Potassium malate

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Potassium malate
Potassium malate.svg
IUPAC name
dipotassium 2-hydroxybutanedioate
Other names
Dipotassium malate; E351
  • 585-09-1 checkY
3D model (JSmol)
ECHA InfoCard 100.008.683 Edit this at Wikidata
E number E351 (antioxidants, ...)
  • InChI=1S/C4H6O5.2K/c5-2(4(8)9)1-3(6)7;;/h2,5H,1H2,(H,6,7)(H,8,9);;/q;2*+1/p-2 ☒N
  • InChI=1/C4H6O5.2K/c5-2(4(8)9)1-3(6)7;;/h2,5H,1H2,(H,6,7)(H,8,9);;/q;2*+1/p-2
  • C(C(C(=O)[O-])O)C(=O)[O-].[K+].[K+]
Molar mass 210.268 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Potassium malate is a compound with formula K2(C2H4O(COO)2). It is the potassium salt of malic acid.

As a food additive, it has the E number E351. It is used as acidity regulator or acidifier for use in, for example, canned vegetables, soups, sauces, fruit products and soft drinks. It also acts as an antioxidant and as a food flavor. It is an important compound in the transport of nitrate from the roots of a plant to the leaves of the plant. Potassium malate is the salt that transports from the leaves to the root. At the root the potassium maleate oxidizes to potassium carbonate, then is converted to potassium nitrate by soil nitrate and transported back to the leaves.