Chemical Sensors and Biosensors Based on Prussian Blues

Koncki, Robert

doi:10.1080/10408340290765452

Cited by 149 publications

(104 citation statements)

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“…The choice of inorganic and organic components for preparation of these composite materials is based on the excellent stability of the PEDOT layer in aqueous solution and its doped state [35][36][37], and the electrocatalytic activity of PB [38,39], respectively. The PEDOT organic component is in its conducting state in the potential region where the PB inorganic component exhibits its good electrocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Morphological characterization and analytical application of poly(3,4-ethylenedioxythiophene)–Prussian blue composite films electrodeposited in situ on platinum electrode chips

et al. 2011

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Section: Introductionmentioning

confidence: 99%

Morphological characterization and analytical application of poly(3,4-ethylenedioxythiophene)–Prussian blue composite films electrodeposited in situ on platinum electrode chips

et al. 2011

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Section: Preparation Of the Pb Modified Electrode And Electrocatalysismentioning

confidence: 99%

“…The thickness of the film was found to grow with each potential cycle (voltammograms not shown). When the modified electrode is thoroughly rinsed with water and a new voltammogram is recorded in electrolyte solution, the response is retained and two pairs of anodic and cathodic peaks are observed, corresponding respectively to the following electrodic processes (curve b, Figure 1) also reported in literature: [20][21][22] (1) (2) where A is the electrolyte anion.At the experimental conditions shown in Figure 1, a film with Γ = 3.0 × 10 -9 mol cm -2 was obtained by measuring the charge under the first process at 0.22 V. By adding hydrogen peroxide to the electrolyte solution and recording a new voltammogram (curve c, Figure 1) with the PB modified electrode, a remarkable current enhancement is noticed in the cathodic peak around 0.1 V. This reductive electrodic process associated with the decrease in the corresponding anodic peak constitutes a clear evidence of the electrocatalytic reduction of hydrogen peroxide. Figure 2 presents results on the comparison of the electrochemical behavior of PB modified electrodes prepared in the absence (PB) and presence (PB-CTAB) of CTAB in the working solution during film preparation as an attempt to corroborate the positive effects of the surfactant in the stability of the electrodeposited material.…”

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confidence: 99%

“…Accordingly, the use of PB and analogues modified electrodes to fabricate biosensors has been extensively described in literature, the enzymes being immobilized onto the surface of the film by different techniques. [19][20][21][22] Lactate is the key metabolite of anaerobic glycolytic pathway and its accurate determination is in growing demand in many fields such as clinical and sport medicine and the fermentation industry. Accordingly, we have already proposed the fabrication of a blood lactate biosensor and the influence of physical exercise on the lactate levels was clearly evidenced.…”

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confidence: 99%

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A biosensor based on immobilization of lactate oxidase in a PB-CTAB film for FIA determination of lactate in beer samples

Lowinsohn

Bertotti

2008

J. Braz. Chem. Soc.

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No presente trabalho são apresentados resultados referentes à fabricação de um biossensor para análise de lactato. O dispositivo foi preparado imobilizando-se a enzima lactato oxidase em filme de Azul da Prússia (PB, sigla em inglês) depositado na superfície de eletrodo de carbono vítreo em soluções de CTAB. Nestas condições experimentais observou-se melhoria na sensibilidade e seletividade das determinações de lactato, as quais foram conduzidas em sistema FIA com detecção amperométrica. Nas condições otimizadas (pH = 6,9 e E = −0,1 V), obteve-se curva analítica com limite superior igual a 0,28 mmol L -1 e um limite de detecção de 0,84 µmol L -1 . A repetibilidade do método foi avaliada por meio de injeções consecutivas de amostras de lactato 0,28 mmol L -1 , obtendo-se desvio padrão de 2,2 % (n = 18). O método foi aplicado em amostras de cerveja e houve boa concordância entre os resultados obtidos e aqueles oriundos do uso de procedimento espectrofotométrico de referência.An amperometric lactate biosensor with lactate oxidase immobilized into a Prussian Blue (PB) modified electrode was fabricated. The advantage of using cetyltrimethylammonium bromide (CTAB) in the electrodeposition step of PB films onto glassy carbon surfaces was confirmed taking into account both the stability and sensitivity of the measurements. The biosensor was used in the development of a FIA amperometric method for the determination of lactate. Under optimal operating conditions (pH = 6.9, E = −0.1 V), the linear response of the method was extended up to 0.28 mmol L -1 lactate with a limit of detection of 0.84 µmol L -1 . The repeatability of the method for injections of a 0.28 mmol L -1 lactate solution was 2.2 % (n = 18). The usefulness of the method was demonstrated by determining lactate in beer samples and the results were in good agreement with those obtained by using a reference spectrophotometric enzyme method.Keywords: lactate, biosensor, prussian blue modified electrodes, CTAB, FIA amperometric detection, beer IntroductionThe relevance of metal hexacyanoferrates for electroanalytical chemistry was firstly demonstrated in the pioneering studies of Itaya et al. 1,2 involving the electrocatalysis of oxygen and hydrogen peroxide reduction at surfaces covered by Prussian Blue (PB, iron(III) hexacyanoferrate(II)) films. The transfer of electrons and the movement of small hydrated counter-cations through the channels and holes of the solid for charge compensation is a typical feature of this kind of compound. Owing to the zeolite nature of metal hexacyanoferrates, their ability as effective three-dimensional electrocatalysts has been extensively recognized.Once sufficient negative potentials are applied to PB modified electrodes, electrons are injected into the film and the so-called Prussian-White film is generated which arises from the reduction of a high-spin Fe 3+ . The reduced form (Fe 2+ ) is catalytically active towards the electron-transfer step involving hydrogen peroxide, water being formed as a final product. At positive pot...

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“…Copper hexacyanoferrate (CuHCF) is one of the Prussian Blue analogues most commonly used to determine alkali cations [13,29], particularly potassium and sodium [30]. Some amperometric sensors based on CuHCF have been developed for the determination of hydrogen peroxide [31], sulphur dioxide [32], sulfhydryl [33] and traces of ammonia [34].…”

Section: Introductionmentioning

confidence: 99%

A new, improved sensor for ascorbate determination at copper hexacyanoferrate modified carbon film electrodes

2005

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A new, improved sensor for the electrocatalytic determination of ascorbate has been developed that has both a low applied operating potential and a low detection limit. The sensor was constructed by depositing copper hexacyanoferrate film either electrochemically or chemically onto carbon film electrode, and it was then characterised by cyclic voltammetry and electrochemical impedance spectroscopy. Chemically deposited films were shown to be the best for ascorbate determination and were used as an amperometric sensor at +0.05 V versus SCE to determine ascorbate in wines and juice. The linear range extended to 5 mM with a limit of detection of 2.1 lM, the sensor was stable for more than four months, and it could be used continuously for at least 20 days.

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Chemical Sensors and Biosensors Based on Prussian Blues

Cited by 149 publications

References 0 publications

Morphological characterization and analytical application of poly(3,4-ethylenedioxythiophene)–Prussian blue composite films electrodeposited in situ on platinum electrode chips

Morphological characterization and analytical application of poly(3,4-ethylenedioxythiophene)–Prussian blue composite films electrodeposited in situ on platinum electrode chips

A biosensor based on immobilization of lactate oxidase in a PB-CTAB film for FIA determination of lactate in beer samples

A new, improved sensor for ascorbate determination at copper hexacyanoferrate modified carbon film electrodes

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