One of the serious problems the world is facing today is the antimicrobial resistance on available antibiotics by most bacterial pathogens and the rising cost of finding effective antimicrobial agents. In recent years...One of the serious problems the world is facing today is the antimicrobial resistance on available antibiotics by most bacterial pathogens and the rising cost of finding effective antimicrobial agents. In recent years, efforts to find new drugs especially from natural sources have been boosted by the demand for an effective cure for infectious diseases. Only the antibacterial activity of <em>apis mellifera</em> honey and not stingless bee honey from western Kenya has been reported. This study was therefore carried out to determine the effect of <em>Plebenia hylderbrandii </em>and <em>Meliponula bocandei </em>honey samples on the growth of control;sensitive cases of Escherichia coli (ATCC 25922) and <em>Staphylococcus aureus</em> (ATCC 25923). Different honey concentrations (1.18% - 17.65% v/v) of the two samples were tested against the two micro-organisms. The samples were screened for their antibacterial potential against <em>Escherichia coli </em>and <em>Staphylococcus aureus</em> by agar well dilution method. The Partial inhibitory concentration (PIC), minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values were determined by in vitro method. The inhibitory effect of <em>Plebenia hylderbrandii</em> honey on <em>E. coli</em> and <em>S. aureus</em> growth was apparent at concentrations 3.53% and 1.76% (v/v) respectively. On the other hand, the inhibitory effect of <em>Meliponula bocandei </em>honey on <em>S. aureus</em> growth was at concentration 16.47% (v/v). <em>Plebenia hylderbrandii</em> honey had bactericidal effect on both <em>E. coli </em>and <em>S. aureus</em> at concentrations 4.71% and 2.35% (v/v) respectively. However, <em>Meliponula bocandei</em> honey exerted bactericidal effect on <em>S. aureus </em>only at 16.47% (v/v) concentration. <em>Plebenia hylderbrandii </em>honey had higher antibacterial potency and can be a potential source of antibacterial substances. Moreover, the honeys tested in this study showed great antibacterial potential for <em>S. aureus</em>.展开更多
The aim of this study was to investigate the extraction method for R.tomentosa and C.zeylanicum leaves and the evaluation of antibacterial and antioxidant activities of crude extracts.The results of the study sh...The aim of this study was to investigate the extraction method for R.tomentosa and C.zeylanicum leaves and the evaluation of antibacterial and antioxidant activities of crude extracts.The results of the study showed that the active ingredients of crude extracts were clearly separated by Thin-layer chromatography and the presence of rhodomyrtone in R.tomentosa crude extract and cinnamaldehyde in C.zeylanicum crude extract.R.tomentosa crude extract was antibacterial activity against Staphylococcus aureus with 13.1 mm of inhibition zone,but is not effective against Salmonella Typhimurium.C.zeylanicum leaf extract did not show antibacterial activity on both S.aureus and S.Typhimurium.At a dilution of 1/2 of the R.tomentosa crude extract can completely inhibit S.aureus growth.This study also indicated the presence of antioxidant compounds such as flavonoids,tannins,phenols and terpenoids in C.zeylanicum and R.tomentosa crude extracts.The results showed that R.tomentosa and C.zeylanicum crude extracts should be used as a biotherapy alternative to antibiotic therapy.However,further study would be needed to investigate the antibacterial activity of crude extracts in vivo.展开更多
文摘One of the serious problems the world is facing today is the antimicrobial resistance on available antibiotics by most bacterial pathogens and the rising cost of finding effective antimicrobial agents. In recent years, efforts to find new drugs especially from natural sources have been boosted by the demand for an effective cure for infectious diseases. Only the antibacterial activity of <em>apis mellifera</em> honey and not stingless bee honey from western Kenya has been reported. This study was therefore carried out to determine the effect of <em>Plebenia hylderbrandii </em>and <em>Meliponula bocandei </em>honey samples on the growth of control;sensitive cases of Escherichia coli (ATCC 25922) and <em>Staphylococcus aureus</em> (ATCC 25923). Different honey concentrations (1.18% - 17.65% v/v) of the two samples were tested against the two micro-organisms. The samples were screened for their antibacterial potential against <em>Escherichia coli </em>and <em>Staphylococcus aureus</em> by agar well dilution method. The Partial inhibitory concentration (PIC), minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values were determined by in vitro method. The inhibitory effect of <em>Plebenia hylderbrandii</em> honey on <em>E. coli</em> and <em>S. aureus</em> growth was apparent at concentrations 3.53% and 1.76% (v/v) respectively. On the other hand, the inhibitory effect of <em>Meliponula bocandei </em>honey on <em>S. aureus</em> growth was at concentration 16.47% (v/v). <em>Plebenia hylderbrandii</em> honey had bactericidal effect on both <em>E. coli </em>and <em>S. aureus</em> at concentrations 4.71% and 2.35% (v/v) respectively. However, <em>Meliponula bocandei</em> honey exerted bactericidal effect on <em>S. aureus </em>only at 16.47% (v/v) concentration. <em>Plebenia hylderbrandii </em>honey had higher antibacterial potency and can be a potential source of antibacterial substances. Moreover, the honeys tested in this study showed great antibacterial potential for <em>S. aureus</em>.
文摘The aim of this study was to investigate the extraction method for R.tomentosa and C.zeylanicum leaves and the evaluation of antibacterial and antioxidant activities of crude extracts.The results of the study showed that the active ingredients of crude extracts were clearly separated by Thin-layer chromatography and the presence of rhodomyrtone in R.tomentosa crude extract and cinnamaldehyde in C.zeylanicum crude extract.R.tomentosa crude extract was antibacterial activity against Staphylococcus aureus with 13.1 mm of inhibition zone,but is not effective against Salmonella Typhimurium.C.zeylanicum leaf extract did not show antibacterial activity on both S.aureus and S.Typhimurium.At a dilution of 1/2 of the R.tomentosa crude extract can completely inhibit S.aureus growth.This study also indicated the presence of antioxidant compounds such as flavonoids,tannins,phenols and terpenoids in C.zeylanicum and R.tomentosa crude extracts.The results showed that R.tomentosa and C.zeylanicum crude extracts should be used as a biotherapy alternative to antibiotic therapy.However,further study would be needed to investigate the antibacterial activity of crude extracts in vivo.