Phytochemical and Biological Activities of Euphorbia clavarioides Boiss., a Traditional Wound-Healing Plant

Euphorbia clavarioides Boiss. is traditionally used in wound healing and other medicinal applications. Its bioactive compounds and pharmacological potential remain underexplored. This study investigated the phytochemical composition, antioxidant, anti-inflammatory, and anticancer activities of E. clavarioides Boiss. traditionally used in wound healing. Plant extracts were characterized using phytochemical screening, Fourier-transform infrared spectroscopy (FTIR), and liquid chromatography–mass spectrometry (LC-MS). Antioxidant activity was evaluated via DPPH and nitric oxide (NO) scavenging assays, anti-inflammatory effects through nitrite inhibition in LPS-stimulated RAW 264.7 macrophages, and anticancer potential using the MTT assay against DU-145, PC-3, SKU-T, and AGS cell lines. Phytochemical screening confirmed tannins, phlobatannins, saponins, flavonoids, alkaloids, steroids, terpenoids, and cardiac glycosides. FTIR spectra of aqueous extracts revealed peaks at 2990.66 cm−1 (O–H), 1738.68 cm−1 (C=O), 1217.22 cm−1 (C–N), and 527.37 cm−1 (C–Cl). LC-MS profiling identified diverse metabolites, including phenolics (pseudolaroside B, cinnamtannin A2, (−)-medicarpin, butyrolactol A) and terpenoids (zerumbone, sclareol isomer, diterpenoid-like compounds), underpinning the plant’s bioactivity. Methanol extracts exhibited the strongest DPPH scavenging activity (IC50 = 755.71 µg/mL), whereas aqueous and ethanol extracts demonstrated superior NO scavenging. Ethanol extracts showed maximal anti-inflammatory activity, while aqueous extracts induced pro-inflammatory effects. Cytotoxicity assays indicated negligible toxicity. In anticancer assays, ethanol and methanol extracts significantly inhibited the proliferation of all tested cell lines at 100 µg/mL, exceeding drug control, whereas aqueous extracts displayed lower activity. The bioactive compounds in E. clavarioides support its traditional wound-healing use and demonstrate mechanistic antioxidant, anti-inflammatory, and anticancer activities, highlighting its potential as a source of multi-target natural therapeutics.