Preparation of Novel Arrays Silver Nanoparticles Modified Polyrutin Coat‐Paraffin‐Impregnated Graphite Electrode for Tyrosine and Tryptophan's Oxidation

Abstract

A novel array silver nanoparticles and Rutin complex film modified paraffin-impregnated graphite electrode was proposed in this work (denoted as Ag/Rutin/WGE). The characteristics were investigated by the field emission scanning electron microscopy (FE-SEM), infrared spectra (IR), UV-visible (UV), X-ray photoelectron spectroscopy (XPS) and electrochemical techniques. Silver ions were gradually chelated by polyrutin film at 4'-oxo-5'-OH and 5-OH-4-oxo sites accompanying adsorption, then. Silver nanoparticles were highly-dispersed electrodeposited on polyrutin film. The electrochemical behaviors of tyrosine (Tyr) and tryptophan (Trp) were studied by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. The Ag/Rutin/WGE electrode shows overlapping catalysis for the oxidation of Tyr and Trp. The linear response of Tyr and Trp were 0.3 -10.0 and 0.7 -70.0 mM with detection limit of 0.07 and 0.1 mM in a signal-to-noise ratio of 3.

Electrocatalytic Oxidation of Tryptophan at Gold Nanoparticle‐Modified Carbon Ionic Liquid Electrode

“…Incorporation of metal nanoparticles on the surface of electrodes has been suggested in order to enhance the electron transfer rate. Thus metal nanoparticle-modified electrodes are used increasingly in the determination of Trp [31][32][33]. The electrocatalytic oxidation of glutathione and Trp is individually and simultaneously investigated at the sur-face of modified carbon paste electrode by incorporating TiO 2 nanoparticles and ferrocene carboxylic acid [34].…”

“…The plot of peak currents was linearly dependent on v with linear equation of I p = 36.759 v + 1.456. This behavior indicates that the nature of redox process is adsorption-controlled [13,22,31]. In another experiment, GNP/CILE was maintained in a Trp solution (5 mM) for 5 min and then this electrode was placed in an electrochemical cell containing only phosphate buffer solution.…”

Electrochemical determination of tryptophan at room-temperature ionic liquid-titanium carbide nanoparticle gel modified electrode

“…However, electrochemical method for monitoring trp has shown promise compared to the methods above. It is well known that the electrochemical detection of trp at the unmodified electrode is not optimal owing to sluggish electron transfer processes and high over-potential [65]; so, lots of efforts have been contributed to seek the new material for electrode modification in order to promote the electron transfer and reduce the over-potential [66][67][68][69][70][71][72][73][74][75][76][77][78].…”

Electrophoretic Levitation and Focusing of Particles by Field Switching

“…In addition, the direct observation of particle behavior provide useful bases to design efficient ways for particle manipulation. 10,11 In analytical chemistry, particle manipulation facilitates various processes involved in analytical procedures, such as condensation, filtration, trapping, and sensing. 12,13 Such demands have become stronger with the recent developments of microfluidic devices.…”