The Chemical Featuring, Toxicity, and Antimicrobial Activity of Psidium cattleianum (Myrtaceae) Leaves

Table 3

Antibacterial activity of the ethanol extract and of the fractions from P. cattleianum leaves against the studied bacterial strains.

Strains

Inhibition zone diameter (mm)

Ethanol extract

Fraction

Control

Hexane

Dichloromethane

Ethyl acetate

Neg. control

Pos. control

DD

WD

DD

DP

DD

WD

DD

WD

DD

WD

DD

WD

S. aureus

9.0 ± 0.8

25 ± 2.0

—

—

—

14 ± 0.8

—

16 ± 0.4

—

—

32 ± 2.6

12 ± 0.8

S. epidermidis

11 ± 1.4

25 ± 2.4

—

—

—

18 ± 1.6

—

16 ± 1.2

—

—

15 ± 1.8

25 ± 1.6

B. cepacia

—

20 ± 0.8

—

—

—

8.0 ± 1.6

—

8.0 ± 1.4

—

—

15 ± 1.6

22 ± 1.4

E. coli

—

22 ± 1.6

—

—

—

16 ± 1.2

—

14 ± 0.8

—

—

23 ± 2.2

21 ± 0.8

DD: disc diffusion. WD: well diffusion. The symbol — indicates no inhibition zone formation.
Inhibition degrees: inactive (<9 mm inhibition zone), partially active (9–12 mm inhibition zone), active (12–18 mm inhibition zone), and active (>18 mm inhibition zone) [48]. The data are expressed as mean ± standard deviation. indicates statistical difference between the disc and well diffusion technique data, according to Student’s -test at 5% probability.