Langmuir–Blodgett films from polyaniline/ruthenium complexes as modified electrodes for detection of dopamine

Ferreira, Marystela

doi:10.1016/j.tsf.2003.10.006

Cited by 62 publications

(32 citation statements)

References 24 publications

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“…DA was added with concentrations ranging from 25 to 90 x 10 -6 mol/L. The detection limit [49] (DL) was estimated for PAH/CuTsPc, PAH/Cashew/PAH/CuTsPc and PAH/Angico/PAH/CuTsPc electrodes as show the Table 4, which is in good agreement with previously reported results [20,39,48]. For example, detection limits of 10 -5 mol/L have been reported by Siqueira et al, for LbL films of chitosan assembled with three types of sulfonated phthalocyanines containing iron (FeTsPc), nickel (NiTsPc), or copper (CuTsPc) [39].…”

Section: Dopamine Sensingsupporting

confidence: 87%

“…A five-tetralayer of LbL films (sequence 1) was employed here as a modified electrode for DA detection. The DA oxidation through a two electron process [47,48] was evidenced by the increase in the peak current upon addition of DA in the electrochemical cell during the voltammetric measurements, as shown in Figure 13. DA was added with concentrations ranging from 25 to 90 x 10 -6 mol/L.…”

Section: Dopamine Sensingmentioning

confidence: 99%

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Influence of Natural Polysaccharides on the Redox Processes of CuTsPc Thin Films and Dopamine Sensing

Moura¹

2013

IJMSA

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Abstract:Energy diagrams have been obtained for copper tetrasulfonated phthalocyanine (CuTsPc) from electrochemical and electronic absorption measurements in layer-by-layer (LbL) films with cashew (Anacardium occidentale L.) and angico branco (Anadenanthera colubrina) natural polysaccharides in the anionic layers. In this study, LbL films were produced with either copper tetrasulfonated phthalocyanine or polysaccharides (cashew or angico branco). Since CuTsPc and the gums are polyanions, the multilayer deposition was carried out in a tetralayer fashion, in which a conventional cationic polyelectrolyte, namely poly (allylamine hydrochloride) (PAH), was interposed between the polyanionic layers. An alternative for the simultaneous determination of electrochemical signals was using the deconvolution procedure. Mathematical deconvolution of the peaks followed Gaussian analysis. The presence of the gum led to increased adsorption of the phthalocyanine, and enhanced the UV-VIS absorption and electrochemical response of the films. Furthermore, modified electrodes based on polysaccharides/phthalocyanine films were able to detect dopamine at concentrations as low as 10 -5 mol/L.

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Section: Dopamine Sensingsupporting

confidence: 87%

Section: Dopamine Sensingmentioning

confidence: 99%

Influence of Natural Polysaccharides on the Redox Processes of CuTsPc Thin Films and Dopamine Sensing

Moura¹

2013

IJMSA

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“…Although this concentration is not sufficiently low for a viable in vivo dopamine sensor, it may be possible to reach lower detection limits by using pulsed techniques, such as differential pulse voltammetry, or by miniaturising the electrode. Interestingly, a limit of detection of 4.0 × 10 −5 M dopamine, obtained by Ferreira et al [38], was sufficient to detect dopamine in a pharmaceutical product. Therefore, the polypyrrole sulfonated ␤-cyclodextrin modified electrode may have potential in this area.…”

Section: Sensitivity Of the Polypyrrole Sulfonatedˇ-cyclodextrin Filmmentioning

confidence: 93%

The selective detection of dopamine at a polypyrrole film doped with sulfonated β-cyclodextrins

Harley

Rooney

Breslin

2010

Sensors and Actuators B: Chemical

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a b s t r a c t A highly selective dopamine sensor was fabricated by doping polypyrrole with a sulfonated ␤-cyclodextrin. This composite material enabled the selective sensing of dopamine in the presence of a large excess of ascorbic acid and prevented the regeneration of dopamine through the homogeneous catalytic reaction of the ascorbate anion with the dopamine-o-quinone. A single redox wave, corresponding to the oxidation of dopamine, was observed in dopamine/ascorbate mixtures, giving a truly selective dopamine sensor. The limit of detection was measured as 3.2 × 10 −6 M for dopamine.

