The Antibacterial Activity Screening of the Extracts of Some Moroccan Medicinal Plants

Abstract

The antibacterial and antifungal activities of some Moroccan medicinal plants extracts were evaluated against six bacterial species and three yeasts. The agar diffusion method was used to evaluate the antimicrobial activity of the extracts of the following medicinal plants: Rosmarinus officinalis, Salvia officinalis, Psidium guajava, Crocus sativus, Dysphania ambrosioides, Trigonella foenum graecum and Cymbopogon citratus. The used standard antibiotic is the Ampicillin 30µg, and the standard antifungal is the Econazole30µg. The highest antibacterial activity was observed for the extracts of Rosmarinus offficinalis (16,6mm<d<26mm) and Salvia offficinalis (18mm<d<22mm) , which are very close to that of some standard antibiotic (ampicilline 30µg) who recorded zones of inhibition from 24 to 29 mm. In the second class there is Psidium guajava extracts, with a moderate antibacterial activity (9mm<d<12mm) against Pseudomonas.sp, Staphylococcus aureus, Enterococcus faecalis and Escherichia. coli. The extract of Crocus sativus, Trigonella foenum graecum and Cymbopogon citratus showed a low antibacterial activity ((8mm<d<9mm), against four bacterial strains among five tested. No antimicrobial activity was obtained for Dysphania ambrosioides extracts. This study proves, in part, that excepted Dysphania ambrosioides all the studied medicinal plants extracts have a good antibacterial activity, so they can establish a source of alternative antibiotics in the pharmaceutical industry. On the other hand, the species of these studied medicinal plants could be valuable due to their bioactive compounds. The results confirm also the ethnobotanical importance of the screened plants for the treatment of some bacterial infections.

Antibacterial Effect of Different Herbal Extracts Against Listeria monocytogenes Strains Isolated from Foods

“…Celiktas et al (2007) reported in their study that methanol extracts of rosemary showed low activity against S. aureus but ineffective against other microorganisms. However, in another study, rosemary extracted in ethanol and dichloromethane had a high antimicrobial effect against E. coli and Pseudomonas sp., with inhibition zone diameters ranging from 16.6 -26 mm (Lahlou et al, 2019). The antibacterial effect of rosemary is suggested to be due to its compounds such as flavonoids and phenolics (Lahlou et al, 2019).…”