Disodium guanylate
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Disodium guanylate (E627), chemical formula C10H14N5O8P, is a food additive used as a flavor enhancer, in synergy with monosodium glutamate (the sodium salt of glutamic acid, MSG). As it is a fairly expensive additive, it is not used independently of glutamic acid; if disodium guanlyate is present in a list of ingredients but MSG does not appear to be, it is likely that glutamic acid is provided as part of another ingredient such as a processed soy protein complex.
Disodium guanylate is a flavor enhancer derived from dried fish or dried seaweed. It is a by-product of disodium inosinate. It is also known as Flavour enhancer 627 or Flavour Enhancer E627. It is found in instant noodles, potato chips and snacks, savoury rice, tinned vegetables, cured meats, packet soup.