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Accumulation of five fluoroquinolones by Mycobacterium tuberculosis H37Rv.

The accumulation of ciprofloxacin, norfloxacin, moxifloxacin, levofloxacin and ofloxacin by Mycobacterium tuberculosis H37Rv was determined with a modified fluorescence method. The time to achieve a steady-state concentration (SSC) of each agent in M. tuberculosis was 60-240 s. Moxifloxacin was accumulated to the lowest concentration and ciprofloxacin to the highest. However, ciprofloxacin took longer to achieve an SSC than the other four agents; levofloxacin reached steady state in the shortest time. Larger fluoroquinolones accumulated to the lowest concentration and more slowly. Although all five agents had low hydrophobicity values (P(app) < or =0.11), those with the lowest values accumulated to the higher concentrations.[1]

References

  1. Accumulation of five fluoroquinolones by Mycobacterium tuberculosis H37Rv. Piddock, L.J., Ricci, V. J. Antimicrob. Chemother. (2001) [Pubmed]
 
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