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“…1, 2007 between polyaniline (PANI) and a complex mer-[RuCl 3 (dppb)(pyridine)]. 11 The analytical parameters (LOD, Sensitivity, Linear Regression Equation, Linear Range of Concentration) related to the individual determination of dopamine and ascorbic acid by cyclic voltammetry and carbon paste electrode modified by a mer-[RuCl 3 (dppb)(4-pic)] complex are summarized in Table 1. The plots of the anodic current peak against AA or DA concentrations were linear in a wide range of concentration, observing a better sensitivity for DA.…”

Section: Electrocatalytic Oxidation Of Dopamine and Ascorbic Acidmentioning

confidence: 99%

Simultaneous voltammetric determination of dopamine and ascorbic acid using multivariate calibration methodology performed on a carbon paste electrode modified by a mer-[RuCl3(dppb)(4-pic)] complex

Santos¹,

Sandrino²,

Moreira³

et al. 2007

J. Braz. Chem. Soc.

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A preparação e caracterização eletroquímica do eletrodo de pasta de carbono (EPC) modificado com o mer- [RuCl 3 (dppb)(4-pic)] (dppb= Ph 2 P(CH 2 ) 4 PPh 2 , 4-pic= CH 3 C 5 H 4 N), denominado Rupic, foi investigada. O sistema EPC/Rupic apresentou apenas um par de picos com potencial médio de 0,28 V vs. Ag/AgCl, o qual foi atribuído ao processo de transferência de elétrons do Ru III /Ru II . Este eletrodo modificado apresentou a propriedade de eletrocatalisar a oxidação da dopamina (DA) e do ácido ascórbico (AA) em 0,35 V e 0,30 V, respectivamente. Como a oxidação dos analitos, AA e DA, ocorreu praticamente no mesmo potencial, não foi possível a distinção dos sinais voltamétricos utilizando-se a voltametria cíclica. Esta limitação foi resolvida empregando-se a Regressão de Mínimos Quadrados Parciais (PLSR), a qual permitiu a determinação de quatro amostras sintéticas, com erros de previsão (RMSEP) de 5,55×10 -5 mol L -1 e 7,48×10 -6 mol L -1 para DA e AA, respectivamente.The preparation and electrochemical characterization of a carbon paste electrode (CPE) modified with mer-[Ru0Cl 3 (dppb)(4-pic)] (dppb=Ph 2 P(CH 2 ) 4 PPh 2 , 4-pic=CH 3 C 5 H 4 N), referred to as Rupic, were investigated. The CPE/Rupic system displayed only one pair of redox peaks, with a midpoint potential at 0.28 V vs. Ag/AgCl, which were ascribed to Ru III /Ru II charge transfer. This modified electrode presented the property of electrocatalysing the oxidation of dopamine (DA) and ascorbic acid (AA) at 0.35 V and 0.30 V vs. Ag/AgCl, respectively. Because the oxidation for both AA and DA practically occurred at the same potential, distinguishing between them was difficult with cyclic voltammetry. This limitation was overcome using Partial Least Square Regression (PLSR), which allowed us, with the optimised models, to determine four synthetic samples with prediction errors (RMSEP) of 5.55×10 -5 mol L -1 and 7.48×10 -6 mol L -1 for DA and AA, respectively. Keywords: carbon paste electrodes, ruthenium complexes, dopamine, ascorbic acid, multivariate calibration methodology IntroductionConsiderable progress has been made over the last few years on chemically modified carbon paste electrodes, having an easier and faster procedure to assemble and renew the paste surfaces, low cost, background currents and possibility to incorporate a series of materials. [1][2][3][4][5] Among the materials that may be used in conjunction with carbon paste are the ruthenium-containing compounds such as oxides, mixed valence compounds and complexes. These Ru-based materials possess electrocatalytic properties, which have been used to modify electrodes for electroanalysis of ascorbic acid, 6,7 L-dopa, 8 glucose, 9 benzylic compounds 10 and dopamine. 11 Dopamine (DA) and ascorbic acid (AA), in particular, are relevant from the biomedical and neurochemical point of view, for their importance to human metabolism. DA is involved in the functioning of the central nervous system, in addition to the cardiovascular, renal and hormonal systems, and plays an important role in ...

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Langmuir–Blodgett films from polyaniline/ruthenium complexes as modified electrodes for detection of dopamine

Cited by 62 publications

References 24 publications

Influence of Natural Polysaccharides on the Redox Processes of CuTsPc Thin Films and Dopamine Sensing

Influence of Natural Polysaccharides on the Redox Processes of CuTsPc Thin Films and Dopamine Sensing

The selective detection of dopamine at a polypyrrole film doped with sulfonated β-cyclodextrins

Simultaneous voltammetric determination of dopamine and ascorbic acid using multivariate calibration methodology performed on a carbon paste electrode modified by a mer-[RuCl3(dppb)(4-pic)] complex

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