Packaging and storage—
Preserve in single-dose containers, preferably of Type I glass, protected from light.
Labeling—
Label containers of Injection intended for intravascular injection to direct the user to discard any unused portion remaining in the container. Label containers of Injection intended for other than intravascular injection to indicate that the contents are not intended for intravascular injection.
Identification—
A:
It responds to
Identification test
A under
Ioxaglic Acid, a solution of 1.7 mL of Injection in 100 mL of water being used as the test solution.
B:
Evaporate a volume of Injection, equivalent to about 500 mg of ioxaglate meglumine and ioxaglate sodium, to dryness, and heat the residue so obtained in a crucible: violet vapors are evolved.
Heavy metals—
Test solution—
Transfer a volume of Injection, equivalent to a total of 1.0 g of ioxaglate meglumine and ioxaglate sodium, to a 50-mL color-comparison tube, and dilute with water to 5 mL.
Standard solution—
Transfer 2.0 mL of
Standard Lead Solution (20 µg of Pb) (see
Heavy Metals 
231
) to a 50-mL color-comparison tube, and dilute with water to 5 mL.
Procedure—
Add 1.0 mL of ferrous sulfate solution (1 in 1000) to the
Test solution and the
Standard solution, adjust the solutions with 1 N acetic acid to a pH between 3 and 4, add 10 mL of
hydrogen sulfide TS, mix, allow to stand for 5 minutes, and view downward over a white surface: the color of the solution from the
Test solution is not darker than that of the solution from the
Standard solution (0.002%).
Free iodine and iodide—
Test solution—
Transfer a volume of Injection, equivalent to 2 g of the total of ioxaglate meglumine and ioxaglate sodium, to a 50-mL centrifuge tube, add 25 mL of water and 15 mL of 2 N sulfuric acid, and mix thoroughly. Centrifuge for 15 minutes, and decant the supernatant layer into a glass-stoppered 50-mL graduated cylinder. Repeat the sulfuric acid washing and centrifugation once more, adding the supernatant layer into the 50-mL graduated cylinder.
Procedure—
Proceed as directed for
Procedure in the test for
Free iodine and iodide under
Ioxaglic Acid (0.02% of iodide).
Other requirements—
It meets the requirements under
Injections 1.
Assay for ioxaglate meglumine—
Determine the angular rotation (see
Optical Rotation 781) of the Injection, using a 10-cm cell and a suitable polarimeter. Calculate the percentage of ioxaglate meglumine in the Injection taken by the formula:
100a / 3.32,
in which
a is the observed angular rotation, in degrees, corrected for a water blank; and 3.32 is the specific rotation, in degrees, of ioxaglate meglumine.
Assay for iodine—
Transfer an accurately measured volume of Injection, equivalent to about 5 g (total) of ioxaglate meglumine and ioxaglate sodium, to a 250-mL volumetric flask, dilute with water to volume, and mix. Pipet 25 mL of this solution into a 125-mL conical flask, add 12 mL of 5 N sodium hydroxide and 1 g of powdered zinc, connect the flask to a reflux condenser, and reflux for 30 minutes. Proceed as directed in the
Assay for iodine under
Ioxaglic Acid. Each mL of 0.05 N silver nitrate is equivalent to 6.345 mg of iodine (I).
