Potassium malate

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Potassium malate
Potassium malate.svg
Names
IUPAC name
dipotassium 2-hydroxybutanedioate
Other names
Dipotassium malate; E351
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.008.683 OOjs UI icon edit-ltr-progressive.svg
E number E351 (antioxidants, ...)
PubChem CID
UNII
  • 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 X mark.svgN
    Key: SVICABYXKQIXBM-UHFFFAOYSA-L X mark.svgN
  • 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
    Key: SVICABYXKQIXBM-NUQVWONBAI
  • C(C(C(=O)[O-])O)C(=O)[O-].[K+].[K+]
Properties
C4H4K2O5
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).
X mark.svgN  verify  (what is  Yes check.svgYX mark.svgN ?)

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. [1] 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 a food flavoring agent.

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 malate oxidizes to potassium carbonate, then is converted to potassium nitrate by soil nitrate and transported back to the leaves.[ citation needed ]

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E350 is an EU recognised food additive. It comes in two forms,

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Ammonium malate refers to organic compounds containing malate and ammonium. Two stoichiometries are discussed: NH4H(C2H3OH(CO2)2) with one ammonium ion per formula unit, and (NH4)2(C2H3OH(CO2)2). Malate, the conjugate base of malic acid, is chiral. Consequently a variety of salts are possible, R vs S vs racemic. The monoammonium salt has been crystallized as the monohydrate.

<span class="mw-page-title-main">Sodium malate</span> Chemical compound

Sodium malate is a compound with formula Na2(C2H4O(COO)2). It is the sodium salt of malic acid. As a food additive, it has the E number E350.

<span class="mw-page-title-main">Calcium malate</span> Chemical compound

Calcium malate is a compound with formula Ca(C2H4O(COO)2). It is the calcium salt of malic acid. As a food additive, it has the E number E352.

References

  1. "Approved additives and E numbers". UK Food Standards Agency.