Technetium Tc 99m Exametazime Injection, chemical structure, molecular formula, Reference Standards
Technetium Tc 99m Exametazime Injection
d,1-Hexamethylpropylene amine oxime-99mTc
»Technetium Tc 99m Exametazime Injection is a sterile,aqueous solution,suitable for intravenous administration,composed of the primary lipophilic complex of exametazime that is labeled with radioactive 99mTc.It contains not less than 90.0percent and not more than 110.0percent of the labeled amount of 99mTc as primary lipophilic exametazime complex expressed in megabecquerels (or in microcuries or millicuries)per mLat the date and time indicated in the labeling.It may contain antioxidants,reducing agents,and buffers.Astabilizing solution containing methylene blue and phosphate buffer may be added to the final radio labeled product to extend the expiration time.Other chemical forms of radioactivity (99mTc pertechnetate,99mTc hydrolyzed reduced species,and 99mTc secondary exametazime complex)do not exceed 20.0percent of the total radioactivity.
Packaging and storage
Preserve in single-dose or multiple-dose containers,at controlled room temperature.
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 labeled exametazime expressed as total megabecquerels (or as total microcuries or millicuries)and concentration as megabecquerels (or as microcuries or millicuries)per mLat the time of calibration;the expiration date and time;and a statement,CautionRadioactive 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.[NOTEThe label states that,upon constitution with Sodium Pertechnetate Tc 99m Injection,the beyond-use time is 30minutes for the unstabilized Injection and between 4hours and 6hours for the stabilized Injection.]
USP Reference standards á11ñ
USP Endotoxin RS.
between 9.0and 9.8for unstabilized Injection,and between 6.5and 7.5for stabilized Injection.
Prepare three 12-×75-mm chromatographic tubes by packing with about 0.3mLof fresh methyl ethyl ketone,0.9%nonbacteriostatic sodium chloride solution,and a 50%acetonitrile solution,prepared with nonbacteriostatic water,respectively.To each of two 6-×0.7-cm instant thin-layer chromatographic strips1and one 6-×0.7-cm strip of chromatographic paper2,apply 5µLof freshly prepared (within 2minutes of reconstitution)Injection about 1cm from the bottom of the strip.Do not allow to dry.Place one instant thin-layer chromatographic strip into the tube containing methyl ethyl ketone,the second instant thin-layer chromatographic strip into the tube containing the 0.9%sodium chloride solution,and the paper strip into the tube containing the 50%acetonitrile solution.The strips must not adhere to the sides of the tubes.Allow the chromatograms to develop until the solvent front has moved to the top of the strips.Remove the strips from the tubes,and allow the solvents to evaporate.Determine the radioactive distribution by scanning the strip sections,using a suitable collimated radiation detector.The difference between the radioactivity detected at the origin of the 0.9%sodium chloride strip and at the origin of the methyl ethyl ketone strip represents the primary lipophilic 99mTc exametazime complex.The radioactivity at the solvent front of the 0.9%sodium chloride strip represents the 99mTc pertechnetate radiochemical impurity.The radioactivity at the origin of the 50%acetonitrile strip represents the 99mTc hydrolyzed,reduced radiochemical impurity.The difference between the radioactivity detected at the origin of the methyl ethyl ketone strip and the origin of the 50%acetonitrile strip represents the secondary 99mTc exametazime complex radiochemical impurity.Not less than 80%of the total radioactivity is found as primary lipophilic 99mTc exametazime complex.[NOTEComplete the measurement within 30minutes after constitution of the unstabilized Injection and between 4hours and 6hours after constitution of the stabilized Injection.]
Inject between 18.5MBq and 37MBq (between 0.5mCi and 1mCi)of Injection in a volume not exceeding 0.1mLinto the caudal vein of each of three 130-to 190-g Sprague-Dawley rats.Five to ten minutes after the injection,sacrifice the animals and carefully remove the brain,liver,and intestines (including gall bladder).Place each organ and the remaining carcass in separate,suitable counting containers,and determine the radioactivity,in counts per minute,in each container with an appropriate detector,using the same counting geometry.Determine the percentage of radioactivity in the brain,liver,intestines,and remaining carcass 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 brain,liver,intestines,and carcass.Not less than 1.5%of the radioactivity is found in the brain.Not more than 20%of the radioactivity is found in the intestines,and not more than 15%of the radioactivity is found in the liver,in not less than two of the animals.
It meets the requirements of the tests for Radionuclidic identificationand Radionuclide purityand Bacterial endotoxinsunder Sodium Pertechnetate Tc 99m Injection.It meets also the requirements under Injections á1ñ,except that it may be distributed or dispensed prior to completion of the test for Sterility,the latter test being started on the day of 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 (or µCi)per mL,of Injection by use of a calibrated system.
ITLC/SG,6-×0.7-cm strip available from Biodex Medical Systems,Shirley,NY.
Whatman Grade 31ET Chr,available from Whatman LabSales,Hillsboro,OR.
Staff Liaison:Andrzej Wilk,Ph.D.,Senior Scientific Associate
Expert Committee:(RMI)Radiopharmaceuticals and Medical Imaging Agents
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