Malic acid

| data page pagename = | ImageFile = Äpfelsäure3.svg | ImageSize = 180px | ImageAlt = | ImageName = Skeletal structure | ImageCaption = | ImageFile1 = Malic-acid-3D-balls.png | ImageSize1 = | ImageAlt1 = | ImageName1 = Ball-and-stick model | ImageCaption1 = | ImageFile2 = Sample of racemic malic acid.jpg | ImageSize2 = 250px | ImageAlt2 = | ImageName2 = | ImageCaption2 = DL-Malic acid | ImageFile3 = | ImageSize3 = | ImageAlt3 = | ImageName3 = | ImageFileL1 = | ImageSizeL1 = | ImageAltL1 = | ImageNameL1 = | ImageFileR1 = | ImageSizeR1 = | ImageAltR1 = | ImageNameR1 = | ImageFileL2 = | ImageSizeL2 = | ImageAltL2 = | ImageNameL2 = | ImageFileR2 = | ImageSizeR2 = | ImageAltR2 = | ImageNameR2 = | Section1 = | UNII = 817L1N4CKP | KEGG_Ref = | KEGG = C00711 | KEGG1 = C00497 | KEGG1_Comment = D-(+) | KEGG2 = C00149 | KEGG2_Comment = L-(–) | ChEMBL_Ref = | ChEMBL = 1455497 | InChI = 1/C4H6O5/c5-2(4(8)9)1-3(6)7/h2,5H,1H2,(H,6,7)(H,8,9) | InChIKey = BJEPYKJPYRNKOW-UHFFFAOYAM | ChEBI_Ref = | ChEBI = 6650 | ChEBI1 = 30796 | ChEBI1_Comment = D-(+) | ChEBI2 = 30797 | ChEBI2_Comment = L-(–) | SMILES = O=C(O)CC(O)C(=O)O | StdInChI_Ref = | StdInChI = 1S/C4H6O5/c5-2(4(8)9)1-3(6)7/h2,5H,1H2,(H,6,7)(H,8,9) | StdInChIKey_Ref = | StdInChIKey = BJEPYKJPYRNKOW-UHFFFAOYSA-N | CASNo_Ref = | CASNo = 6915-15-7 | ChemSpiderID_Ref = | ChemSpiderID = 510 | ChemSpiderID1_Ref = | ChemSpiderID1 = 83793 | ChemSpiderID1_Comment = D-(+)-malic acid | ChemSpiderID2_Ref = | ChemSpiderID2 = 193317 | ChemSpiderID2_Comment = L-(–)-malic acid | EINECS = 230-022-8 }} | Section2 =
p''K''_a3 = 14.5 | pKb = | Solubility = 558 g/L (at 20 °C) | SolubleOther = | Solvent = | VaporPressure = }} | Section3 = | Section4 = | Section5 = | Section6 = | Section7 = | LD50 = | LC50 = | MainHazards = | NFPA-F = | NFPA-H = | NFPA-R = | NFPA-S = | PEL = | REL = | ExternalSDS = | GHSPictograms = | GHSSignalWord = | HPhrases = | PPhrases = }} | Section9 = }}

Malic acid is an organic compound with the molecular formula . It is a dicarboxylic acid that is made by all living organisms, contributes to the sour taste of fruits, and is used as a food additive. Malic acid has two stereoisomeric forms (L- and D-enantiomers), though only the L-isomer exists naturally. The salts and esters of malic acid are known as malates. The malate anion is a metabolic intermediate in the citric acid cycle. Provided by Wikipedia