Poly(brilliant Cresyl Blue)-Modified Electrode for Highly Sensitive and Simultaneous Determination of Hydroquinone and Catechol

Abstract

A selective and highly sensitive electrochemical method, based on a poly(brilliant cresyl blue)-modified activated glassy carbon electrode, was developed for the simultaneous determination of hydroquinone (HQ) and catechol (CT). The modified electrode was characterized by cyclic voltammetry (CV). It was found that the modified electrode showed an excellent catalytic activity and enhanced reversibility toward the oxidation of both HQ and CT in 0.1 M phosphate buffer solution (PBS, pH 7.0). The peak-to-peak separations ( E p ) between oxidation and reduction waves in CV were decreased significantly from 360 and 285 mV at the bare electrode, to 59 and 56 mV at the poly(brilliant cresyl blue) modified electrode for HQ and CT respectively. Furthermore, the redox responses from the mixture of HQ and CT were easily resolved in both CV and differential pulse voltammetry (DPV). The oxidation peak currents of HQ and CT were linear up to 250 μM with the detection limits (S/N = 3) of 60 and 56 nM for HQ and CT, respectively. The developed sensor was successfully examined for real sample analysis with tap water and it showed a stable and reliable recovery data with high reproducibility.

Extraction, Analytical and Advanced Methods for Detection of Allura Red AC (E129) in Food and Beverages Products

“…Electrochemical sensors have been widely applied for the analysis of Allura Red in foods due to fast response, low cost, simple operation procedure, required small amount and high sensitivity ( Ahammad et al, 2011 ; Shaikh et al, 2013 ). It is feasible to miniaturize instrument for on-site detection.…”

The Cu-MOF-199/single-walled carbon nanotubes modified electrode for simultaneous determination of hydroquinone and catechol with extended linear ranges and lower detection limits

“…To date, various techniques, including spectrophotometry [3], chromatography [4], mass spectrometry [5], pH-based flow injection analysis [6], fluorescence [7] and electrochemical methods [8][9][10][11][12][13][14], have been applied to the detection of HQ and CT.…”

Sensitive and Simultaneous Determination of Hydroquinone and Catechol in Water Using an Anodized Glassy Carbon Electrode with Polymerized 2-(Phenylazo) Chromotropic Acid

“…Meanwhile, various electrochemical methods have attracted increasing attention due to their high sensitivity, simple operation, fast response, and low cost [4,[15][16][17]. Many modifiers such as mesoporous Pt [18], RGO-MWCNT [19], graphene/AuNPs/chitosan [20], Pt-MnO 2 [21], carbon nanofragment [22], and conducting polymers (CPs) [23] have been introduced to enhance the electrode performance. Especially, CPs are preferential in view of their easy preparation and surface homogeneity as well as good reproducibility and stability [24].…”