Abstract
Green nanotechnology has attracted much research interest because of its nontoxic and unique features of synthesized nanoparticles (NPs). Magnesium oxide (MgO) NPs were synthesized using the extract of Gracilaria edulis. The physicochemical properties of green-synthesized MgO NPs were characterized by using UV–visible spectroscopy, x-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy with energy dispersive analysis, transmission electron microscopy with selected area electron diffraction, zeta potential analysis and thermogravimetric analysis. All the results show that the synthesized particles were rod-shaped in the range of 50–200 nm. In addition, the anti-oxidant activity of G. edulis-mediated MgO NPs was assessed and showed good free radical scavenging activity. The results of the present study have revealed that G. edulis extract acts as a reducing and stabilizing agent, suggesting that this method might be a better alternative for the chemical synthesis of MgO NPs. The anti-oxidant activity was assessed using G.edulis-mediated MgO NPs by DPPH assay. The IC50 of G. edulis-mediated MgO NPs was found to be 94.86 ± 0.48 µg/ml. Moreover, the synthesized MgO NPs have good anti-oxidant activity, which might be used for several medicinal and pharmaceutical applications.
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