In our work, the primary phytochemical screening of the plant Centranthus longiflorus grown in Lebanon has been accomplished. Also, aqueous and methanolic extracts from this plant have been studied for their scavenger activity using three different in vitro tests, the DPPH, H2O2 and the iron chelating. The obtained results of the phytochemical screening showed the presence of flavonoids, phenols, essential oils, alkaloids and terpenoids. On the other hand, the DPPH test of the C. longiflorus showed a high antioxidant potential reaching 80 %. Moreover, the H2O2 test showed that this maximal antioxidant activity was 70 %. The iron-chelate test showed an antioxidant activity reaching 50 %. In conclusion, the obtained results of all of these tests demonstrated that this plant might be used in the prevention and in the treatment of different diseases related to oxidative stress.
