Monosodium glutamate, E 621 or Sodium Glutamate (IUPAC name- 2-Aminopentanedioic acid,2-Aminoglutaric acid,1-Aminopropane-1,3-dicarboxylic acid), commonly known as MSG, is a salt of sodium with glutamic acid. It is best known for its use as a flavour enhancer. In its pure form it appears as a white crystalline powder; when dissolved in water (or saliva) it rapidly dissociates into free sodium and glutamate ions.

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