Another name for disodium guanylate is sodium guanylate. It is the sodium salt of guanylic acid. Disodium guanylate is produced from yeast extract or sardines.
Functionality in Food
Disodium guanylate is a flavor enhancer. Guanylates do not have the specific umami taste but strongly enhance many other flavors, thereby reducing the amounts of salt needed in a product.
Disodium guanylate is used in many products.
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To read more about disodium guanylate: wikipedia