Calcium citrate

Calcium citrate

2D structure of calcium citrate

Calcium citrate tetrahydrate[1]

Calcium citrate tetrahydrate
Names
IUPAC name
2-hydroxy-1,2,3-propane-tricarboxylic acid calcium salt (2:3)
Other names
E333, tricalcium dicitrate
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.011.265 Edit this at Wikidata
EC Number
  • 212-391-7
E number E333 (antioxidants, ...)
UNII
  • InChI=1S/2C6H8O7.3Ca/c2*7-3(8)1-6(13,5(11)12)2-4(9)10;;;/h2*13H,1-2H2,(H,7,8)(H,9,10)(H,11,12);;;/q;;3*+2/p-6 checkY
    Key: FNAQSUUGMSOBHW-UHFFFAOYSA-H checkY
  • InChI=1/2C6H8O7.3Ca/c2*7-3(8)1-6(13,5(11)12)2-4(9)10;;;/h2*13H,1-2H2,(H,7,8)(H,9,10)(H,11,12);;;/q;;3*+2/p-6
    Key: FNAQSUUGMSOBHW-CYFPFDDLAZ
  • [Ca+2].[Ca+2].[Ca+2].O=C([O-])CC(O)(C([O-])=O)CC(=O)[O-].[O-]C(=O)C(O)(CC([O-])=O)CC([O-])=O
Properties
Ca3(C6H5O7)2
Molar mass 498.4334 g/mol (anhydrous)
570.4945 g/mol (tetrahydrate)
Appearance White powder
Odor odorless
Density 1.63 g/cm3 (anhydrous)
2.00 g/cm3 (tetrahydrate)[1]
Melting point Decomposes
Boiling point Decomposes
0.85 g/L (18 °C)
0.95 g/L (25 °C)
Solubility insoluble in alcohol
Structure
Triclinic (tetrahydrate)
P1, No. 2
a = 0.59466(4) nm, b = 1.02247(8) nm, c = 1.66496(13) nm
α = 72.213(7)°, β = 79.718(7)°, γ = 89.791(6)°[1]
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Irritant
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
1
0
Related compounds
Other cations
 Magnesium citrate
Strontium citrate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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 found in some dietary calcium supplements (e.g. Citracal or Caltrate). Calcium makes up 24.1% of calcium citrate (anhydrous) and 21.1% of calcium citrate (tetrahydrate) by mass. The tetrahydrate occurs in nature as the mineral Earlandite.

  1. ^ a b c Cite error: The named reference str was invoked but never defined (see the help page).