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Table 3 Diameters of the zones of inhibition for the 80% aqueous methanolic extracts of WSREt, WSFEt and WSLEt on several species of Gram-negative bacteria

From: Methanolic extracts of Withania somnifera leaves, fruits and roots possess antioxidant properties and antibacterial activities

Test organisms

Diameters of zones of inhibition (mm)

 

WSREt

WSFEt

WSLEt

Tetracycline (100 μg/ml)

Escherichia coli

15.00 ± 0.96c

12.00 ± 1.50d

28.00 ± 0.56b

43.00 ± 1.90a

Salmonella typhi

13.00 ± 0.43c

14.00 ± 0.79c

32.00 ± 0.75b

47.00 ± 1.42 a

Citrobacter freundii

11.00 ± 0.86c

9.00 ± 1.21c

23.00 ± 1.27b

38.00 ± 1.22 a

Pseudomonas aeruginosa

9.00 ± 1.32c

10.00 ± 1.43c

26.00 ± 1.08b

40.00 ± 0.59 a

Klebsiella pneumoniae

10.00 ± 1.10c

8.00 ± 1.61c

19.00 ± 1.48b

36.00 ± 1.13 a

  1. Each value represents the mean ± SD of three different observations. Different letters in each row indicate a significant difference (p<0.05).