Fabrication, characterization and analytical performance of the hydroxylamine sensor based on an oracet blue multi-walled carbon nanotubes film deposited on an electrode surface

Abstract

Neste trabalho, a oxidação eletrocatalítica de hidroxilamina em um eletrodo de carbono vítreo modificado com "oracet blue" e nanotubos de carbono de paredes múltiplas (OBMWCNT-GCE) foi estudada. O potencial de pico de hidroxilamina em superfície OBMWCNT-GCE desloca em cerca de 320 e 335 mV para valores negativos, em comparação com aqueles em superfície MWCNT e superfície GCE ativada. Os parâmetros cinéticos para a oxidação de hidroxilamina na superfície modificada do eletrodo foram determinados por medidas de voltametria cíclica. A detecção amperométrica da hidroxilamina foi realizada em 170 mV em uma solução tampão de fosfato (pH 7,0), resultando em dois intervalos de resposta linear de 4,0-102,4 e 102,4-5820,9 µmol L -1 e limite de detecção de 0,7 µmol L -1 . A resposta amperométrica para a determinação de hidroxilamina provou ser reprodutível, rápida e estável. Finalmente, OBMWCNT-GCE foi aplicado com sucesso à determinação de hidroxilamina em duas amostras de água natural.In this work, the electrocatalytic oxidation of hydroxylamine on a glassy carbon electrode modified with oracet blue and multi-walled carbon nanotubes (OBMWCNT-GCE) has been studied. The peak potential of hydroxylamine at OBMWCNT-GCE surface shifts by about 320 and 335mV toward negative values compared with those at a MWCNT and activated GCE surface. Kinetic parameters for the oxidation of hydroxylamine at the modified electrode surface were determined by cyclic voltammetry measurements. The amperometric detection of hydroxylamine was carried out at 170 mV in a 0.1 mol L -1 phosphate buffer solution (pH 7.0) resulting in two linear response ranges of 4.0-102.4 µmol L -1 and 102.4-5820.9 µmol L -1 and the limit of detection of 0.7 µmol L -1 . The amperometric response for hydroxylamine determination proved to be repeatable, fast and stable. Finally, OBMWCNT-GCE was successfully applied to the hydroxylamine determination in two water natural samples.

Application of Oracet Blue in a novel and sensitive electrochemical biosensor for the detection of microRNA

“…17,18 The chemical structures of the OB and its proposed electroactive reaction are shown in Fig. In Previous reports, Zare and his colleagues developed an OB modified glassy carbon electrode for the simultaneous detection of dopamine, ascorbic acid and uric acid.…”

“…In both cases, OB showed great promise and exhibited a potent and persistent electrocatalytic behaviour for use as an electroactive compound. 17,18 The chemical structures of the OB and its proposed electroactive reaction are shown in Fig. 1.…”

Electrosynthesis and electrochemical characteristics of 2,2′-(4,5-dihydroxy-3-methoxy-1,2-phenylene)bis(3-oxo-3-phenylpropanenitrile): application as a mediator for determination of hydroxylamine at a carbon nanotube modified electrode surface

“…The dynamic range and the detection limit of the recently reported modied electrodes are shown in Table 2. 14,[31][32][33][34][35][36][37][38]47,[49][50][51][52][53][54][55][56][57][58][59][60] As it can Paper be seen, the capabilities of the proposed sensor are superior in most cases than the others. Using the modied electrode, the relative standard deviation (RSD) corresponding to 10 replicate measurements of 100.0 mmol L À1 hydroxylamine was 1.1%.…”

“…30 In electrochemical methods, various mediators have been used for hydroxylamine determination. For example, electrodes modi-ed with mediators of nickel hexacyanoferrate-carbon ceramic, 31 an indenedione derivative, 32 coumestan derivatives, 33 rutin, 34 alizarin red S, 35 ruthenium oxide nanoparticles, 36 chlorogenic acid, 37 and Oracet blue 38 have been earlier used for the determination of hydroxylamine. The modied electrodes have advantages and limitations.…”

Simultaneous Determination of Streptomycin and Oxytetracycline Using a Oracet-Blue/Silver-Nanoparticle/Graphene-Oxide/Modified Screen-Printed Electrode

“…The present work was conducted based on the second peak potential at 540 mV. Based on preparation methods of the OB-modified electrodes reported in the literature [16][17][18], the present work describes the utilization of a oracet blue/silver-nanoparticles/graphen-oxide-modified screen-printed electrode (OB/SNPs/GO/SPE) as an electrocatalyst for the oxidation of STR. Additionally, the successful determination of STR in the presence of OTC in real samples with the prepared modified electrode is described.…”