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Ziziphus lotus  L. (Lam.) and  Z .  mauritiana  Lam., as a widespread species in Tunisia, are well known for their medicinal and food uses. The aim of the present study was to screen the content of total polyphenols, flavonoids, and condensed tannins together with the radical scavenging capacity and the antimicrobial activity of leaves, fruits and seeds extracts of  Z .  lotus  and  Z .  mauritiana  from different localities. Results showed that leaves extracts presented the highest phenolic compounds content for both species. Furthermore, LC-ESI-MS analysis allowed the identification of 28 bioactive compounds regardless of species and organs, with the predominance of quinic acid and rutin. Leaves extract of  Z .  mauritiana  possessed the highest total antioxidant capacity. The antimicrobial tests showed that leaves extracts of  Z .  mauritiana  and  Z .  lotus  from Oued Esseder exhibited the highest activity against four bacterial strains ( Staphylococcus aureus ,  Listeria monocytogenes ,  Salmonella typhimurium  and  Escherichia coli ). The main results showed that the studied species of  Ziziphus  genus are an excellent source of natural bioactive molecules that could be an interesting material for industrial and food purposes.

Bioactive compounds, antioxidant and antimicrobial activities of extracts from different plant parts of two Ziziphus Mill. species