Flower, stem, and leaf extracts from Hypericum perforatum L. to synthesize gold nanoparticles: Effectiveness and antioxidant activity

The significance of gold nanoparticles in nanobiotechnology and the trend towards development green methods synthesis has boosted research on use new natural resources, such as plants, reducing agents for formation nanoparticles. This article focuses Hypericum perforatum L., a plant known since ancient times its multiple applications treatment variety diseases. In this study, flowers, leaves, stems were separated their corresponding ethanolic extracts (HPF, HPL, HPS) extensively characterized used to synthesize was confirmed all cases by UV–Vis spectroscopy, which showed characteristic SPR band at around 540 nm. Furthermore, three types synthesized with each extract ([email protected], [email respectively) thoroughly means HRTEM, XRD, FTIR, DLS Z-potential. All obtained regular shape, spherical, mean diameters between 9.2 11.5 Finally, evaluation antioxidant activity both performed conducting vitro assays, revealing an enhanced DPPH radical scavenging capacity after (with IC50 values 0.11 ± 0.05 0.23 0.002 mg/mL protected]) comparison that 0.71 0.04, 0.03, 0.69 0.004 HPF, HPS, respectively). To best authors’ knowledge, is first detailed study aerial parts produce are fully characterized. Given therapeutic properties perforatum, it interesting possible synergistic enhancement those interaction