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Aromatic plants embrace volatile compounds with efficiency in treating different diseases. In Jordan,  Syzygium aromaticum  flower buds (clove) are extensively used as folk medicine without awareness of its bio-safe dosage. Herein, clove buds were hydrodistilled using the Clevenger apparatus, and the resulting essential oil (CEO) was analyzed using Gas Chromatography-Mass Spectrometry (GC-MS). The antibacterial activity was evaluated against tested bacterial strains by agar diffusion test and micro-broth dilution assay. The antioxidant capacity was assessed using DPPH radical scavenging assay, while the cytotoxic potency was unraveled by determination of its anti-proliferative activity against MDA-MB-231 breast adenocarcinoma and normal Vero cell lines. CEO yield was 5.7 ± 1.3% (w/w); encompassed 24 volatile ingredients with eugenol as the principal compound (73.41%). The CEO inhibited the growth of both Gram-positive and Gram-negative bacterial test strains, causing the formation of 13.7 ± 1.5–17.3 ± 0.6 mm and 11.7 ± 1.5–20.7 ± 1.2 mm inhibition zones, respectively with MIC 1.25–5 μL/mL. Moreover, it showed antioxidant activity with IC 50  0.0016 ± 0.0001 μL/mL (1.6 ± 0.1 μg/mL, 2.98 ± 0.4 µg Trolox ® /µg CEO). Intriguingly, the CEO was cytotoxic against both cancerous and noncancerous cell lines at IC 50  of 0.25 ± 0.02 μL/mL and 0.18 ± 0.01 μL/mL, respectively. Herein results unveil the potential application of CEO as a pharmaceutical remedy with considering its bio-safe dosage.

zeitschrift für naturforschung c

Antibacterial, antioxidant, and cytotoxic activities of  Syzygium aromaticum  (L.) Merr. &amp; Perry essential oil with identification of its chemical constituents