monosodium glutamate

Monosodium glutamate (MSG) is the sodium salt of glutamic acid, a naturally occurring amino acid. First isolated from kombu kelp broth in Japan in 1908, MSG is now produced commercially through fermentation of grains, sugar cane, or petroleum by-products using Corynebacterium glutamicum bacteria. The crystalline white powder dissolves readily in water and has no flavor of its own; rather, it enhances the savory taste perception of foods by stimulating umami taste receptors on the tongue. Umami, the fifth basic taste, is characterized as meaty, brothy, or savory.

MSG occurs naturally in fermented and aged foods such as soy sauce, Parmesan cheese, tomatoes, and mushrooms. The compound comprises approximately 10-20% sodium by weight, with the remainder being glutamate.

MSG is widely used in Asian cuisines—particularly Chinese, Japanese, Korean, and Vietnamese cooking—as a flavor enhancer in soups, broths, stir-fries, and seasoning blends. It is also incorporated into processed foods, snacks, bouillon cubes, and commercial seasonings worldwide. A small quantity (0.1-0.5% by weight) can intensify umami notes without imparting a recognizable MSG flavor. It pairs effectively with savory dishes, meats, seafood, and vegetable preparations. In professional kitchens, MSG serves as an alternative or complement to long-simmered stocks and broths, reducing cooking time while maintaining depth of flavor.