Olive oil wastewaters from northern Morocco: Physicochemical characterization and antibacterial activity of polyphenols

This work examines the influence of extraction system,growing season and production site on some physicochemical parameters of olive oil mill wastewaters (omw) samples generated in taza province (northern morocco). antibacterial activity of omw polyphenols extracts was tested against certain strains known for their pathogenicity. anova analysis showed that ph,electrical conductivity and total phenols content were mainly under the influence of the extraction system,while chlorides content variability was largely due to the effect of production site and its interaction with extraction system. moreover,mean comparison statistics revealed that the highest value of total phenols content was recorded in omw obtained using triple phase centrifugation decanter,whereas,omw released by super pressure revealed the lowest ph. among sites,bnifrassen exhibited higher values for electrical conductivity and chlorides content. significant difference was observed,between the two growing seasons,only for total phenols content. the two principal component (pc) axes accounted for 80% of total variance. pc1 was better explained by production site,while system extraction and growing season fitted pc2 variability. for the in vitro bioassays,omw polyphenols extracts showed a differential antibacterial activity against the four bacteria studied. this variability depends mainly on the tested microorganism and the concentration of polyphenols extract. in fact,a complete inhibition of growth forall the strains was observed at a concentration of 0.205 mg/ml of polyphenols. © 2017,university of mohammed premier oujda morocco.