Table 5.
Results of antibacterial and antifungal screening of different isolates from P. guajava L. leaf
| Dry extract/isolate | Inhibition zone (IZ) in mm |
|||
|---|---|---|---|---|
| Bacteria |
Fungi | |||
| Gram positive |
Gram negative |
C. albicans | ||
| S. aureus | E. coli | P. aeruginosea | ||
| Aq. ext. | 19 | 16 | 15 | 17 |
| 16% ethan. | 22 | 17 | 15 | 16 |
| 50% ethan. | 25 | 17 | 16 | 18 |
| 95% ethan. | 26 | 17 | 15 | 18 |
| P.E. | 24 | 19 | — | 16 |
| Chloroform. | 25 | 20 | — | 17 |
| Et. Ac. | 16 | 15 | — | 20 |
| But. | 24 | — | — | 17 |
| Quercetin | 28 | 17 | 18 | 17 |
| Quercetin-3-O-α-L-arabinofuranoside | — | 17 | — | 17 |
| Quercetin-3-O-β-D-arabinopyranoside | — | 20 | — | 18 |
| Ampicillin (10 µg/disk) | 35 | 11 | — | — |
| Clotrimazole (10 mg/ml) | — | — | — | 24 |
Aq. ext., aqueous extract; 16% ethan., ethanolic (16%) extract; 50% ethan., ethanolic (50%) extract; 95% ethan., ethanolic (95%) extract; P.E., petroleum ether fraction of the 50% alcoholic extract; chloroform, chloroform fraction of the 50% alcoholic extract; Et. Ac., ethyl acetate fraction of the 50% alcoholic extract; but., butanol fraction of the 50% alcoholic extract