A modified broth microdilution method (CLSI, 2009) was used
to obtain the MICs of the tested materials. An aliquot (20 lL) of a
3–5 h culture of each bacterial strain (multidrug-resistant A. baumannii JVC 1053 and E. coli ATCC 25922), containing approximately
5 104 CFU/mL, was individually applied into Muller–Hinton
broth (MHB, Merck, Germany) supplemented with the plant
extracts. The extract (100 lg) and pure compounds (100 lg) were
diluted in DMSO, (1 mL, Merck, Germany) and twofold dilutions
were made to obtain concentrations ranging from 0.05 to
100 lg/mL. The microtiter plates were incubated at 37 C for
18 h. Minimum inhibitory concentrations were observed at least
in duplicate as the lowest concentration of the plant extracts that
produced a complete suppression of the bacterial growth.
A modified broth microdilution method (CLSI, 2009) was usedto obtain the MICs of the tested materials. An aliquot (20 lL) of a3–5 h culture of each bacterial strain (multidrug-resistant A. baumannii JVC 1053 and E. coli ATCC 25922), containing approximately5 104 CFU/mL, was individually applied into Muller–Hintonbroth (MHB, Merck, Germany) supplemented with the plantextracts. The extract (100 lg) and pure compounds (100 lg) werediluted in DMSO, (1 mL, Merck, Germany) and twofold dilutionswere made to obtain concentrations ranging from 0.05 to100 lg/mL. The microtiter plates were incubated at 37 C for18 h. Minimum inhibitory concentrations were observed at leastin duplicate as the lowest concentration of the plant extracts thatproduced a complete suppression of the bacterial growth.
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