Abstract
This paper presents a simple and eco-friendly method for the synthesis of silver nanoparticles (AgNPs) using licorice (Glycyrrhiza glabra) root extract and the evaluation of their antioxidant activity. UV-Vis spectroscopy, FTIR, TEM and EDX methods were used to characterize the AgNPs. The UV-Vis spectrum shows the characteristic surface plasmon resonance peak at 430 nm. The synthesized AgNPs have a spherical shape and are capped by biomolecules. Furthermore, FTIR spectra and EDX analysis demonstrate the presence of phytochemicals from extract which act as reducing and stabilizing agents. The presence of elemental silver was demonstrated by the peak at 3 keV from EDX spectra. The results following the DPPH free radical scavenging assay suggest that AgNPs present a better antioxidant activity compared to that of the extract. Therefore, the obtained results confirm that licorice represents a source of biomolecules that can be used for synthesizing AgNPs with antioxidant potential.
Highlights
Experimental part MaterialsAvailable plant material (licorice roots) was utilized for the preparation of the extract
This paper presents a simple and eco-friendly method for the synthesis of silver nanoparticles (AgNPs) using licorice (Glycyrrhiza glabra) root extract and the evaluation of their antioxidant activity
The present study proposes a new method for the synthesis of AgNPs using licorice root extract
Summary
Available plant material (licorice roots) was utilized for the preparation of the extract. Phytochemical analysis of licorice root extract The total phenolic content: The total phenolic content was determined using the Folin-Ciocalteu method [7]. The total phenolic content was expressed as mg gallic acid equivalents per gram of dried plant material (mg GAE/g plant). The total flavonoid content was expressed as mg quercetin equivalents per gram of dried plant material (mg QE/g plant). AgNPs, we determined the total content of phenolic compounds, flavonoids and phenolic acids using spectrophotometric methods. The following results were obtained after the analyses: total phenolic content -25.78 mg GAE/g plant, total flavonoids content -3.12 mg QE/g plant and total phenolic acids content -1.62 mg CAE/g plant. Using a HPLC-UV-MS method, the presence of caffeic, p-coumaric and ferulic acids, quercetin and apigenin in the extract was demonstrated. Taking into account the identity and amount of the determined compounds in the extract and their reducing properties, we proceeded to the AgNPs formation process
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