Monosodium glutamate (MSG) is neither a preservative nor a chemical additive; its precursor is a natural umami substance found in kelp. In 1908, scientists discovered this magical ingredient that enhances the flavor of food in kelp soup, and later achieved large-scale production through fermentation. In soy sauce, it acts like a "flavor amplifier," making the savory and aromatic flavors more complex.
Flavor Harmony: Balances the saltiness of soy sauce with the bitterness produced during fermentation.
Augmented Umami: 1 gram of MSG enhances umami flavor equivalent to 3 grams of natural shiitake mushroom umami.
Process Requirements: Modern low-salt soy sauces have shorter fermentation times, requiring the appropriate addition of natural flavor compounds.
Some people worry that heating will produce harmful substances, but cooking below 120℃ is completely safe. International professional organizations assess that daily consumption amounts are not a concern. What really needs attention is the sodium content of soy sauce; proper control of usage is key. When choosing soy sauce, paying attention to the position of MSG in the ingredient list (the later it appears, the less it's added) is more scientific than simply rejecting it.
