ANTIMICROBIAL AND ANTIOXIDANT ACTIVITY of HYPERICUM PERFORATUM L., SALVIA OFFICINALIS L., ACHILLEA MILLEFOLIUM L. and GREEN TEA AQUEOUS EXTRACTS
Voronezh State Medical University, Dep. Chemistry The paper presents the findings of antimicrobial (in relation to Escherichia coli) and antioxidant activity of herbs and green tea aqueous extracts. It is found that catechines present possess only mild antimicrobial activity. The presence of (-)-epicatechine and particularly (-)-epicatechine-3- gallate contributes the increase of catechines antimicrobial activity in relation to gram-negative microorganisms. The comparative analyses of anti-oxidant properties of the aqueous extracts studied and their antimicrobial activity showed that antimicrobial activity of extracts is primarily influenced by the nature of biologically active substances in their composition rather than general antioxidant activity.