Calcium Saccharate:

Calcium Saccharate USP

C6H8CaO8·4H2O 320.26
D-Glucaric acid, calcium salt (1:1) tetrahydrate.
Calcium D-glucarate (1:1), tetrahydrate [5793-89-5].

Calcium Saccharate is the calcium salt of D-saccharic acid. It contains not less than 98.5 percent and not more than 102.0 percent of C6H8CaO8·4H2O.

Identification—
A: Dissolve about 0.2 g in 10 mL of water by the addition of 2 mL of hydrochloric acid: the solution so obtained responds to the tests for Calcium.
B: Infrared Absorption 197M.
Specific rotation: between +18.5 and +22.5.
Test solution: 60 mg per mL, in 4.8 N hydrochloric acid that has been allowed to stand for 1hour.
Chloride— A 0.50-g portion dissolved in 10 mL of water by the addition of 2 mL of nitric acid shows no more chloride than corresponds to 0.50 mL of 0.020 N hydrochloric acid (0.07%).
Sulfate— A 0.50-g portion dissolved in 10 mL of water by the addition of 2 mL of hydrochloric acid shows no more sulfate than corresponds to 0.60 mL of 0.020 N sulfuric acid (0.12%).
Heavy metals: 0.002%