A new electro-generated o-dianisidine derivative stabilized MWCNT-modified GCE for low potential gallic acid detection

Madhanagopal, Jagannathan; Kadir, Mohammed Rafiq Abdul; Sathishkumar, Palanivel; Hadibarata, Tony; Yusoff, Abdul Rahim Mohammed

doi:10.1039/c5ra06304c

Cited by 23 publications

(11 citation statements)

References 35 publications

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“…Therefore, the accurate determination of GA is a very important concern for human health. To date, many methods have been developed for the determination of GA, such as flow injection analysis [5], resonance light scattering [6], reversed phase high-performance liquid chromatography (HPLC) [7], high-pressure liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry (HPLC-ESI-QTOF-MS/MS) [2] electrochemical sensors and nano-structured sensors [1,[8][9][10]. Among these, electrochemical methods have received much attention lately, mainly due to their sensitivity, selectivity and simplicity.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Voltammetric Determination of Gallic and Protocatechuic Acids in Mango Juice Using a Reduced Graphene Oxide-Based Electrochemical Sensor

et al. 2019

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A simple and sensitive reduced graphene oxide-modified glassy carbon electrode-based electrochemical sensor was used for the concomitant determination of gallic acid (GA) and protocatechuic (PA) acid. The prepared sensor showed a significant enhancement in synergetic electro-catalytic performance towards GA and PA oxidation. A good resolution of the voltammetry peaks was obtained and a method of square wave voltammetry was developed for detection. The modified electrode was characterized by electrochemical techniques. The optimal experimental parameters were considered. GA and PA exhibited a linear increase in the peak currents with their concentrations in the range from 20 to 144 µmol·L−1 for GA and from 20 to 166 µmol·L−1 for PA, with limits of detection (S/N = 3) of 30.8 µmol·L−1 for GA and 10.2 µmol·L−1 for PA. The sensor applicability was simultaneously tested for the analytical determination of GA and PA in mango juice and exhibited a robust functionality.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Voltammetric Determination of Gallic and Protocatechuic Acids in Mango Juice Using a Reduced Graphene Oxide-Based Electrochemical Sensor

et al. 2019

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“…Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) have been used to investigate redox behaviour of polyphenols such as rutin and gallic acid as well as characterize polyphenols in wines , spices , tea , coffee and juices . In particular, wine has been extensively studied using CV to: 1) characterize polyphenols and study the antioxidant activity of red and white wines , 2) investigate the influence of glutathione, sulfur dioxide and ascorbic acid on polyphenol oxidation processes related to wine oxidation , and 3) estimate the total phenolic content in wine .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Radical Scavenging Capacity of Polyphenols Found in Natural Malaysian Honeys by Voltammetric Techniques

et al. 2018

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As minor constituents present in natural honey, polyphenols have the capacity as antioxidant by donating electron to halt detrimental actions of free radicals. The present work aims to analyze the electrochemical behaviour of polyphenols identified in Malaysian Apis and Trigona honey samples, determine and compare their reducing strengths as well as qualitatively evaluate the radical scavenging capacity of these phenolics in Malaysian honey samples. Six flavonoids, eight phenolic acids, and tannin pentagalloyl glucose (PGG) dissolved in 0.1 M PBS pH 7 were studied by cyclic voltammetry (CV). Seventeen Malaysian honey samples were analyzed using differential pulse voltammetry (DPV). Cyclic voltammograms revealed that polyphenols with catechol moiety in their structure exhibited Ep1a at low potentials, ranging between +0.173 V and +0.404 V. PGG and quercetin may have equal tendency to donate electron (same Ep1a) but higher peak current was observed for the former indicates its higher reducing strength, suggesting PGG as the strongest antioxidant among studied polyphenols. From DP voltammograms, oxidation of honey phenolics occurred in all honey samples with predominant catechol‐bearing peak P1 observed in nanas N1, kelulut K3 and tualang T1 honeys. The varied peak current intensities observed for P1‐P3 in all analyzed Malaysian honey samples suggested that these honey samples can act against free radicals at varying degree and thus are good sources of natural antioxidants.

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“…A sensor based on a carbon paste electrode modified with multiwalled carbon nanotubes was used for voltammetric determination of ellagic acid and gallic acid in an Myrtus communis , Punica granatum and Itriphal formulation [ 10 ]. Glassy carbon electrodes modified with a multiwalled carbon nanotube/ o -dianisidine derivative [ 11 ] and a molecularly imprinted polypyrrole polymer-based film [ 12 ] were used for gallic acid analysis with high selectivity. A bimediator amperometric sensor for gallic acid was fabricated by surface modification of a graphite electrode with thionine and nickel hexacyanoferrate [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Voltammetric determination of polyphenolic content in pomegranate juice using a poly(gallic acid)/multiwalled carbon nanotube modified electrode

Abdel-Hamid

Newair

2016

Beilstein J. Nanotechnol.

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SummaryA simple and sensitive poly(gallic acid)/multiwalled carbon nanotube modified glassy carbon electrode (PGA/MWCNT/GCE) electrochemical sensor was prepared for direct determination of the total phenolic content (TPC) as gallic acid equivalent. The GCE working electrode was electrochemically modified and characterized using scanning electron microscope (SEM), cyclic voltammetry (CV), chronoamperometry and chronocoulometry. It was found that gallic acid (GA) exhibits a superior electrochemical response on the PGA/MWCNT/GCE sensor in comparison with bare GCE. The results reveal that a PGA/MWCNT/GCE sensor can remarkably enhance the electro-oxidation signal of GA as well as shift the peak potentials towards less positive potential values. The dependence of peak current on accumulation potential, accumulation time and pH were investigated by square-wave voltammetry (SWV) to optimize the experimental conditions for the determination of GA. Using the optimized conditions, the sensor responded linearly to a GA concentration throughout the range of 4.97 × 10−6 to 3.38 × 10−5 M with a detection limit of 3.22 × 10−6 M (S/N = 3). The fabricated sensor shows good selectivity, stability, repeatability and (101%) recovery. The sensor was successfully utilized for the determination of total phenolic content in fresh pomegranate juice without interference of ascorbic acid, fructose, potassium nitrate and barbituric acid. The obtained data were compared with the standard Folin–Ciocalteu spectrophotometric results.

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A new electro-generated o-dianisidine derivative stabilized MWCNT-modified GCE for low potential gallic acid detection

Abstract: An enone derivative of a o-dianisidine dimer stabilized GCE/MWCNT exhibited low potential gallic acid detection at 0.16 V vs. Ag/AgCl.

Cited by 23 publications

References 35 publications

Simultaneous Voltammetric Determination of Gallic and Protocatechuic Acids in Mango Juice Using a Reduced Graphene Oxide-Based Electrochemical Sensor

Simultaneous Voltammetric Determination of Gallic and Protocatechuic Acids in Mango Juice Using a Reduced Graphene Oxide-Based Electrochemical Sensor

Evaluation of Radical Scavenging Capacity of Polyphenols Found in Natural Malaysian Honeys by Voltammetric Techniques

Voltammetric determination of polyphenolic content in pomegranate juice using a poly(gallic acid)/multiwalled carbon nanotube modified electrode

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