Poly(methylene blue)-modified electrode for indirect electrochemical sensing of OH radicals and radical scavengers

Braun, Walter Augusto; Horn, Bruna Carolina; Hoehne, Lucélia; Stülp, Simone; Rosa, Marcelo Barcellos da; Hilgemann, Maurício

doi:10.1590/0001-3765201720160833

Cited by 11 publications

(4 citation statements)

References 41 publications

(32 reference statements)

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“…In Figure 2c, a reductive peak at −0.48 V and two oxidative peaks for MB oxidation (red lines) at −0.04 V and −0.11 V were found at the modified electrodes in PBS buffer, pH 7.4. The possible appearance of two oxidative peaks of the leucomethylene blue due to the adsorption of the MB products has been reported in several studies [41][42][43][44][45]. It could be due to the protonation equilibrium of intermediates, which are hard to oxidize [45,46].…”

Section: Modification Of Au-spesmentioning

confidence: 80%

An Electrochemical Aptasensor for the Detection of Freshwater Cyanobacteria

Pham,

Maghsoomi,

Brandl

2024

Biosensors

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Aphanizomenon is a genus of cyanobacteria that is filamentous and nitrogen-fixing and inhabits aquatic environments. This genus is known as one of the major producers of cyanotoxins that can affect water quality after the bloom period. In this study, an electrochemical aptasensor is demonstrated using a specific aptamer to detect Aphanizomenon sp. ULC602 for the rapid and sensitive detection of this bacterium. The principal operation of the generated aptasensor is based on the conformational change in the aptamer attached to the electrode surface in the presence of the target bacterium, resulting in a decrease in the current peak, which is measured by square-wave voltammetry (SWV). This aptasensor has a limit of detection (LOD) of OD750~0.3, with an extension to OD750~1.2 and a sensitivity of 456.8 μA·OD750−1·cm−2 without interference from other cyanobacteria. This is the first aptasensor studied that provides rapid detection to monitor the spread of this bacterium quickly in a targeted manner.

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Section: Modification Of Au-spesmentioning

confidence: 80%

An Electrochemical Aptasensor for the Detection of Freshwater Cyanobacteria

Pham,

Maghsoomi,

Brandl

2024

Biosensors

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“…OH) . Electrochemical sensing of hydroxyl radicals based on the degradation of the polymer or self‐assembled monolayer on electrode surface induced by Fenton reaction has been reported . However, the excellent catalytic activity of Fenton reagent commonly requires acidic condition, which limits its application to a certain extent.…”

Section: Introductionmentioning

confidence: 76%

Electrochemical Determination of Vitamin B12 Based on Cu²⁺‐Involved Fenton‐like Reaction

Kou

Xiangmei

et al. 2019

Electroanalysis

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Poly(thionine) (PTH) film was generated on the electrochemically activated glassy carbon electrode (GCE(ea)) by using the two‐step cyclic voltammetric scan. Scanning electron microscopy, infrared spectral analysis and electrochemical measurement were employed to characterize the modified electrode surface. Hydroxyl radicals, which were produced by the Fenton‐like reaction, could induce the effective oxidization of PTH under near‐neutral condition and cause the notable enhancement of the cathodic peak current (Ipc) during the potential cycling process. Due to the binding of copper ions with the ligands liberated from VB12 and the inferior catalytic ability of Co2+ for the generation of hydroxyl radicals, the addition of VB12 into the Cu2+−H2O2 system inhibited the oxidization of PTH and resulted in the decrease of the Ipc value. The cathodic peak current change was linear with the logarithm of the VB12 concentration in the range of 10 nmol L−1–100 μmol L−1 with a detection limit of 2 nmol L−1 under optimal conditions. The developed sensor displayed excellent analytical performance including high sensitivity, good selectivity, acceptable reproducibility and satisfactory stability. The VB12 content in the injection sample was measured and the recovery values were in the range of 92.0 %–102 %.

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“…At first, there were a few peaks and the first anodic peak appeared at negative potential. As electropolymerization proceed, the anodic peak was reduced, and a peak appeared at positive potential (Braun et al 2017;Marinho et al 2012;Silber et al 1996).…”

Section: Resultsmentioning

confidence: 99%

Surface Modification of Cellulose Nanomaterial for Urea Biosensor Application

Khalid¹,

Lee²,

Arip³

2018

JSM

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Cellulose nanomaterial with rod-like structure and highly crystalline order, usually formed by elimination of the amorphous region from cellulose during acid hydrolysis. Cellulose nanomaterial with the property of biocompatibility and nontoxicity can be used for enzyme immobilization. In this work, urease enzyme was used as a model enzyme to study the surface modification of cellulose nanomaterial and its potential for biosensor application. The cellulose nanocrystal (CNC) surface was modified using 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation to introduce the carboxyl group at C6 primary alcohol. The success of enzyme immobilization and surface modification was confirmed using chemical tests and measured using UV-Visible spectrophotometer. The immobilization strategy was then applied for biosensor application for urea detection. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques were used for electroanalytical characterization of the urea biosensor.

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Poly(methylene blue)-modified electrode for indirect electrochemical sensing of OH radicals and radical scavengers

Cited by 11 publications

References 41 publications

An Electrochemical Aptasensor for the Detection of Freshwater Cyanobacteria

An Electrochemical Aptasensor for the Detection of Freshwater Cyanobacteria

Electrochemical Determination of Vitamin B12 Based on Cu²⁺‐Involved Fenton‐like Reaction

Surface Modification of Cellulose Nanomaterial for Urea Biosensor Application

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Poly(methylene blue)-modified electrode for indirect electrochemical sensing of OH radicals and radical scavengers

Cited by 11 publications

References 41 publications

An Electrochemical Aptasensor for the Detection of Freshwater Cyanobacteria

An Electrochemical Aptasensor for the Detection of Freshwater Cyanobacteria

Electrochemical Determination of Vitamin B12 Based on Cu2+‐Involved Fenton‐like Reaction

Surface Modification of Cellulose Nanomaterial for Urea Biosensor Application

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Electrochemical Determination of Vitamin B12 Based on Cu²⁺‐Involved Fenton‐like Reaction