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Pyrophosphate, also known as diphosphoric acid or ppi, is a member of the class of compounds known as non-metal pyrophosphates. Non-metal pyrophosphates are inorganic non-metallic compoundscontaining a pyrophosphate as its largest oxoanion. Pyrophosphate can be found in a number of food items such as bitter gourd, babassu palm, groundcherry, and black crowberry, which makes pyrophosphate a potential biomarker for the consumption of these food products. Pyrophosphate can be found primarily in blood, saliva, and urine, as well as throughout most human tissues. Pyrophosphate exists in all living organisms, ranging from bacteria to humans. In humans, pyrophosphate is involved in several metabolic pathways, some of which include cardiolipin biosynthesis CL(18:0/16:1(9Z)/16:1(9Z)/16:0), cardiolipin biosynthesis cl(i-13:0/a-17:0/i-18:0/a-17:0), cardiolipin biosynthesis cl(i-12:0/i-16:0/a-15:0/a-25:0), and cardiolipin biosynthesis cl(a-13:0/i-24:0/i-22:0/i-14:0). Pyrophosphate is also involved in several metabolic disorders, some of which include hyperinsulinism-hyperammonemia syndrome, methionine adenosyltransferase deficiency, mevalonic aciduria, and g(m2)-gangliosidosis: variant B, tay-sachs disease. Pyrophosphate is a non-carcinogenic (not listed by IARC) potentially toxic compound. In chemistry, a pyrophosphate is a phosphorus oxyanion. Compounds such as salts and esters are also called pyrophosphates. The group is also called diphosphate or dipolyphosphate, although this should not be confused with phosphates. As a food additive, diphosphates are known as E450. A number of hydrogen pyrophosphates also exist, such as Na2H2P2O7, as well as the normal pyrophosphates .

An inorganic anionic group that is the trianionic form of diphosphate group arising from deprotonation of the phosphate OH groups." []