Synthesis of Silver and Gold Nanoparticles from Rumex roseus Plant Extract and Their Application in Electrochemical Sensors

Abstract

The room-temperature synthesis of silver (AgNPs) and gold (AuNPs) nanoparticles from aqueous solution of AgNO3 and HAuCl4 respectively, using Rumex roseus (RR) plant extract as a reducing agent, is reported here for the first time. The nanoparticles obtained were characterized by UV-Vis spectroscopy, transmission electron microscopy (TEM) and dynamic light scattering (DLS). The formation of nanoparticles with spherical-shaped morphology was verified by TEM and confirmed by UV-Vis spectroscopy through the analysis of Ag and Au plasmon resonance peak and DLS measurements. New electrochemical sensors have been developed by employing the synthesized Ag and Au nanoparticles as modifiers of glassy carbon electrode (GCE) and screen-printed carbon electrode (SPCE), respectively. The AgNPs-modified GCE was investigated for the electrochemical determination of hydrogen peroxide (H2O2). Further enhancement of electrochemical performances was obtained using a nanocomposite made of AgNPs and reduced graphene oxide (rGO)-modified GCE. The AuNPs-SPCE sensor was instead tested in the electrochemical sensing of riboflavin (RF). To our knowledge, this is the first paper reporting Rumex roseus plant extract as a source for the synthesis of metal nanoparticles and their use for developing simple, sensitive and reliable electrochemical sensors for H2O2 and RF.

Electrochemical Detection of Dopamine and Riboflavine on a Screen-Printed Carbon Electrode Modified by AuNPs Derived fromRhanterium suaveolensPlant Extract

“…In this application, main interferences are possible due to the ions present in wastewater, such as Ca 2+ , Mg 2+ , K + , Cl – , and Na + , along with a variety of other pollutant organic molecules (sugars, phenols, other vitamins, etc.). As demonstrated in a previous paper using modified electrodes with AuNPs coming from another plant extract, the amperometric signal of the DA and RF analytes is not influenced by the presence of the above substances . Further, the same indication can be inferred from the CV technique analysis reported above in Figure b.…”

“…As demonstrated in a previous paper using modified electrodes with AuNPs coming from another plant extract, the amperometric signal of the DA and RF analytes is not influenced by the presence of the above substances. 41 Further, the same indication can be inferred from the CV technique analysis reported above in Figure 9b. The stability of the developed modified sensor has been also tested.…”

One-Step Phytofabrication Method of Silver and Gold Nanoparticles Using Haloxylon salicornicum for Anticancer, Antimicrobial, and Antioxidant Activities

“…The SPR of both H@AgNPs and H@Au-NPs indicate that these NPs have a median NP size. Chelly et al synthesized Ag- and Au-NPs using a methanolic extract of Rumex roseus , which have SPR at 429 and 549 nm, respectively [ 63 ]. Lomelí-Rosales et al synthesized Ag- and Au-NPs using aqueous extracts from the root, stem, and leaf of Capsicum chinense [ 20 ].…”

Effect of Graphene vs. Reduced Graphene Oxide in Gold Nanoparticles for Optical Biosensors—A Comparative Study

“…Although the use of composite materials based on metal nanoparticles and graphene allotropes to explore plasmonic properties in sensing applications has already been reported in the literature [13,14], a green method of synthesis for nanoparticle fabrication represents a novel approach in the preparation of hybrid materials. Since a residual layer of polyphenols remains on the surface of the nanoparticles, this approach results in the introduction of an additional factor in the set of parameters necessary to obtain the desired LSPR tuning which deserves to be investigated.…”