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Antimycobacterial susceptibility evaluation of rifampicin and isoniazid benz-hydrazone in biodegradable polymeric nanoparticles against Mycobacterium tuberculosis H37Rv strain

Authors Hakkimane SS, Shenoy VP, Gaonkar SL, Bairy I, Guru BR

Received 27 January 2018

Accepted for publication 10 April 2018

Published 23 July 2018 Volume 2018:13 Pages 4303—4318


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

Editor who approved publication: Dr Thomas Webster

Sushruta S Hakkimane,1 Vishnu Prasad Shenoy,2 Santosh L Gaonkar,3 Indira Bairy,4 Bharath Raja Guru1,5

1Department of Biotechnology, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, India; 2Department of Microbiology, Kasturba Medical College, Manipal Academy of Higher Education, Manipal, India; 3Department of Chemistry, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, India; 4Department of Microbiology, Melaka Manipal Medical College, Manipal Academy of Higher Education, Manipal, India; 5Manipal McGill Center for Infectious Diseases, Manipal Academy of Higher Education, Manipal, India

Introduction: Tuberculosis (TB) is the single largest infectious disease which requires a prolonged treatment regime with multiple drugs. The present treatment for TB includes frequent administration of a combination of four drugs for a duration of 6 months. This leads to patient’s noncompliance, in addition to developing drug-resistant strains which makes treatment more difficult. The formulation of drugs with biodegradable polymeric nanoparticles (NPs) promises to overcome this problem.
Materials and methods: In this study, we focus on two important drugs used for TB treatment – rifampicin (RIF) and isoniazid (INH) – and report a detailed study of RIF-loaded poly lactic-co-glycolic acid (PLGA) NPs and INH modified as INH benz-hydrazone (IH2) which gives the same therapeutic effect as INH but is more stable and enhances the drug loading in PLGA NPs by 15-fold compared to INH. The optimized formulation was characterized using particle size analyzer, scanning electron microscopy and transmission electron microscopy. The drug release from NPs and stability of drug were tested in different pH conditions.
Results: It was found that RIF and IH2 loaded in NPs release in a slow and sustained manner over a period of 1 month and they are more stable in NPs formulation compared to the free form. RIF- and IH2-loaded NPs were tested for antimicrobial susceptibility against Mycobacterium tuberculosis H37Rv strain. RIF loaded in PLGA NPs consistently inhibited the growth at 70% of the minimum inhibitory concentration (MIC) of pure RIF (MIC level 1 μg/mL), and pure IH2 and IH2-loaded NPs showed inhibition at MIC equivalent to the MIC of INH (0.1 μg/mL).
Conclusion: These results show that NP formulations will improve the efficacy of drug delivery for TB treatment.

Keywords: rifampicin nanoparticles, isoniazid hydrazone, drug susceptibility, Mycobacterium tuberculosis

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