Ammonium malate

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.^[1]

Ammonium malate

Names
IUPAC name Diammonium malate
Other names Ammonium hydroxybutanedioate; E349
Identifiers
CAS Number	6283-27-8 Y
ChemSpider	14741352 Y
ECHA InfoCard	100.025.909
EC Number	228-499-2
E number	E349 (antioxidants, ...)
PubChem CID	13644148
UNII	2P5380J2SK Y
CompTox Dashboard (EPA)	DTXSID90889508
Properties
Chemical formula	C4H9NO5
Molar mass	151.118 g·mol−1
Appearance	white solid
Density	1.498 g/cm3 (monohydrate)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

As a food additive, diammonium malate has been used as flavoring agent and as an acidity regulator.^[2] It has the E number E349.^[2]