API reference

Potassium bitartrate

CAS number
868-14-4
Molecular formula
C4H5KO6
Molecular weight
188.18 g/mol
Potassium bitartrate — 2D structure
2D structure (PubChem)

About this molecule

Potassium bitartate, also referred to as potassium acid tartrate or cream of tartar, is the potassium acid salt of l-( + )-tartaric acid. It is obtained as a byproduct of wine manufacture during the fermentation process. Approved by the FDA as a direct food substance, potassium bitartrate is used as an additive, stabilizer, pH control agent, antimicrobial agent, processing aid, or thickener in various food products. Potassium bitartrate has a long history of medical use as a laxative administered as a rectal suppository and is an approved third-class OTC drug in Japan. Potassium bitartrate was one of active ingredients in Phexxi, a non-hormonal contraceptive agent that was approved by the FDA on May 2020.

Source: DrugBank, via PubChem.

Identifiers

IUPAC name
potassium (2R,3R)-2,3,4-trihydroxy-4-oxobutanoate
InChIKey
KYKNRZGSIGMXFH-ZVGUSBNCSA-M
SMILES
[C@@H]([C@H](C(=O)[O-])O)(C(=O)O)O.[K+]
PubChem CID
23681127

Also known as

Potassium bitartrate · Faecula · Faecla · Acid potassium tartrate · POTASSIUM ACID TARTRATE · Monopotassium tartrate · Purified cream of tartar · potassium (2R,3R)-3-carboxy-2,3-dihydroxypropanoate

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