Flow-injection electrochemical determination of citric acid using a cobalt(II)–phthalocyanine modified carbon paste electrode

Nascimento, Raphael Fonseca do; Selva, Thiago Matheus Guimarães; Ribeiro, Williame F.; Belian, Mônica F.; Angnes, Lúcio; Nascimento, Valberes B.

doi:10.1016/j.talanta.2012.10.055

Cited by 41 publications

(14 citation statements)

References 36 publications

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“…30 reported a similar limit of detection of 0.20 mM using CoPC‐SPEs, whilst Nascimento et al. 34 showed a slightly improved limit of detection of 0.11 mM with the incorporation of the CoPC within a carbon paste electrode. We note that within Nascimento et al.…”

Section: Resultsmentioning

confidence: 93%

Ultraflexible Screen‐Printed Graphitic Electroanalytical Sensing Platforms

et al. 2014

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The pursuit of ultraflexible sensors has arisen from the recent implementation of electrochemical sensors into wearable clothing where extensive mechanical stress upon the sensing platform is likely to occur. Such scenarios have witnessed screen‐printed electrodes being incorporated into the waistband of undergarments for the determination of key analytes while others have reported incorporation into a neoprene wetsuit. In these conformations, the substrates which the sensors are printed upon need to be ultraflexible and capable of withstanding extensive individual mechanical stress. Therefore the composition, thickness and its combination of screen‐printed ink require extensive consideration. A common short‐coming within the field of screen‐printed derived sensors is the lack of consideration towards the substrate material employed, and is rather in favour of the development of new electrode geometries and screen‐printing inks. In this paper we explore the screen‐printing of graphite based electroanalytical sensing platforms onto graphic paper commonly used in house‐hold printers, and for the first time both tracing paper and ultraflexible polyester‐based substrates are used. These sensors are electrochemically benchmarked with the redox probes hexaammine‐ruthenium(III) chloride and potassium ferrocyanide(II). The effect of mechanical contortion upon two types of electrode substrates is also performed where it was found that these ultraflexible based polyester‐based electrodes are superior to the previously reported ultraflexible paper electrodes since they can withstand extensive mechanical contortion, yet they still give rise to useful electrochemical performances. Most importantly the ultraflexible polyester electrodes do not suffer from capillary action as observed in the case of paper‐based sensors causing the solution to wick‐up the electrode towards the electrical connections resulting in electrical shorting, therefore compromising the electrochemical measurement; as such this new substrate can be used as a replacement for paper‐based substrates and yet still be resilient to extreme mechanical contortion. A new configuration is also explored using these electrode substrate supports where the working carbon electrode contains the electrocatalyst, cobalt(II) phthalocyanine (CoPC), and is benchmarked towards the electroanalytical sensing of the model analytes citric acid and hydrazine which demonstrate excellent sensing capabilities in comparison to previously reported screen‐printed electrodes.

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Section: Resultsmentioning

confidence: 93%

Ultraflexible Screen‐Printed Graphitic Electroanalytical Sensing Platforms

et al. 2014

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“…The results obtained with the proposed FIA method compared well with a standard HPLC method. It was also shown that the electrocatalytic activity of cobalt(II)-phthalocyanine immobilized in a carbon paste electrode for citric acid oxidation under a diffusion-controlled electrochemical process was employed to develop a selective flow injection amperometric analysis system [114].…”

Section: Modified Carbon-paste Electrodesmentioning

confidence: 99%

Application of phthalocyanines in flow- and sequential-injection analysis and microfluidics systems: A review

Staden

2015

Talanta

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“…Metallophthalocyanines are macrocyclic 18π electron conjugated molecules extensively studied in electrochemistry, because of their interesting redox properties [18]. Cobalt phthalocyanine (CoPc) is an electron mediator with a low oxidation potential of important organic species [19], that can act as an electron mediator for several molecules, and active catalysts in various reactions of fast mode and with little energy expenditure [20]. Electrocatalytic surface can be assembled on electrode surface using carbon nanomateriais allowing a low working potential that reduces the possibility of interfering species in responses [21].…”

Section: Introductionmentioning

confidence: 99%

A Novel Redox‐free Immunosensor Concept Based on Cobalt Phthalocyanine@carbon Nanotubes Pseudocapacitor for Cardiac B‐type Natriuretic Peptide Detection

et al. 2021

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B‐type natriuretic peptide (BNP) is a selective biomarker for cardiac diagnosis and prognosis of patients with cardiac insufficiency or heart failure, which means the pump function of cardiac muscle is reduced. A pseudocapacitive immunosensor was developed based on faradaic currents generated by a reduction‐reaction with a metallocyanine modified‐carbon nanotube surface. This technique is based on changes in interface by antigen‐antibody interactions, which perturbs the dependent‐diffusion potential reducing the charge transfers proportionally to the BNP captured. This new concept allows new perspectives for point‐of‐care tests since it is simpler and faster to manage with direct measurements of samples than conventional immunosensors.

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Flow-injection electrochemical determination of citric acid using a cobalt(II)–phthalocyanine modified carbon paste electrode

Cited by 41 publications

References 36 publications

Ultraflexible Screen‐Printed Graphitic Electroanalytical Sensing Platforms

Ultraflexible Screen‐Printed Graphitic Electroanalytical Sensing Platforms

Application of phthalocyanines in flow- and sequential-injection analysis and microfluidics systems: A review

A Novel Redox‐free Immunosensor Concept Based on Cobalt Phthalocyanine@carbon Nanotubes Pseudocapacitor for Cardiac B‐type Natriuretic Peptide Detection

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