Sulfur,colloidal,metastable technetium-99labeled [7704-34-9].

Packaging and storage— Store in single-dose or multiple-dose containers.

Labeling— Label it to include the following,in addition to the information specified for Labelingunder Injections á1ñ:the time and date of calibration;the amount of 99mTc as sulfur colloid expressed as total megabecquerels (microcuries or millicuries)and concentration as megabecquerels (microcuries or millicuries)per mLat the time of calibration;the expiration date;and the statement “Caution—Radioactive Material.”The labeling indicates that in making dosage calculations,correction is to be made for radioactive decay,and also indicates that the radioactive half-life of 99mTc is 6.0hours;in addition,the labeling states that it is not to be used if flocculent material is visible and directs that the container be agitated before the Injection is withdrawn into a syringe.

USP Reference standards á11ñ— USP Endotoxin RS.

Radionuclide identification(see Radioactivity á821ñ)— It meets the requirements of the test for Radionuclide identificationunder Sodium Pertechnetate Tc 99m Injection.

Bacterial endotoxins á85ñ— The limit of endotoxin content is not more than 175/VUSP Endotoxin Unit per mLof the Injection,when compared with the USP Endotoxin RS,in which Vis the maximum recommended total dose,in mL,at the expiration date or time.

pHá791ñ: between 4.5and 7.5.

Radionuclidic purity— It meets the requirements of the test for Radionuclidic purityunder Sodium Pertechnetate Tc 99m Injection.

Radiochemical purity— Place a measured volume of Injection,appropriately diluted,such that it provides a count rate of about 20,000counts per minute,about 25mm from one end of a 25-×300-mm strip of chromatographic paper (see Chromatography á621ñ),and allow to dry.Develop the chromatogram over a suitable period by ascending chromatography,using dilute methanol (8.5in 10),and air-dry.Determine the radioactivity distribution by scanning the chromatogram with a suitable collimated radiation detector.Not less than 92%of the total radioactivity is found as sulfur colloid (at the point of application).

Biological distribution— Inject intravenously between 0.075MBq and 0.75MBq (2µCi and 20µCi)of the Injection in a volume not exceeding 0.2mLinto the caudal vein of each of three 20-g to 25-g mice.Ten to 30minutes after the injection,sacrifice the animals,and carefully remove the liver and lungs of each by dissection.Place each organ and remaining carcass in separate,suitable counting containers,and determine the radioactivity,in counts per minute,in each container in an appropriate scintillation well counter,using the same counting geometry.Determine the percentage of radioactivity in the liver and the lungs taken by the formula: in which Ais the net radioactivity,in counts per minute,in the organ,and Bis the total radioactivity,in counts per minute,in the lungs,liver,and carcass.Not less than 80%of the radioactivity is found in the liver and not more than 5%of the radioactivity is found in the lungs,in two of the mice.

Other requirements— It meets the requirements under Injections á1ñ,except that the Injection may be distributed or dispensed prior to completion of the test for Sterility,the latter test being started on the day of final manufacture,and except that it is not subject to the recommendation on Volume in Container.

Assay for radioactivity á821ñ— Using a suitable counting assembly (see Selection of a Counting Assembly),determine the radioactivity,in MBq (µCi)per mL,of Injection by use of a calibrated system.

Expert Committee:(RMI)Radiopharmaceuticals and Medical Imaging Agents

USP28–NF23Page 1865

Phone Number:1-301-816-8305