Novel Organic Salts Based on Mefloquine: Synthesis, Solubility, Permeability, and In Vitro Activity against Mycobacterium tuberculosis

Dário Silva, Márcio V. C. Lopes, Željko Petrovski, Miguel M. Santos, Jussevania P. Santos, Sueli F. Yamada-Ogatta, Marcelle L. F. Bispo, Marcus V. N. de Souza, Ana Rita C. Duarte, Maria C. S. Lourenço, Raoni Schroeder B. Gonçalves, Luís C. Branco

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
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Abstract

The development of novel pharmaceutical tools to efficiently tackle tuberculosis is the order of the day due to the rapid development of resistant strains of Mycobacterium tuberculosis. Herein, we report novel potential formulations of a repurposed drug, the antimalarial mefloquine (MFL), which was combined with organic anions as chemical adjuvants. Eight mefloquine organic salts were obtained by ion metathesis reaction between mefloquine hydrochloride ([MFLH][Cl]) and several organic acid sodium salts in high yields. One of the salts, mefloquine mesylate ([MFLH][MsO]), presented increased water solubility in comparison with [MFLH][Cl]. Moreover, all salts with the exception of mefloquine docusate ([MFLH][AOT]) showed improved permeability and diffusion through synthetic membranes. Finally, in vitro activity studies against Mycobacterium tuberculosis revealed that these ionic formulations exhibited up to 1.5-times lower MIC values when compared with [MFLH][Cl], particularly mefloquine camphorsulfonates ([MFLH][(1R)-CSA], [MFLH][(1S)-CSA]) and mefloquine HEPES ([MFLH][HEPES]).

Original languageEnglish
Article number5167
Number of pages15
JournalMolecules
Volume27
Issue number16
DOIs
Publication statusPublished - 13 Aug 2022

Keywords

  • API-OSILs
  • ionic liquids
  • mefloquine
  • polymorphism
  • tuberculosis

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