Ammonium malate

Ammonium malate
Names
IUPAC name
Diammonium malate
Other names
Ammonium hydroxybutanedioate; E349
Identifiers
ChemSpider
ECHA InfoCard 100.025.909 Edit this at Wikidata
EC Number
  • 228-499-2
E number E349 (antioxidants, ...)
UNII
Properties
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).
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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.[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

  1. ^ 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.
  2. ^ a b "Class Names and the International Numbering System for Food Additive" (PDF). Food and Agriculture Organization of the United Nations.


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