Technetium Tc 99m Albumin Colloid Injection
» Technetium Tc 99m Albumin Colloid Injection is a sterile, pyrogen-free, aqueous suspension of Albumin Human that has been denatured to produce colloids of controlled particle size and that are labeled with 99mTc. It contains not less than 90.0 percent and not more than 110.0 percent of the labeled amount of 99mTc as albumin colloid complex, expressed in megabecquerels (millicuries) per mL at the time indicated on the labeling. Other chemical forms of radioactivity do not exceed 10.0 percent of the total radioactivity. It may contain suitable reducing agents, buffers, stabilizers, and nonaggregated albumin human. The vials are sealed under a suitable inert atmosphere. Its production and distribution are subject to federal regulations (see Biologics 1041 and Radioactivity 821).
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 expressed as total megabecquerels (millicuries) and concentration as megabecquerels (millicuries) per mL at the time of calibration; the expiration date and time and a 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 6.0 hours. In addition, the labeling states that it is not to be used if clumping of the albumin is observed, and directs that the container be agitated before the contents are withdrawn into a syringe.
USP Reference standards 11
USP Endotoxin RS
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.
pH 791: between 7.5 and 8.5.
Radiochemical purity—
A: Unbound pertechnetate—Apply a measured volume of Injection, appropriately diluted, such that it provides a count rate of about 20,000 counts per minute, about 10 mm from one end of a thin-layer chromatographic strip impregnated with silica gel (see Chromatography 621). Immediately develop the chromatogram over a suitable period by ascending chromatography, using methyl ethyl ketone as the solvent. Allow the chromatogram to dry. Determine the radioactivity distribution of the chromatogram by scanning with a suitable radiation detector. Not more than 10.0% of the total radioactivity is found at the solvent front as unbound pertechnetate.
B: Soluble 99mTc species
Acetate buffer— Transfer 20.0 mL of 0.2 M acetic acid and 30.0 mL of 0.2 M sodium acetate to a 100-mL volumetric flask, dilute with water to volume, and mix.
Procedure— Transfer 1 mL of the Injection containing about 925 to 1110 MBq (25 to 30 mCi) to a 12-mL centrifuge tube, and add 4 mL of Acetate buffer. Determine the radioactivity with a suitable counting assembly. Centrifuge at a force of 34,600 g (gravity) for 15 minutes. Separate the supernatant, and determine its radioactivity. Correct both measurements for decay to the same reference time. Calculate the percentage of soluble 99mTc species taken by the formula:
100(S/I)
in which S is the radioactivity of the supernatant, and I is the radioactivity of the specimen before centrifuging. Not more than 10.0% of the total radioactivity is found in the supernatant.
Particle size distribution—
Albumin reagent— Transfer 3.3 g of Poloxamer 188, 56.6 g of dibasic sodium phosphate, and about 800 mL of Water for Injection to a 1-liter volumetric flask, and mix. Add 120 mL of 25% Albumin Human, dilute with Water for Injection to volume, and mix. The pH of the resulting solution is 8.2 ± 0.7. Store at 2 to 8. Just prior to use, transfer 6.2 mL of this solution, measured at room temperature, to a 100-mL volumetric flask. Dilute with Sodium Chloride Injection to volume, and mix.
Procedure— Inject 0.5 mL of Injection into a 25-mL evacuated or nitrogen-filled vial. Inject 4.5 mL of Albumin reagent, and shake. Using a syringe, remove 0.2 mL of the resulting mixture, and attach the syringe by means of a locking-type connection to the top of a 25-mm filter housing assembly consisting of a 5.0-µm polycarbonate membrane filter on top followed by a distance of 3 cm by a 0.1-µm polycarbonate membrane filter. Pass the mixture through the filters, collecting the filtrate in a suitable container. Wash the filters by passing 12 mL of Albumin reagent through the filter housing assembly, adding the washing to the first filtrate. Using a suitable ionization chamber, measure the radioactivity in the filtrate and on each filter. Calculate the percentage of radioactivity retained on the 5.0-µm filter taken by the formula:
100F/T
in which F is the radioactivity on the filter, and T is the total radioactivity of each filter and filtrate: not more than 7.5% of the total radioactivity is retained on the 5.0-µm filter. Calculate the percentage of radioactivity retained on the 0.1-µm filter by the same formula: not less than 82.5% of the total radioactivity is retained, and not more than 10.0% of the total radioactivity passes through the 0.1-µm membrane.
