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Table 2 Minimum inhibitory concentration (MIC) and total antibacterial activity (TAA) and selectivity index (SI) of the nine selected acetone leaf extracts against Proteus mirabilis, Enterobacter cloacae and Escherichia coli

From: Potency and selectivity indices of acetone leaf extracts of nine selected South African trees against six opportunistic Enterobacteriaceae isolates from commercial chicken eggs

  Proteus mirabilis Enterobacter cloacae Escherichia coli
Plants MIC (mg/ml) TAA (ml/g) SI MIC (mg/ml) TAA (ml/g) SI MIC (mg/ml) TAA (ml/g) SI
H. roeperianum 0.63 190.4 0.11 0.31 387.0 0.21 0.08 1499.6 0.83
C. triflora 0.63 32.0 0.09 0.08 252.1 0.72 0.08 252.1 0.72
H. arborescens 0.31 84.0 0.26 0.16 162.7 0.51 0.08 325.4 1.01
P. viridiflorum 0.31 87.6 0.18 0.16 169.8 0.34 0.08 339.6 0.68
B. speciosus 0.63 36.6 0.08 0.08 287.9 0.66 0.08 287.9 0.66
C. aurea 0.31 92.7 0.04 0.08 357.9 0.17 0.04 715.8 0.34
M. lanceolata 0.02 5561.7 0.12 0.08 1390.4 0.03 0.16 695.2 0.01
E. croceum 0.08 1124.6 0.07 0.08 1124.6 0.07 0.08 1124.6 0.07
M. mesozygia 1.25 14.8 0.03 0.16 115.4 0.25 0.08 230.8 0.51
Mean 0.46 NA NA 0.13 NA NA 0.08 NA NA
SD 0.35 NA NA 0.07 NA NA 0.03 NA NA
Gentamicin 0.0008 NA NA 0.0002 NA NA 0.006 NA NA
  1. NA Not applicable.
  2. The SI and TAA values of the extracts was calculated from the cytotoxicity and percentage yield of the extracts results published in Elisha et al. [12]
  3. Numbers in bold font MIC < 0.1 mg/ml