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Table 2 Diameter of the inhibition of respiratory bacterial growth by essential oils and by antibiotics* )

From: Chemical composition of 8 eucalyptus species' essential oils and the evaluation of their antibacterial, antifungal and antiviral activities

Essential oils

Tested microorganisms (number of strains)

H. influenzae(11)

K. pneumoniae(13)

P. aeruginosa(10)

S. aureus(17)

S. agalactiae(9)

S. pneumoniae(19)

S. pyogenes(4)

E. maidenii

14.5 ± 5.7bc·)

10.7 ± 1.5ab

7.1 ± 1.5a

22.8 ± 6.8d

13.8 ± 2.2bc

13.0 ± 2.6bc

15.5 ± 4.0c

E. odorata

19.2 ± 9.6b

10.8 ± 1.2a

6.0 ± 0.0a

27.4 ± 10.7c

19.4 ± 5.6b

17.4 ± 4.1b

19.0 ± 0.0b

E. lehamnnii

11.5 ± 3.3bc

6.8 ± 0.7a

6.5 ± 0.8a

14.2 ± 4.8c

11.1 ± 1.4b

9.8 ± 2.4b

11.5 ± 1.7bc

E. leucoxylon

8.1 ± 2.2a

6.6 ± 1.1a

6.0 ± 0.0a

16.4 ± 5.4c

12.9 ± 1.8b

14.4 ± 3.0bc

9.0 ± 0.0a

E. bicostata

13.6 ± 5.0b

7.1 ± 1.4a

6.0 ± 0.0a

15.6 ± 2.8bc

13.8 ± 2.8b

17.0 ± 4.0c

13.0 ± 0.0b

E. astringens

13.0 ± 3.8bc

7.1 ± 1.6a

6.0 ± 0.0a

15.5 ± 5.2c

12.0 ± 3.2b

12.3 ± 12.3bc

12.5 ± 1.7bc

E. cinerea

13.0 ± 6.3b

8.5 ± 2.2a

6.2 ± 0.6a

12.2 ± 2.8b

11.6 ± 1.4b

11.5 ± 2.8b

12.5 ± 1.7b

E. sideroxylon

12.3 ± 8.4b

8.1 ± 1.8a

7.0 ± 1.5a

13.7 ± 3.8b

12.3 ± 1.6b

10.7 ± 2.5ab

12.0 ± 0.0b

Reference antibiotics

 

Ampicillin

30.5 ± 6.1c

NT

NT

NT

NT

NT

NT

Benzylpenicillin

(Penicillin G)

NT

NT

NT

24.5 ± 7.5a

NT

NT

NT

Ceftazidime

NT

22.3 ± 7.5a

23.8 ± 5.6a

NT

NT

NT

NT

Cehotaxime

20.7 ± 6.0b

NT

NT

NT

NT

NT

NT

Ciprofloxacin

NT

32.4 ± 2.9b

34.7 ± 5.0b

NT

NT

NT

Nt

Erythromycin

19.9 ± 4.2b

NT

NT

29.9 ± 5.1ab

29.2 ± 4.2b

26.3 ± 12.0a

29.0 ± 0.0c

Fosfomycin

NT

22.1 ± 2.9a

NT

34.3 ± 11.1c

27.9 ± 5.9ab

35.6 ± 5.5c

24.5 ± 0.8a

Gentamicin

NT

22.9 ± 5.0a

NT

29.6 ± 6.2ab

NT

NT

NT

Imipenem

NT

NT

24.6 ± 6.6a

NT

NT

NT

NT

Levofloxacin

NT

NT

NT

NT

24.8 ± 2.8a

27.3 ± 3.5ab

25.0 ± 1.5ab

Lincomycin

11.3 ± 1.8a

NT

NT

NT

NT

NT

NT

Oxacillin

NT

NT

NT

NT

33.6 ± 4.2c

31.7 ± 11.9abc

30.0 ± 0.0c

Piperacillin

NT

NT

25.3 ± 7.3a

NT

NT

NT

NT

Rifamycin

23.9 ± 4.7b

NT

NT

NT

34.4 ± 4.3c

37.5 ± 8.1c

31.5 ± 0.8d

Tetracyclin

29.2 ± 2.6c

NT

24.4 ± 6.1a

NT

NT

NT

NT

Vancomycin

NT

NT

Nt

25.3 ± 4.4a

26.3 ± 3.4ab

33.0 ± 3.5bc

26.0 ± 2.0 b

  1. *Values are means (mm. ±SD) of triplicate determination.
  2. ·) Values with different letters differ significantly by Duncan's multiple range test (p < 0.05).
  3. NT = Not tested.