|
چکیده
|
Electrochemistry, includes a huge collection of various phenomena, devices, and technologies that is widely used in all sciences and techniques [1]. On the other hand, the global market of natural products is driven by health and anti-aging products, which in most cases play an essential role against oxidative stress. Among these compounds, flavonoids and hydroxycinnamic acid derivatives, such as verbacoside (VB) (Scheme 1), are of particular interest due to their widespread occurrence in fruits and vegetables consumed by humans [2]. Due to their inherent antioxidant power, they have received considerable attention, and pharmacological studies of VB have reported a large variety of important biological properties [3]. In this work at first the biosynthesis of silver nanoparticles has been performed with the leaf extract of Aloysia citriodora. Synthesized nanoparticles were confirmed by UV-Visible, FT-IR, and SEM image. Silver nanoparticles, with large surface area, good biocompatibility, high conductivity and electrocatalysis characteristics, have been suitable for facilitate the transfer of electrons at the carbon paste electrode (CPE) [4]. In the second step, we constructed a sensitive electrochemical electrode based on silver nanoparticles, paraphine and graphite, as the working electrode for the electrooxidation of VB. Electrochemical behaviour of VB at the surface of this modified electrode investigated using cyclic voltammetry and differential pulse voltammetry techniques at the biological pH.
|