Metatartaric acid

Metatartaric acid
	Idealized chemical structure of metartaric acid
Names
	Other names E353
Identifiers
CAS Number	39469-81-3 (unspecified form); 56959-20-7 (polyether form);
3D model (JSmol)	Interactive image;
ChemSpider	32820791;
ECHA InfoCard	100.116.846
EC Number	609-694-5;
E number	E353 (antioxidants, ...)
PubChem CID	92024228;
	InChI InChI=1S/C8H8O10/c9-1(5(11)12)3-7(15)18-4(8(16)17-3)2(10)6(13)14/h1-4,9-10H,(H,11,12)(H,13,14) Key: KWBYTEOPKORPPY-UHFFFAOYSA-N;
	SMILES C1(C(=O)OC(C(=O)O1)C(C(=O)O)O)C(C(=O)O)O;
Properties
Chemical formula	(C4H4O5)n
Molar mass	Variable
Appearance	Off-white solid
Solubility in water	Freely soluble
Solubility in ethanol	Soluble
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Metatartaric acid is a food additive. Chemically, it is a polymeric lactone of variable composition and different molecular weights obtained through a dehydration reaction by heating tartaric acid.^[2]

References