Sodium Fluoride F 18 Injection
» Sodium Fluoride F 18 Injection is a sterile solution, suitable for intravenous administration, of sodium fluoride in Sodium Chloride Injection in which a portion of the molecules are labeled with radioactive 18F (see Radiopharmaceuticals for Positron Emission Tomography—Compounding 823). It contains not less than 90.0 percent and not more than 110.0 percent of the labeled amount of 18F expressed in megabecquerels (or in millicuries) per mL at the time indicated in the labeling.
Specific activity: no carrier added.
Packaging and storage— Preserve in single-dose or multiple-dose containers that are adequately shielded.
Labeling— Label container to include the following, in addition to the information specified for Labeling under Injections 1: the time and date of calibration; the amount of 18F as fluoride anion expressed as MBq (or mCi) per mL, at time of calibration; total activity at time of calibration; the expiration time and date; and the statements “Caution—Radioactive Material” and “Do not use if cloudy or if it contains particulate matter.” Label it to indicate that the radioactive half-life of 18F is 109.7 minutes, and that in making dosage calculations, correction is to be made for radioactive decay.
USP Reference standards 11
USP Endotoxin RS
USP Sodium Fluoride RS
Radionuclide identification (see Radioactivity 821)
A: Its half-life, determined using a suitable detector system, is between 105 and 115 minutes.
B: Radiochemical identity—The retention time of the major peak in the chromatogram of the Test solution corresponds to that in the chromatogram of the Standard solution, as obtained in the test for Radiochemical purity.
Bacterial endotoxins 85 It contains not more than 175/V USP Endotoxin Unit per mL of the Injection, in which V is the maximum administered total dose, in mL, at the expiration time. It also meets the requirements of Quality Control under Radiopharmaceuticals for Positron Emission Tomography—Compounding 823.
Sterility 71: meets the requirements.
pH 791: between 4.5 and 8.0.
Chemical purity— This article may be synthesized by different methods and processes and may, therefore, may contain different impurities. The presence of unlabeled ingredients, reagents, and by-products specific to the process must be controlled, and their potential for physiological or pharmacological effects must be considered.
Radiochemical purity—
Mobile phase— Prepare a filtered and degassed solution of 0.003 N sulfuric acid in water.
Standard solution— Dissolve an accurately weighed quantity of USP Sodium Fluoride RS in water, and dilute quantitatively, and stepwise if necessary, with water to obtain a solution having a known concentration of about 0.1 mg per mL.
Test solution— Use the Injection.
Chromatographic system (see Chromatography 621)—The liquid chromatograph is equipped with a flow-through gamma ray detector, a conductivity detector, and a 10-mm × 25-cm column that contains 10-µm packing L31. The flow rate is about 0.8 mL per minute. Chromatograph the Test solution, and record the peak responses as directed for Procedure: the relative standard deviation for replicate injections is not more than 5%.
Procedure— Prepare a solution of the Test solution and the Standard solution, inject about 50 µL of the combined solution into the chromatograph, record the chromatograms, and measure the areas for both the radioactive and nonradioactive peaks (the injection volume may be adjusted to obtain suitable detection system sensitivity): the radioactivity of the major peak is not less than 95% of the total radioactivity measured; and the retention time of the Test solution corresponds to the retention time (about 8 minutes) of the Standard solution.
Radionuclide purity— Using a suitable gamma-ray spectrometer (see Selection of a Counting Assembly under Radioactivity 821), count an appropriate aliquot of Injection for a period of time sufficient to obtain a gamma spectrum. The resultant gamma spectrum should be analyzed for the presence of identifiable photopeaks which are not characteristic of 18F emission: not less than 99.5% of the gamma emissions correspond to the 0.511 MeV, 1.022 MeV, or Compton scatter peaks of 18F.
Other requirements— It meets the requirements under Injections 1, except that the Injection may be distributed or dispensed prior to completion of the test for Sterility 71, the latter test started within 24 hours of final manufacture, and except that it is not subject to the recommendation on Volume in Container.
Assay for radioactivity— Using a suitable calibrated system as directed under Radioactivity 821, determine the radioactivity, in MBq (or MCi) per mL, of Injection.
Auxiliary Information— Please check for your question in the FAQs before contacting USP.
Topic/Question Contact Expert Committee
Monograph Ravi Ravichandran, Ph.D.
Principal Scientific Liaison
(SM42010) Monographs - Small Molecules 4
Reference Standards RS Technical Services
85 Radhakrishna S Tirumalai, Ph.D.
Principal Scientific Liaison
(GCM2010) General Chapters - Microbiology
71 Radhakrishna S Tirumalai, Ph.D.
Principal Scientific Liaison
(GCM2010) General Chapters - Microbiology
USP35–NF30 Page 3236
Pharmacopeial Forum: Volume No. 27(2) Page 2148