Résumé:
Phytotherapy, offering natural remedies is well accepted by the body. It is currently
undergoing an exceptional revival in the West due to the side effects induced by drugs, which
worry users who then turn to a gentler medicine. Also, our interest was focused on Urtica
dioïca L. is a medicinal plant belonging to the Urticaceae family, this species known as
"hourig" is widespread in the Algerian Tell. Plant very used in traditional medicine for its
many virtues. The objective of our work was to extract polyphenols from leaves and roots of
the nettle, and to evaluate the antimicrobial activity of the different extracts. The antimicrobial
activity was determined on ten bacterial strains, according to the agar diffusion method, the
disc method and the determination of MICs by the microdilution method on 96-well
microplates. All the extracts tested in our study reacted positively on at least one of the tested
microbial strains, which confirms that the plant U. dioïca L. is endowed with antimicrobial
properties.
