API reference
Potassium bitartrate
- CAS number
- 868-14-4
- Molecular formula
- C4H5KO6
- Molecular weight
- 188.18 g/mol

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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