In vitro inhibitory effects of the ethanol extract of Tetrapleura tetraptera (Schum and thonn.) taub. against multidrug resistant staphylococcus aureus

Abstract

In this study, the antibacterial effect of ethanol extract of Tetrapleura tetraptera was investigated in vitro against methicillin-resistant Staphylococcus aureus by agar diffusion and macrobroth dilution methods. At the lowest concentration of 20 mg/ml of the ethanol extract, 100 µl produced inhibition zones that ranged between 06 and 15 ± 1.0 mm while the inhibition zones ranged between 16 ± 1.0 mm and 22 ± 1.0 mm when the isolates were tested with 100 µl of the highest concentration (100 mg/ml) of ethanol extract. The minimum inhibitory concentrations (MICs) of the ethanol extract were between 0.019 mg/ml and 5.0 mg/ml while its minimum bactericidal concentrations (MBCs) ranged between 0.078 and 10.0 mg/ml. Ten strains had their MICs less than 1.0 mg/ml while the remaining S. aureus strains had their MICs at concentrations ranging between 1.25 mg/ml and 5.0 mg/ml. The degree of antibacterial activity exhibited by the extract of T. tetraptera demonstrated that its herbal medicine could be as effective as modern medicine in treating diseases associated with the test pathogenic organism and justifying its traditional use in the treatment of bacterial infections.

Keywords

• Antistaphylococcal activities
• inhibitory concentrations
• ethanol extract
• T. tetraptera