Calcium Citrate

Title: Calcium Citrate
CAS Registry Number: 813-94-5
CAS Name: 2-Hydroxy-1,2,3-propanetricarboxylic acid calcium salt (2:3)
Molecular Formula: C12H10Ca3O14
Molecular Weight: 498.43
Percent Composition: C 28.92%, H 2.02%, Ca 24.12%, O 44.94%
Line Formula: Ca3(C6H5O7)2
Literature References: Prepn from citrus fruit: Cole, US 2389766 (1945 to California Fruit Growers Exchange). Use in foods: R. Labin-Goldscher, S. Edelstein, Food Technol. 50, 96 (1996). Bioavailability compared with calcium carbonate: K. Sakhaee et al., Am. J. Ther. 6, 313 (1999). Clinical effect on bone density: L. A. Ruml et al., ibid. 303; on serum lipid concentrations: I. R. Reid et al., Am. J. Med. 112, 343 (2002).
Derivative Type: Tetrahydrate
CAS Registry Number: 5785-44-4
Trademarks: Calcimax (Gador); Citracal (Mission Pharmacal)
Properties: Odorless powder. Loses most of its water at 100° and all at 120°. Sol in 1050 parts cold water; somewhat more sol in hot water. Insol in alcohol.
Use: In foods as calcium fortifier; as anticaking agent in dry mixes.
Therap-Cat: Calcium supplement.
Keywords: Replenishers/Supplements; Calcium.
Calcium Cyanamide Calcium Cyanamide Citrated Calcium Cyanide Calcium Cyclamate Calcium Dichromate(VI)

Calcium citrate
Calcium citrate
CAS number 813-94-5 N, 5785-44-4 (tetrahydrate)
PubChem 13136
ChemSpider 12584 YesY
EC number 212-391-7
ATC code A12AA13
Jmol-3D images Image 1
Molecular formula Ca3(C6H5O7)2
Molar mass 498.4334 g/mol (anhydrous)
570.49452 g/mol (tetrahydrate)
Appearance White powder
Odor odorless
Density 1.63 g/cm3, solid
Melting point 120 °C (loses water)
Boiling point Decomposes
Solubility in water 0.085 g/100 mL (18 °C)
0.095 g/100 mL (25 °C)
Solubility insoluble in alcohol
MSDS External MSDS
Main hazards Irritant
NFPA 704
NFPA 704.svg
Related compounds
Other cations Sodium citrate
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Calcium citrate is the calcium salt of citric acid. It is commonly used as a food additive (E333), usually as a preservative, but sometimes for flavor. In this sense, it is similar to sodium citrate. Calcium citrate is also used as a water softener because the citrate ions can chelate unwanted metal ions. Calcium citrate is also found in some dietary calcium supplements (e.g. Citracal). Calcium makes up 24.1% of calcium citrate (anhydrous) and 21.1% of calcium citrate (tetrahydrate) by mass.