Calcium tartrate is a byproduct of the wine industry, prepared from wine fermentation dregs. It is the calcium salt of tartaric acid, an acid most commonly found in grapes. Its solubility decreases with lower temperature, which results in the forming of whitish (in red wine often reddish) crystalline clusters as it precipitates. It finds use as a food preservative and acidity regulator. Like tartaric acid, calcium tartrate has two asymmetric carbons, hence it has two chiral isomers and a non-chiral isomer (meso-form). Most calcium tartrate of biological origin is the chiral levorotatory (–) isomer.

CAS：5892-21-7
中文别名：
英文别名：Lg-Weinsaeure,Calciumtartrat;Lg-tartaric acid,calcium-Lg-tartrate;Lg-Weinsaeure,Calcium-Salz;
分子式：C4H4CaO6
分子量：188.149
精确质量：187.963
Psa：120.72
Logp：-4.792