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Table 3 Antimicrobial activity of test samples of L. speciosa

From: Investigation of biological activities of the flowers of Lagerstroemia speciosa, the Jarul flower of Bangladesh

Test microorganisms Diameter of zone of inhibition (mm)
ME HXSF CTCSF CSF AQSF Ciprofloxacin/ Fluconazole (30 μg/disc)
Gram positive bacteria
Bacillus cereus 8.0 ± 0.12 7.00 ± 0.92 45 ± 2.01
Bacillus megaterium 16.0 ± 0.43 15.0 ± 0.73 42 ± 1.17
Bacillus subtilis 9.0 ± 0.56 9.0 ± 0.33 42 ± 0.73
Staphylococcus aureus 10.0 ± 0.57 19.0 ± 0.48 7.0 ± 1.45 7.0 ± 1.3 42 ± 0.23
Micrococcus luteus 9.0 ± 0.16 6.0 ± 0.45 7.0 ± 1.11 7.0 ± 0.92 42 ± 0.56
Gram negative bacteria
Escherichia coli 8.0 ± 0.54 7.0 ± 0.81 7.0 ± 0.45 42 ± 0.43
Pseudomonas aeruginosa 10.0 ± 0.36 7.0 ± 0.32 8.0 ± 0.31 42 ± 1.11
Salmonella paratyphi 8.0 ± 0.68 10.0 ± 0.55 8.0 ± 1.56 47 ± 2.33
Salmonella typhi 9.0 ± 0.17 9.0 ± 0.41 45 ± 0.73
Shigella boydii 7.0 ± 0.87 6.0 ± 0.66 7.0 ± 1.90 34 ± 0.58
Shigella dysenteriae 10.0 ± 0.73 9.0 ± 0.25 12.0 ± 0.22 7.0 ± 0.83 42 ± 0.22
Vibrio mimicus 6.0 ± 0.21 6.0 ± 0.16 8.0 ± 0.48 40 ± 0.45
Vibrio parahemolyticus 9.0 ± 1.56 6.0 ± 1.12 8.0 ± 2.12 7.0 ± 0.21 35 ± 0.44
Fungi
Saccharomyces cerevisiae 7.0 ± 1.12 7.0 ± 0.53 7.0 ± 1.43 6.0 ± 0.21 38 ± 0.11
Aspergillus niger 8.0 ± 0.43 8.0 ± 0.48 7.0 ± 0.33 5.0 ± 0.54 37 ± 0.33
  1. ME = Methanolic crude extract; HXSF = Hexane soluble fraction; CTCSF = Carbon tetrachloride soluble fraction; CSF = Chloroform soluble fraction; AQSF = Aqueous soluble fraction