Abstract
Polyphenols are biologically active molecules that contribute to development and cell growth. This study compared phenolic contents and antioxidant activity of stems and seeds in six Tunisian wild cardoon populations and one population of cultivated cardoon and artichoke located in the north of Tunisia. The analyzed organs exhibited different total polyphenol contents (1.49-23.25 mg gallic acid equivalents, GAE g-1 DW). The seeds phenolic and tannins contents were higher than those in stems. The globe artichoke stem phenolic and flavonoid contents were higher than those in wild and cultivated cardoons. Seed extracts displayed the highest DPPH scavenging ability with the lowest IC50 value (3 μg ml-1), followed by globe artichoke stems (12 μg ml-1). In contrast, stems showed the highest capacity to quench superoxide (IC50: 2.1 μg ml-1) as compared to seeds (5.6 μg ml-1). These results confirm the beneficial effect of Cynara cardunculus.L organs on human health due to their high antioxidant activity.
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