Research Article

Evaluation of the Modulatory Effect of Annona muricata Extracts on the Activity of Some Selected Antibiotics against Biofilm-Forming MRSA

Table 7

Modulatory activity of extracts of various parts of A. muricata on some selected antibiotics against MRSA.

OrganismsMICs µg/mL of antibiotics + aqueous/ethanolic extracts of Annona muricata (0.5 µg/mL) against MRSA
Aqueous extracts
Ampicillin
RootStemLeafSeedPeel
ABMF/IMAABMF/IMAABMF/IMAABMF/IMAABMF/IMA

Methicillin-resistant Staphylococcus aureus (NCTC 12493)32.064.00.5 (−)32.064.00.5 (−)32.032.01.0 (=)32.064.00.5 (−)32.064.00.5 (−)
Tetracycline
32.08.04.0 (+)32.016.02.0 (+)32.016.02.0 (+)32.016.02.0 (+)32.016.02.0 (+)
Streptomycin
64.02.032.0 (+)64.04.016.0 (+)64.04.016.0 (+)64.016.04.0 (+)64.08.08.0 (+)
Ethanolic extracts
Ampicillin
64.032.02.0 (+)64.064.01.0 (=)64.08.08.0 (+)64.064.01.0 (=)64.016.04.0 (+)
Tetracycline
32.016.02.0 (+)32.016.02.0 (+)32.016.02.0 (+)32.016.02.0 (+)32.08.04.0 (+)
Streptomycin
64.016.04.0 (+)64.08.08.0 (+)64.04.016 (+)64.064.01.0 (=)64.08.08.0 (+)

IMA = interpretation of modulatory activity; MF = modulatory factor; (−) = antagonism; (+) = potentiation; (=) = intermediate; subinhibitory concentration of extract: 0.5 mg/mL, A: MIC of antibiotic alone (μg/mL); B: MIC of antibiotics in the presence of subinhibitory concentration of the extract (μg/mL).