Abstract
This work focuses on the leaves and stems of Euphorbia nicaeensis All. to confirm its historical use by the Moroccan population. The phytochemical profile of the plant by HPLC-UV-MS/MS was identified for the first time, and the biological activities of each plant organ was evaluated separately by maceration and ultrasonic-assisted extraction. The evaluation of antioxidant activity based on DPPH assay and hydrogen peroxide scavenging assay showed that leaves could be used as a natural source of antioxidants as they provide a potent antioxidant effect (DPPH IC50 = 23.47±0.62 µg/ml), (H2O2 IC50 = 110.27 ± 3.59 µg/ml) compared to stems. These results were proven by HPLC-UV-MS/MS analysis and revealed that E. nicaeensis leaves are richer in phenolic compounds, especially quercetin and derivatives, known for their antioxidant properties. In contrast, the stems could be considered a potential anti-inflammatory agent considering their solid anti-inflammatory activity. The most potent effects were obtained at a concentration of 2 mg/ml, which induced 83.98% and 82.04% inhibition against bovine albumin and egg albumin denaturation, respectively, compared to the control. In addition, the stem phytochemical profile indicated the presence of some compounds with anti-inflammatory effects, such as fargesin and nuciferine. Likewise, the findings showed that ultrasound-assisted extraction was more effective than maceration.
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