Etude du contenu phénolique et de l’activité antioxydante du Citrus limon, Citrus clementina, Mentha spicata et Aloysia citrodora.

Abstract

The aim of this work was to determine the total polyphenols and flavonoids of four plants: lemon, orange, verbena, and mint, and to evaluate their antioxidant activity. The content of polyphenols and total flavonoids was determined by colorimetric methods. The obtained results showed that clementine peels contain a good content of total polyphenols, followed by mint leaves, lemon peels, and lastly verbena leaves with respective values of 3.38±0.07 mg GAE/g FM, 2.22±0.08 mg GAE/g FM, 2.13±0.01 mg GAE/g FM, and 0.43±0.03 mg GAE/g FM. For total flavonoids, clementine peels gave a good value followed by lemon peels, mint leaves, and verbena leaves with contents in the range of 1.89±0.03 mg QE/g FM, 1.1±0.09 mg QE/g FM, 0.91±0.06 mg QE/g FM and 0.30±0.011 mg QE/g FM, respectively. The antioxidant activity was evaluated by DPPH test, according to the results, clementine peel polyphenols show a good antioxidant effect with IC50 values of 0.125 mg/mL followed by mint phenolic extract (0.399 mg/mL), lemon peel (2.943 mg/mL), and finally verbena leaves (5.835 mg/mL).