Packaging and storage
Preserve in single-dose or in multiple-dose containers, at a temperature between 2
and 8
.
Labeling
Label it to include the following, in addition to the information specified for
Labeling under
Injections 1: the time and date of calibration; the amount of
99mTc as labeled pentetic acid complex expressed as total megabecquerels (millicuries or microcuries) and concentration as megabecquerels (microcuries or millicuries) per mL at the time of calibration; the expiration date; and the 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 6.0 hours.
Bacterial endotoxins 85
The limit of endotoxin content is not more than 175/
V USP Endotoxin Unit per mL of the Injection, when compared with the USP Endotoxin RS, in which
V is the maximum recommended total dose, in mL, at the expiration date or time.
Radiochemical purity
Phosphate buffer
Dissolve 2.6 g of monobasic sodium phosphate and 3.0 g of anhydrous dibasic sodium phosphate in water to make 1000 mL. Adjust, if necessary, by the addition of 0.2 M phosphoric acid or 0.2 M sodium hydroxide, to a pH of 6.8 ± 0.05.
Procedure
(see
Electrophoresis 726)Soak a 2.5- × 17.0-cm cellulose polyacetate strip in 100 mL of
Phosphate buffer for 10 to 60 minutes. Remove the strip with forceps, taking care to handle the outer edges only. Place the strip between two absorbent pads, and blot to remove excess solution. Attach the strip to the support bridge of an electrophoresis chamber containing
Phosphate buffer in each side of the chamber. Ensure that each end of the strip is in contact with
Phosphate buffer. Mark the application line near the cathode end of the strip. Apply as a spot 1 µL of a 1 in 1000 solution of amaranth in
Phosphate buffer. Adjacent to this, apply as a narrow streak 5 µL of Injection having an activity of about 1 mCi per mL, previously diluted with
saline TS, if necessary. Attach the chamber cover, and perform the electrophoresis at 300 volts until the amaranth (red dye) has moved about four-fifths of the length of the strip. Remove the strip from the chamber, and blot the ends on paper towels. Using a suitable scanner and counting assembly, determine the radioactivity distribution. Labeled technetium pentetate migrates a distance that is 0.9 relative to that of amaranth. Hydrolyzed technetium Tc 99m is located at the origin and pertechnetate migrates a distance that is 0.7 relative to that of amaranth: the sum of the percentages of radioactivity of hydrolyzed technetium Tc 99m and pertechnetate is not greater than 10.0% of the total radioactivity on the strip.
Biological distribution
Inject intravenously between 0.075 MBq and 0.75 MBq (2 µCi and 20 µCi) of Injection, in a volume not exceeding 0.2 mL, into the caudal vein of each of three 20- to 25-g mice. Approximately 10 to 15 minutes after injection, place each animal in a suitable container and count the radioactivity of each with an appropriate radiation detector, using the same counting geometry, in order to determine the total activity injected. Approximately 24 hours after injection, repeat the radioactivity counting of each animal, as above. After correcting for decay, determine the percentage of radioactivity retained in each animal 24 hours after injection by the formula:
100(A/B),
in which
A is the net radioactivity, in counts per minute (corrected for decay), in the animal at 24 hours, and
B is the total radioactivity, in net counts per minute, at the time of injection. The percentage of injected radioactivity retained 24 hours after administration is not greater than 5.0% of the injected activity in any of the animals.