Abstract
In this paper, the electrochemical behavior of myricetin on a gold nanoparticle/ethylenediamine/multi-walled carbon-nanotube modified glassy carbon electrode (AuNPs/en/MWCNTs/GCE) has been investigated. Myricetin effectively accumulated on the AuNPs/en/MWCNTs/GCE and caused a pair of irreversible redox peaks at around 0.408 V and 0.191 V (vs. Ag/AgCl) in 0.1 mol L−1 phosphate buffer solution (pH 3.5) for oxidation and reduction reactions respectively. The heights of the redox peaks were significantly higher on AuNPs/en/MWNTs/GCE compare with MWCNTs/GC and there was no peak on bare GC. The electron-transfer reaction for myricetin on the surface of electrochemical sensor was controlled by adsorption. Some parameters including pH, accumulation potential, accumulation time and scan rate have been optimized. Under the optimum conditions, anodic peak current was proportional to myricetin concentration in the dynamic range of 5.0×10−8 to 4.0×10−5 mol L−1 with the detection limit of 1.2×10−8 mol L−1. The proposed method was successfully used for the determination of myricetin content in tea and fruit juices.
Highlights
At present, there has been an increasing usage of nano-materials and their applications in analytical chemistry due to their physicochemical characteristics
Characteristics of Au nanoparticles Gold nanoparticles (AuNPs)/en/MWCNTs/GCE MWCNTs were coated on GCE evenly and used to form pendant chains of ethylenediamine through electrochemical grafting
The final step was electrostatic assembly of citrate-capped AuNPs on en tether layers electrografted to MWCNTs (Fig. 1)
Summary
There has been an increasing usage of nano-materials and their applications in analytical chemistry due to their physicochemical characteristics. Gold nanoparticles possess some good properties, as quantized charging/discharging, conductivity, catalytic and photocatalytic activity [1,2,3,4]. Voltammetric sensors based on gold nanoparticles for determination of biological molecules have received much interest due to their good stability and biocompatibility [5]. Carbon nanotubes (CNTs) are another novel nano-material, which have captured worldwide researchers’ interests since their discovery in 1991 [6]. CNTs have ability to hold the potential for wide applications in electrochemistry due to their small dimensions, high surface area, high electrical conductivity, unique structures, significant mechanical strength and good chemical stability [7]. It was found that the modified electrode showed a constant activity for reduction of H2O2 [9]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
