The synergistic effect between graphene oxide nanocolloids and silicon dioxide nanoparticles for gallic acid sensing

Chrys O Chikere,Carlos Fernandez,Paul Kong Thoo Lin,Nadimul Haque Faisal

doi:10.1007/s10008-019-04267-9

Chrys O Chikere, Carlos Fernandez + Show 2 more

Open Access

https://doi.org/10.1007/s10008-019-04267-9

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Abstract

For the first time, the synergistic effect of graphene oxide nanocolloids (nano-GO) and silicon dioxide (silica) nanoparticles (SiO2-nanoparicles) has been used to modify a glassy carbon electrode (GCE) for the determination of gallic acid (GA). The modified electrode surface was characterised by using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDXA) and Fourier transform infrared spectroscopy (FTIR). The electrochemical behaviour of the modified electrode was then studied, using cyclic voltammetry (CV) and differential pulse voltammetry (DPV), showing that the electrode was sensitive to GA in a concentration range of 6.25 × 10−6 to 1.0 × 10−3 mol L−1, with a correlation coefficient R2 of 0.9956 and a limit of detection of 2.09 × 10−6 mol L−1 (S/N = 3). The proposed method was successfully used for the determination of GA in red wine, white wine and orange juice, with recoveries of 102.3, 95.4 and 97.6%, respectively.Graphical abstract GRAPHICAL ABSTRACT small text inside the artwork. Please do not re-use the file that we have rejected or attempt to increase its resolution and re-save. It is originally poor, therefore, increasing the resolution will not solve the quality problem. We suggest that you provide us the original format. We prefer replacement figures containing vector/editable objects rather than embedded images. Preferred file formats are eps, ai, tiff and pdf.We have uploaded an updated graphical abstract in a PDF format

Highlights

Gallic acid (2,3,4-trihydroxybenzoic acid) (GA) is a naturally occurring phenolic compound in plants and is a natural antioxidant with several biological activities
The spherical particles had sizes ranging from 100 to about 200 nm, as can be seen in Fig. 1 a, whilst Fig. 1 b shows the morphology of the nanoGO-SiO2 nanoparticle mixture on the surface of the glassy carbon electrode (GCE)
Analytical application of the method. This analytical method with the nano-GO-SiO2 nanoparticle– modified electrode was used for the determination of gallic acid (GA) in red wine, white wine and orange juice

Summary

Introduction

Gallic acid (2,3,4-trihydroxybenzoic acid) (GA) is a naturally occurring phenolic compound in plants and is a natural antioxidant with several biological activities. The compound has shown its capacity as a reducing agent in the pharmaceutical industry and as a homoeopathic drug that can be found in tea, red wine, fruits (bananas, blueberries, grapes), beverages and several medicinal plants [1]. Several studies had shown GA to have anti-carcinogenic, antimutagenic and anti-oxidative properties [3]; it is recommended usage as an antioxidant in human diet. Oxidative stress has been linked to human diseases like Alzheimer’s disease, cardiovascular diseases, Parkinson’s disease, diabetes and cancer [5, 6]

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