Disodium guanylate
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Disodium guanylate, also known as sodium 5'-guanylate and disodium 5'-guanylate, is a natural sodium salt of the flavor enhancing nucleotide guanosine monophosphate (GMP). Disodium guanylate is a food additive with the E number E627.<ref name=fin>E627 : Sodium guanylate</ref> It is commonly used in conjunction with glutamic acid.
As it is a fairly expensive additive, it is usually not used independently of glutamic acid; if disodium guanylate 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. It is often added to foods in conjunction with disodium inosinate; the combination is known as disodium 5'-ribonucleotides.
Disodium guanylate is produced by fermentation.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> It is often added to instant noodles, potato chips and other snacks, savory rice, tinned vegetables, cured meats, and packaged soup.