Green synthesis of silver nanoparticles using <i>Eucalyptus leucoxylon</i> leaves extract and evaluating the antioxidant activities of extract

<div><p>This study was designed to examine the <i>in vitro</i> antioxidant activity of essential oil and methanol extracts of <i>Eucalyptus leucoxylon</i>. Furthermore, the polar fraction of the extract was used as a reducing agent for the green synthesis of silver nanoparticles (Ag NPs). Antioxidant activities of the samples were determined by using three different test systems, namely DPPH and β-carotene/linoleic acid and reducing power. The structure and composition of the prepared Ag NPs were characterised by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and UV–vis spectroscopy. Synthesised Ag NPs were almost spherical in shape with an average diameter of about ∼ 50 nm and synthesised within 120 min reaction time at room temperature.</p></div