Antibacterial Activities of Calpurnia aurea against Selected Animal Pathogenic Bacterial Strains
Table 5
Antibacterial activity of crude extracts of the bark and antibiotics against the test pathogens (mean ± SD, n = 3).
Tested pathogens
Zone of inhibition
Crude extract solvents from the bark
Antibiotics
Conc. Ml (mg)
Water (mean ± SD) (mm)
Ethanol (mean ± SD) (mm)
Conc. Ml/Mg
Ciprofloxacin (mean ± SD) (mm)
Amoxicillin (mean ± SD) (mm)
Penicillin (mean ± SD) (mm)
Tetracycline (mean ± SD) (mm)
S. aureus
25
1.67 ± 0.52Aa
10.6 ± 0.93Bb
0.1
11.83 ± 0.40Fb
13.37 ± 0.31Fb
—
21.13 ± 1.07Cf
50
2.3 ± 0.18Ba
10.83 ± 2.07Bb
0.2
11.93 ± 1.03Fb
20.1 ± 1.59Dd
—
28.63 ± 3.06Ef
S. pyogenes
25
0.97 ± 0.18Ag
10.2 ± 0.76Bb
0.1
29.13 ± 1.97Bc
15.7 ± 0.76Ed
12.6 ± 0.58Aa
11.47 ± 0.66Ab
50
3.1 ± 0.24Ca
13.5 ± 0.99Eb
0.2
30.47 ± 0.88Ac
29.97 ± 1.71Ad
30.13 ± 0.83Fe
25.47 ± 4.35Df
L. monocytogenes
25
1.77 ± 0.22Aa
8.07 ± 0.49Aa
0.1
19.6 ± 0.56Dc
17.83 ± 0.87Fd
16.7 ± 0.80Bc
31.33 ± 1.61Ff
50
2.57 ± 0.21Ba
9.97 ± 1.04Ab
0.2
25.8 ± 1.44Cc
23.23 ± 4.33Cd
28.2 ± 2.08Ee
31.63 ± 0.66Ff
E. coli O157 H:7
25
1.03 ± 0.18Aa
10.33 ± 0.94Bb
0.1
17.3 ± 3.62Ec
13.03 ± 2.61Fd
—
25.53 ± 3.16Df
50
5.23 ± 0.77Ea
13.23 ± 3.24Eb
0.2
19.73 ± 0.94Dc
16.8 ± 0.78Ed
—
27.87 ± 0.53Ef
S. typhi
25
2.13 ± 0.60Ba
11.13 ± 1.97Cb
0.1
16.27 ± 1.19Ec
26.57 ± 2.36Bd
15.2 ± 0.70Bc
23.77 ± 1.35Cf
50
4.2 ± 1.71Da
12.77 ± 3.63Db
0.2
22.27 ± 1.14Cc
26.87 ± 1.62Bd
23.87 ± 3.72Cc
28.13 ± 3.62Ef
C. jejuni
25
1.1 ± 0.27Aa
12.5 ± 0.50Db
0.1
29.03 ± 1.26Bc
19.97 ± 0.77Dd
23.1 ± 2.0Cc
15.67 ± 0.90Bb
50
2.63 ± 0.85Ba
12.47 ± 1.43Db
0.2
31.37 ± 0.86Ac
23.6 ± 3.49Cd
25.6 ± 2.25De
18.2 ± 1.49Bf
n = number of experimental replicates; SD = standard deviation; means with the same letter (lower case) in the same row are not significantly different; means with the same letter (upper case) in the same column are not significantly different.