The bacterial cultures used were from the properly identified and appropriately maintained stock cultures from the Microbiological Research Laboratory, School of Pharmacy, The Robert Gordon University. The antibacterial test was performed using the 96-well micro-plate-based broth dilution method, also known as checkerboard assay (Lorian, 1991 and Kumarasamy et al., 2002). The calibration curves of absorbance versus colony counts of inoculum suspensions for each of the organisms were previously plotted according to the method described in literature (Richards and Xing, 1993). This was to ensure final cfu values were valid. Bacterial concentration of 5×106 cfu/ml was used. All tests were performed in triplicate. Ciprofloxacin, a well-known broad-spectrum antibiotic, was used as positive control.