Ammonium malate

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| IUPACName = Diammonium malate

| OtherNames = Ammonium hydroxybutanedioate; E349

|Section1={{Chembox Identifiers

| CASNo = 6283-27-8

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| UNII = 2P5380J2SK

| PubChem = 13644148

| EC_number = 228-499-2

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| ChemSpiderID = 14741352

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|Section2={{Chembox Properties

| C=4 | H=9 | N=1 | O=5

| Appearance = white solid

| Density = 1.498 g/cm³ (monohydrate)

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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.{{cite journal |doi=10.1016/j.jcrysgro.2007.12.024|title=Synthesis, crystal growth, structural, optical, thermal and mechanical properties of novel organic NLO material: Ammonium malate|year=2008|last1=Anandha Babu|first1=G.|last2=Bhagavannarayana|first2=G.|last3=Ramasamy|first3=P.|journal=Journal of Crystal Growth|volume=310|issue=6|pages=1228–1238|bibcode=2008JCrGr.310.1228A}}

As a food additive, diammonium malate has been used as flavoring agent and as an acidity regulator.{{cite web | url = https://www.fao.org/fao-who-codexalimentarius/sh-proxy/en/?lnk=1&url=https%253A%252F%252Fworkspace.fao.org%252Fsites%252Fcodex%252FStandards%252FCXG%2B36-1989%252FCXG_036e.pdf | title = Class Names and the International Numbering System for Food Additive | publisher = Food and Agriculture Organization of the United Nations }} It has the E number E349.