Electrochemical study of antioxidants at a polypyrrole electrode modified by a nickel phthalocyanine complex. Application to their HPLC separation and to their FIA system detections

Riber, J; Fuente, Concepción de la; Vázquez, M.D.; Tascón, M.L.; Batanero, P. Sánchez

doi:10.1016/s0039-9140(00)00324-6

Cited by 40 publications

(17 citation statements)

References 14 publications

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“…Many methods for determining BHA and BHT individually or simultaneously have been recently reported, based on spectrophotometry (Capitan-Vallvey, Valencia, & Nicolas, 2004), liquid and gas chromatography (Guo, Xie, Yan, Wan, & Wu, 2006;Perrin & Meyer, 2002;Saad et al, 2007), micellar electrokinetic chromatography (Delgado-Zamarreno et al, 2007;Guan et al, 2006), and flow injection and HPLC with amperometric detection (Luque, Rios, & Valcarcel, 1999;Riber, de la Fuente, Vazquez, Tascon, & Batanero, 2000;Ruiz, Garcia-Moreno, Barbas, & Pingarron, 1999). But they are prone to many drawbacks, such as expensiveness, complicated and lengthy procedures, and unsuitability for field use.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous voltammetric determination of phenolic antioxidants in food using a boron-doped diamond electrode

2010

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Section: Introductionmentioning

confidence: 99%

Simultaneous voltammetric determination of phenolic antioxidants in food using a boron-doped diamond electrode

2010

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“…Independently the working electrodes with chemically modified surfaces have been developed. Modification of carbon electrodes [8,59,60], carbon-paste electrodes [38,61] or polypyrrol electrode [62,63] were described for determination of antioxidants in various types of samples, most often using the complex of nickel phthalocyanine or various polymers. In contrast to chromatography, the electrochemical methods can have the drawback of insufficient selectivity of determination in analyses of antioxidant mixtures.…”

Section: Central European Journal Of Chemistrymentioning

confidence: 99%

Differentiation between phenol- and amino-substances in voltammetry determination of synthetic antioxidants in oils

et al. 2010

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Abstract:The paper describes a method of voltammetric determination of antioxidants in lubricating oils developed with the use of Linear Sweep Voltammetry (LSV) and Fast Scan Differential Pulse Voltammetry (FSDPV). Experimental conditions have been found for simultaneous determination of phenol-based antioxidants and amino-antioxidants: the phenols can be electrochemically oxidized using the polarisation of gold disc electrode (AuDE) in the potential range of 0-1400 mV in 0.2 M H 2 SO 4 in the presence of ethanol and acetonitrile at the ratio of 3:1. Secondary aromatic amines can be determined directly in this supporting electrolyte; the presence of phenolic antioxidants does not interfere with this analysis. On the other hand, secondary aromatic amines interfere with the determination of phenolic substances; therefore, the amines present have to be eliminated in a suitable way. A procedure for masking the aromatic amines using their reaction with nitrous acid has been suggested and optimised. The nitrosamines thus formed can be used for sensitive and selective determination of amino-antioxidants by means of cathodic reduction on the hanging mercury drop electrode (HMDE) using Fast Scan Differential Pulse Voltammetry. The method was applied in analysis of real samples of lubricating oils. © Versita Sp. z o.o.

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“…For modification of working electrodes for amperometric detection in HPLC conducting electrodeposited polymers are used also. For detection of nitrite a GC electrode modified with polypyrrole (PPy) doped with tungstodiphosphate anion was used [147], while a PPy electrode modified with a tetrasulfonated nickel(II) phthalocyanine complex was employed for HPLC amperometric determination of alimentary antioxidants in food products [148]. For determination of amino acids a poly(3-methylthiophene)-coated carbon fiber microelectrode was used [149].…”

Section: Voltammetric Detection In Liquid Chromatographymentioning

confidence: 99%

Electroanalytical Flow Measurements–Recent Advances

2003

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As general trends in current development of chemical analysis, including electroanalysis, one can indicate a search for methods fast and multianalyte, for miniaturized measuring devices, mechanization and automation of analytical processes. In all these trends a significant role is played by measurements in flow conditions. The major advantage of flow electroanalysis is a possibility of utilizing a kinetic discrimination in potentiometric measurements and enhancement of mass transport in voltammetric techniques. Flow injection techniques provide shortening of time of a single analytical determination due to reproducible use of transient signal from the detector without need of obtaining a steady-state equilibrium signal. Electrochemical detection in HPLC gives often improved selectivity and detection limit for electroactive solutes, whereas in capillary electrophoresis it allows a convenient design of portable, integrated chips for field application. This review presents state-of-the -art of flow electroanalysis based on 226 cited literature references

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Electrochemical study of antioxidants at a polypyrrole electrode modified by a nickel phthalocyanine complex. Application to their HPLC separation and to their FIA system detections

Cited by 40 publications

References 14 publications

Simultaneous voltammetric determination of phenolic antioxidants in food using a boron-doped diamond electrode

Simultaneous voltammetric determination of phenolic antioxidants in food using a boron-doped diamond electrode

Differentiation between phenol- and amino-substances in voltammetry determination of synthetic antioxidants in oils

Electroanalytical Flow Measurements–Recent Advances

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