, soup powders, and stock cubes
Ready meals and frozen food
Snacks, crisps, and savoury biscuits
Sauces, marinades, and dressings
Meat and fish products

Under EU food additive regulation (EC) No 1333/2008, E622 must be declared on the ingredient list as flavour enhancer monopotassium glutamate or as E622.

Mechanism of Action

Glutamate is a salt of glutamic acid, a naturally occurring non-essential amino acid. In the mouth, glutamate binds to specific umami taste receptors (notably the metabotropic glutamate receptor mGluR4 and the T1R1/T1R3 receptor) present on the tongue. This binding amplifies the perception of savoury flavours and increases the overall intensity of the taste experience. As glutamic acid naturally functions as a neurotransmitter in the body, it is metabolised after intestinal absorption and does not typically reach the central nervous system in significant quantities.

Safety and Health Assessment

The European Food Safety Authority (EFSA) has assessed glutamates, including E622. In 2017, EFSA established a group acceptable daily intake (ADI) for glutamic acid and glutamates (E620-E625) of 30 mg per kilogram of body weight per day. Exceeding this value through normal dietary intake is generally unlikely with a balanced diet, but may be possible with high consumption of heavily processed foods.

The so-called Chinese Restaurant Syndrome (symptoms such as headaches, flushing, and nausea after consuming glutamate-containing foods) was historically linked to glutamate. However, controlled scientific studies have not established a clear causal relationship. Sensitive individuals may nonetheless react to larger amounts of glutamate.

Special Considerations

Potassium content: Since E622 contains potassium, individuals with kidney disease or those following a low-potassium diet should monitor their intake of products containing E622.
Labelling: E622 must be listed on food labels in the EU.
Glutamate sensitivity: Individuals who consider themselves sensitive to glutamate should limit their consumption accordingly.

References

European Food Safety Authority (EFSA): Re-evaluation of glutamic acid (E 620), sodium glutamate (E 621), potassium glutamate (E 622), calcium diglutamate (E 623), ammonium glutamate (E 624) and magnesium diglutamate (E 625) as food additives. EFSA Journal 2017;15(7):4910.
European Parliament and Council of the EU: Regulation (EC) No 1333/2008 on food additives. Official Journal of the European Union, 2008.
Fernstrom JD: Monosodium Glutamate in the Diet Does Not Raise Brain Glutamate Concentrations or Cause Neural Damage. Annals of Nutrition and Metabolism, 2018;73(Suppl 5):43-52.

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