| Summary: | Objective: To evaluate the antibacterial activity of methanol extract of Hibiscus sabdariffa (H. sabdariffa) calyces employed in Sudanese folk medicine against five hospital
isolates of multidrug resistant Acinetobacter baumannii (MDR A. baumannii).
Methods: The antibacterial activity of 80% methanol extract (v/v) of H. sabdariffa
calyces was evaluated by agar disc diffusion, minimum inhibitory concentration and
minimum bactericidal concentration methods. Antibiotic susceptibility of selected
A. baumannii strains was tested.
Results: In the present investigation, the methanol extract from the calyces of
H. sabdariffa exhibited significant antibacterial properties against the non-MDR
A. baumannii as well as the MDR A. baumannii strains with a zone of inhibition
ranging from (11.3 ± 0.3) to (13.6 ± 0.3) mm. The relative percentage inhibition of
H. sabdariffa extract (10 mg/disc) with respect to gentamicin (10 mg/disc) had potent
antibacterial properties and was much more effective than gentamicin. Values of minimum inhibitory concentration and minimum bactericidal concentration ranged from 25 to
50 and 50 to 100 mg/mL, respectively, revealing the potential bactericidal properties of
the extract.
Conclusions: According to the present study, the calyces of H. sabdariffa can be used as
a substitute source of the current ineffective synthetic antibiotics used against MDR
A. baumannii.
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