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Amorphous carbon nitride as an alternative electrode material in electroanalysis: simultaneous determination of dopamine and ascorbic acid.
Anal Chim Acta. 2013 Oct 03; 797:30-9.AC

Abstract

Boron-doped diamond (BDD) films are excellent electrode materials, whose electrochemical activity for some analytes can be tuned by controlling their surface termination, most commonly either to predominantly hydrogen or oxygen. This tuning can be accomplished by e.g. suitable cathodic or anodic electrochemical pretreatments. Recently, it has been shown that amorphous carbon nitride (a-CNx) films may present electrochemical characteristics similar to those of BDD, including the influence of surface termination on their electrochemical activity toward some analytes. In this work, we report for the first time a complete electroanalytical method using an a-CNx electrode. Thus, an a-CNx film deposited on a stainless steel foil by DC magnetron sputtering is proposed as an alternative electrode for the simultaneous determination of dopamine (DA) and ascorbic acid (AA) in synthetic biological samples by square-wave voltammetry. The obtained results are compared with those attained using a BDD electrode. For both electrodes, a same anodic pretreatment in 0.1 mol L(-1) KOH was necessary to attain an adequate and equivalent separation of the DA and AA oxidation potential peaks of about 330 mV. The detection limits obtained for the simultaneous determination of these analytes using the a-CNx electrode were 0.0656 μmol L(-1) for DA and 1.05 μmol L(-1) for AA, whereas with the BDD electrode these values were 0.283 μmol L(-1) and 0.968 μmol L(-1), respectively. Furthermore, the results obtained in the analysis of the analytes in synthetic biological samples were satisfactory, attesting the potential application of the a-CNx electrode in electroanalysis.

Authors+Show Affiliations

Departamento de Química, Universidade Federal de São Carlos, C.P. 676, 13560-970 São Carlos, SP, Brazil. Electronic address: roantigo@hotmail.com.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24050667

Citation

Medeiros, Roberta A., et al. "Amorphous Carbon Nitride as an Alternative Electrode Material in Electroanalysis: Simultaneous Determination of Dopamine and Ascorbic Acid." Analytica Chimica Acta, vol. 797, 2013, pp. 30-9.
Medeiros RA, Matos R, Benchikh A, et al. Amorphous carbon nitride as an alternative electrode material in electroanalysis: simultaneous determination of dopamine and ascorbic acid. Anal Chim Acta. 2013;797:30-9.
Medeiros, R. A., Matos, R., Benchikh, A., Saidani, B., Debiemme-Chouvy, C., Deslouis, C., Rocha-Filho, R. C., & Fatibello-Filho, O. (2013). Amorphous carbon nitride as an alternative electrode material in electroanalysis: simultaneous determination of dopamine and ascorbic acid. Analytica Chimica Acta, 797, 30-9. https://doi.org/10.1016/j.aca.2013.08.018
Medeiros RA, et al. Amorphous Carbon Nitride as an Alternative Electrode Material in Electroanalysis: Simultaneous Determination of Dopamine and Ascorbic Acid. Anal Chim Acta. 2013 Oct 3;797:30-9. PubMed PMID: 24050667.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Amorphous carbon nitride as an alternative electrode material in electroanalysis: simultaneous determination of dopamine and ascorbic acid. AU - Medeiros,Roberta A, AU - Matos,Roberto, AU - Benchikh,Abdelkader, AU - Saidani,Boualem, AU - Debiemme-Chouvy,Catherine, AU - Deslouis,Claude, AU - Rocha-Filho,Romeu C, AU - Fatibello-Filho,Orlando, Y1 - 2013/08/15/ PY - 2013/04/20/received PY - 2013/07/22/revised PY - 2013/08/07/accepted PY - 2013/9/21/entrez PY - 2013/9/21/pubmed PY - 2014/4/3/medline KW - Amorphous carbon nitride electrode KW - Anodic pretreatment KW - Boron-doped diamond electrode KW - EIS KW - Square-wave voltammetry KW - XPS SP - 30 EP - 9 JF - Analytica chimica acta JO - Anal Chim Acta VL - 797 N2 - Boron-doped diamond (BDD) films are excellent electrode materials, whose electrochemical activity for some analytes can be tuned by controlling their surface termination, most commonly either to predominantly hydrogen or oxygen. This tuning can be accomplished by e.g. suitable cathodic or anodic electrochemical pretreatments. Recently, it has been shown that amorphous carbon nitride (a-CNx) films may present electrochemical characteristics similar to those of BDD, including the influence of surface termination on their electrochemical activity toward some analytes. In this work, we report for the first time a complete electroanalytical method using an a-CNx electrode. Thus, an a-CNx film deposited on a stainless steel foil by DC magnetron sputtering is proposed as an alternative electrode for the simultaneous determination of dopamine (DA) and ascorbic acid (AA) in synthetic biological samples by square-wave voltammetry. The obtained results are compared with those attained using a BDD electrode. For both electrodes, a same anodic pretreatment in 0.1 mol L(-1) KOH was necessary to attain an adequate and equivalent separation of the DA and AA oxidation potential peaks of about 330 mV. The detection limits obtained for the simultaneous determination of these analytes using the a-CNx electrode were 0.0656 μmol L(-1) for DA and 1.05 μmol L(-1) for AA, whereas with the BDD electrode these values were 0.283 μmol L(-1) and 0.968 μmol L(-1), respectively. Furthermore, the results obtained in the analysis of the analytes in synthetic biological samples were satisfactory, attesting the potential application of the a-CNx electrode in electroanalysis. SN - 1873-4324 UR - https://www.unboundmedicine.com/medline/citation/24050667/Amorphous_carbon_nitride_as_an_alternative_electrode_material_in_electroanalysis:_simultaneous_determination_of_dopamine_and_ascorbic_acid_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0003-2670(13)01082-9 DB - PRIME DP - Unbound Medicine ER -