Biological distribution— Inject intravenously between 55.5 and 111 MBq (1.5 and 3.0 mCi) of Injection, in a volume of 0.1 mL, into the caudal vein of each of three 20-g to 40-g mice. Fifteen minutes after injection, sacrifice the animals, and remove the tails, and discard. Carefully remove the liver and lungs of each. Place each organ and the remaining carcass in separate, suitable counting containers, and determine the radioactivity, in MBq (mCi), in each container in a calibrated ionization chamber, using the same counting geometry. Determine the percentage of radioactivity in the liver and the lungs taken by the formula:
100(A/B)
in which A is the radioactivity, in MBq (mCi), in the organ, and B is the total radioactivity, in MBq (mCi), 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 not less than two of the three mice.
Albumin content— Each container, prior to constitution with Sodium Pertechnetate Tc 99m Injection, contains not less than 0.8 mg and not more than 1.2 mg of aggregated (insoluble) albumin and not less than 8 mg and not more than 12 mg of nonaggregated (soluble) albumin.
Procedure—
Acetate buffer— Transfer 20.0 mL of 0.2 M acetic acid and 30.0 mL of 0.2 M sodium acetate to a 100-mL volumetric flask, dilute with water to volume, and mix. Adjust by the addition, if necessary, of 0.2 M acetic acid or 0.2 M sodium acetate to a pH of 4.9 ± 0.1.
Basic acetate buffer— Transfer 50 mL of 1 N sodium hydroxide to a 500-mL volumetric flask. Dilute with Acetate buffer to volume, and mix.
Standard preparation— Using a “To contain” pipet, transfer 2.0 mL of 7 Percent Bovine Serum Albumin Certified Standard (see under Reagents in the section Reagents, Indicators, and Solutions), to a 250-mL volumetric flask. Rinse the pipet with Basic acetate buffer collecting the rinse in the volumetric flask. Dilute with Basic acetate buffer to volume, and mix.
Standard solutions— Into 5 separate graduated test tubes pipet 1, 2, 3, 4, and 5 mL of the Standard preparation. Dilute the first four with Basic acetate buffer to a final volume of 5.0 mL. Pipet 5 mL of Biuret Reagent TS into each tube, and mix. Incubate each at 37 ± 1 for 30 minutes. Allow to cool to room temperature. Determine the absorbances of the solutions in 1-cm cells at the wavelength of maximum absorbance at about 555 nm using a mixture of Basic acetate buffer and Biuret Reagent TS (1:1) as the blank. Plot the concentration, in mg per mL, versus the absorbance of each Standard solution and draw the best straight line through the points to obtain the standard curve.
Test preparation— Constitute the contents of each of 2 containers with 2.0 mL of Acetate buffer and allow to stand for 30 minutes. Transfer the contents of both containers to a centrifuge tube rinsing the containers with four 1-mL portions of Acetate buffer. Collect all the washings in the same centrifuge tube. Centrifuge the tube for 15 minutes at 4 at a force of 86,400 g (gravity). Quantitatively transfer the supernatant to a 50-mL volumetric flask. Add 5.0 mL of 1 N sodium hydroxide, dilute with Acetate buffer to volume, and mix. Pipet 5 mL of this solution into a test tube to obtain the Soluble albumin test solution. Dissolve the residue from the centrifugation in 5.0 mL of Basic acetate buffer to obtain the Insoluble albumin test solution. Treat each solution in the same manner as described under Standard solutions, beginning with “Pipet 5 mL of Biuret Reagent TS” and determine the absorbance of each solution as directed for Standard solutions. From the observed absorbance of each Test preparation, determine the concentration of total albumin from the standard curve. Multiply the concentration obtained for the Soluble albumin test solution by 25 to obtain the mg of soluble albumin per container. Multiply the concentration obtained for the Insoluble albumin test solution by 2.5 to obtain the mg of insoluble albumin per container.
Other requirements— It meets the requirements of the tests for Radionuclide identification and Radionuclidic purity under Sodium Pertechnetate Tc 99m Injection. It meets also the requirements under Injections 1, except that it may be distributed or dispensed prior to completion of the test for Sterility, the latter test being started on the date of manufacture, and except that it is not subject to the recommendation on Volume in Container.
Assay for radioactivity 821 Using a suitable counting assembly (see Selection of a Counting Assembly), determine the radioactivity, in MBq (mCi) per mL, of Technetium Tc 99m Albumin Colloid by the use of a calibrated system.
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