Multisensor system based on bisphthalocyanine nanowires for the detection of antioxidants

Saja, J.A. de; Muñoz, Raquel; Rodrı́guez-Méndez, M.L.

doi:10.1016/j.electacta.2012.02.042

Cited by 31 publications

(19 citation statements)

References 43 publications

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“…Catechol is an important member of the family of phenols that can be found as an antioxidant in foods. Different types of electrodes have been described in the literature to assess the concentration of catechol in solution [1,2,3,4,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Sensors Modified with Combinations of Sulfur Containing Phthalocyanines and Capped Gold Nanoparticles: A Study of the Influence of the Nature of the Interaction between Sensing Materials

Ruiz-Carmuega¹,

García-Hernández²,

Ortíz³

et al. 2019

Nanomaterials

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Voltametric sensors formed by the combination of a sulfur-substituted zinc phthalocyanine (ZnPcRS) and gold nanoparticles capped with tetraoctylammonium bromide (AuNPtOcBr) have been developed. The influence of the nature of the interaction between both components in the response towards catechol has been evaluated. Electrodes modified with a mixture of nanoparticles and phthalocyanine (AuNPtOcBr/ZnPcRS) show an increase in the intensity of the peak associated with the reduction of catechol. Electrodes modified with a covalent adduct-both component are linked through a thioether bond-(AuNPtOcBr-S-ZnPcR), show an increase in the intensity of the oxidation peak. Voltammograms registered at increasing scan rates show that charge transfer coefficients are different in both types of electrodes confirming that the kinetics of the electrochemical reaction is influenced by the nature of the interaction between both electrocatalytic materials. The limits of detection attained are 0.9 × 10−6 mol∙L−1 for the electrode modified with the mixture AuNPtOcBr/ZnPcRS and 1.3 × 10−7 mol∙L−1 for the electrode modified with the covalent adduct AuNPtOcBr-S-ZnPcR. These results indicate that the establishment of covalent bonds between nanoparticles and phthalocyanines can be a good strategy to obtain sensors with enhanced performance, improving the charge transfer rate and the detection limits of voltammetric sensors.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Sensors Modified with Combinations of Sulfur Containing Phthalocyanines and Capped Gold Nanoparticles: A Study of the Influence of the Nature of the Interaction between Sensing Materials

Ruiz-Carmuega¹,

García-Hernández²,

Ortíz³

et al. 2019

Nanomaterials

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“…The electrocatalytic effect was stronger in C-LuPc 2 electrode, where an important improvement on the reversibility of the peaks and simultaneously higher intensity currents of the peaks were observed. It can be related to strong π-π interactions between the bis-phthalocyanine and the aromatic structure of catechol that can enhance the electron transfer rate [54,55]. The electrocatalytic activity of NiONPs is associated with their porosity and the mixed valence state found on the nanoparticle surface [56] and it has been already observed in other carbon electrodes [35].…”

Section: Electrochemical Characterization Of the Carbon Composite Elementioning

confidence: 91%

Analysis of Phenolic Content in Grape Seeds and Skins by Means of a Bio-Electronic Tongue

Garcı́a

Teixeira

Dias

et al. 2020

Sensors

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A bio-electronic tongue has been developed to evaluate the phenolic content of grape residues (seeds and skins) in a fast and easy way with industrial use in mind. A voltammetric electronic tongue has been designed based on carbon resin electrodes modified with tyrosinase combined with electron mediators. The presence of the phenoloxydase promotes the selectivity and specificity towards phenols. The results of multivariate analysis allowed discriminating seeds and skins according to their polyphenolic content. Partial least squares (PLS) has been used to establish regression models with parameters related to phenolic content measured by spectroscopic methods i.e., total poliphenol content (TPC) and Folin–Ciocalteu (FC) indexes. It has been shown that electronic tongue can be successfully used to predict parameters of interest with high correlation coefficients (higher than 0.99 in both calibration and prediction) and low residual errors. These values can even be improved using genetic algorithms for multivalent analysis. In this way, a fast and simple tool is available for the evaluation of these values. This advantage may be due to the fact that the electrochemical signals are directly related to the phenolic content.

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“…Phthalocyanines, which are tetrapyrrolic compounds, are efficient electrocatalysts for the non-enzymatic detection of phenols through axial ligand substitution [6] or through pÀp interactions [7,8]. They can also be used in combination with other electrocatalytic materials and synergistic effects have been observed [9][10][11][12]. In addition, phthalocyanines have been shown to be excellent electron mediators in biosensor functioning facilitating the transfer of electrons from the active site of immobilized phenol oxidases to the working electrode surface [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Subphthalocyanines as electron mediators in biosensors based on phenol oxidases: Application to the analysis of red wines

Gonzalez-Anton

Osipova

García-Hernández

et al. 2017

Electrochimica Acta

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The electron mediator properties of three subphthalocyanines (SubPcs) [hexa-chloro boron subphthalocyanine (ClSubPc), tri-tert-butyl boron subphthalocyanine (t-BuSubPc) and hexa-phenoxy boron subphthalocyanine (PhOSubPc)] in Tyrosinase and Laccase biosensors (deposited on ITO glass) for the detection of catechol and hydroquinone were evidenced. A particularly remarkable performance was observed in the PhOSubPc-Tyr sensor, which takes account of the p-p interactions between subphthalocyanine rings and the active sites of the enzymes. Mediated electron transfer between redox enzymes and the ITO electrode improved the limits of detection by one order of magnitude, reaching 10 À7 molÁL À1 values. Studies at increasing scan rates confirmed the improvement of the charge transfer rates caused by the presence of the SubPcs. A bioelectronic tongue formed by an array of the SubPc based biosensors has been able to discriminate red wines according to their Total Polyphenol Index.

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Multisensor system based on bisphthalocyanine nanowires for the detection of antioxidants

Cited by 31 publications

References 43 publications

Electrochemical Sensors Modified with Combinations of Sulfur Containing Phthalocyanines and Capped Gold Nanoparticles: A Study of the Influence of the Nature of the Interaction between Sensing Materials

Electrochemical Sensors Modified with Combinations of Sulfur Containing Phthalocyanines and Capped Gold Nanoparticles: A Study of the Influence of the Nature of the Interaction between Sensing Materials

Analysis of Phenolic Content in Grape Seeds and Skins by Means of a Bio-Electronic Tongue

Subphthalocyanines as electron mediators in biosensors based on phenol oxidases: Application to the analysis of red wines

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