Synthesis of 99mTc-Rifabutin: A Potential Tuberculosis Radiodiagnostic Agent

Author(s): Syed Q. Shah*, Mamoona Alam

Journal Name: Infectious Disorders - Drug Targets
Formerly Current Drug Targets - Infectious Disorders

Volume 17 , Issue 3 , 2017

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Graphical Abstract:


Background: Rifabutin (RFN) is bactericidal antibiotic with a very broad spectrum of activity against gram positive & gram negative organisms including Pseudomonas aeruginosa and specifically Mycobacterium tuberculosis. RFN inhibits DNA dependent RNA polymerase activity in susceptible cells. In the instant work, the therapeutic characteristics of RFN were intended for diagnostic rationale by labeling it with 99mTc (Technetium-99m).

Objective: The 99mTc labeled RFN (99mTc-RFN) was investigated for labeling capacity, steadiness in saline & serum, in vitro Mycobacterium tuberculosis (MBT) uptake & distribution in MBT stained animal model rats.

Method: It was found that 99mTc-RFN prepared by mixing 2 mg of RFN, 2.5 mCi sodium pertechnetate, 150 μg stannous chloride at pH 5.4 gave highest yield after 30 minutes and was intact above 90 % after 240 min at room temperature in saline.

Result: The 99mTc-RFN showed a stable profile in serum at 37 °C and impurities appeared up 16 h was 15.20 %. The maximum in vitro MBT uptake observed in live strain was 71.75 ± 0.75 %. The premier uptake observed in the MBT infected site (target site) was 14.15 ± 0.00 %, in animal model rat. Conclusion: Higher labeling capacity, steadiness in saline & serum, higher MBT uptake, maximum uptake in the MBT infected sites and precise imaging posed 99mTc- RFN as an alternate radio-drug for tuberculosis scintigraphy.

Keywords: Rifabutin, Mycobacterium tuberculosis, 99mTc-RFN, labeling capacity, in vitro MBT uptake, animal model rat, tuberculosis scintigraphy.

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Article Details

Year: 2017
Published on: 12 September, 2017
Page: [185 - 191]
Pages: 7
DOI: 10.2174/1871526517666170606114650
Price: $65

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