Ammonium malate

Ammonium malate
Names
	IUPAC name Diammonium malate
	Other names Ammonium hydroxybutanedioate; E349
Identifiers
CAS Number	6283-27-8 ;
ChemSpider	14741352 ;
ECHA InfoCard	100.025.909
EC Number	228-499-2;
E number	E349 (antioxidants, ...)
PubChem CID	13644148;
UNII	2P5380J2SK ;
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). verify (what is ?) Infobox references

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]

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]

References

^ Anandha Babu, G.; Bhagavannarayana, G.; Ramasamy, P. (2008). "Synthesis, crystal growth, structural, optical, thermal and mechanical properties of novel organic NLO material: Ammonium malate". Journal of Crystal Growth. 310 (6): 1228–1238. Bibcode:2008JCrGr.310.1228A. doi:10.1016/j.jcrysgro.2007.12.024.
^ ^a ^b "Class Names and the International Numbering System for Food Additive" (PDF). Food and Agriculture Organization of the United Nations.