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Abstract
Fractionation of the ethyl acetate extract of the bacterium Pseudomonas aeruginosa led to the isolation of five compounds, cyclo –(L-Phe-L-Pro) (1), 3-heptyl-3-hydroxy-1,2,3,4-tetrahydroquinoline-2.4-dione (2), 2-heptyl-4-hydroxyquinoline (3), 2-nonyl-4-hydroxyquinoline (4), and 1-phenazinecarboxylic acid (5). The structures of compounds 1-5 were established by spectroscopic analyses. Compounds 2 4 produced inhibition on the growth of Plasmodium falciparum, with IC50 values of 3.47, 2.57 and 2.79 μg/mL, respectively. Compounds 3-4 had activity against Trypanosoma cruzi, with IC50 values of 3.66 and 3.99 μg/mL. Finally, all compounds were found inactive when tested against Leishmania donovani at 10 μg/mL.
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