Neutral red interlinked gold nanoparticles/multiwalled carbon nanotubes modified electrochemical sensor for simultaneous speciation and detection of chromium (VI) and vanadium (V) in water samples

Filik, Hayati; Avan, Asiye Aslıhan

doi:10.1016/j.microc.2020.105242

Cited by 16 publications

(8 citation statements)

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“…In microbial electrochemistry, the mediator serves as a bridge that transports electrons from a microbial cell to the electrode surface. The commonly used mediators involve two categories: hydrophilic mediators (such as K 3 Fe(CN) 6 and K 4 Fe(CN) 6 ) , and lipophilic mediators (such as ferrocene methanol, menadione, and benzoquinone). − Due to the different solubilities of the mediators and microbial cell structures, their electron-transfer process also differs. As depicted in Scheme , for S.…”

Section: Resultsmentioning

confidence: 99%

Three-Mediator Enhanced Collisions on an Ultramicroelectrode for Selective Identification of Single Saccharomyces cerevisiae

et al. 2022

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Selective detection of colliding entities, especially cells and microbes, is of great challenge in single-entity electrochemistry. Herein, based on the different cellular electron transport pathways between microbes and mediators, we report a three-mediator system [K 3 Fe(CN) 6 , K 4 Fe(CN) 6 , and menadione] to achieve redox activity analysis and selective identification of single Saccharomyces cerevisiae without the usage of antibodies. K 4 Fe(CN) 6 in the three-mediator system will oxidize near the electrode surface and increase the local concentration of K 3 Fe(CN) 6 , which will promote the redox reaction of S. cerevisiae. The hydrophobic mediator�menadione�can selectively penetrate through the S. cerevisiae membrane and get access to its intracellular redox center and can further react with K 3 Fe(CN) 6 in the bulk solution. In contrast, the mediator can only get access to the bacterial membranes of Escherichia coli and Staphylococcus aureus, which results in different electrochemical collision signals between the above microbes. In the three-mediator system, upward step-like collision signals were observed in S. cerevisiae suspension, which are related to their microbial redox activity. In comparison, E. coli or S. aureus only generated downward current steps because the blockage effect of mediator diffusion suppresses their redox activities. When S. cerevisiae co-existed with E. coli or S. aureus, transients generated by both blockage and redox activity were observed. The approach enables us to trace the collision behaviors of different microbes and distinguish their simultaneous collisions, which is the foundation for further application of electrochemical collision technique in the specific identification of single biological entities.

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Section: Resultsmentioning

confidence: 99%

Three-Mediator Enhanced Collisions on an Ultramicroelectrode for Selective Identification of Single Saccharomyces cerevisiae

et al. 2022

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“…13B) which is comparable with other reports. [72][73][74] The selectivity of the chemically modied electrode was tested with various referencing systems like copper, ferrous, nitrite, zinc, sulfate, calcium, nitrate and cadmium as in Fig. 13C, but there were no specic current signals noticed highlighting the specicity of the GCE/Nf-MWCNT@HQ for the Cr(VI) sensing.…”

Section: Discussionmentioning

confidence: 99%

In situ electro-organic synthesis of hydroquinone using anisole on MWCNT/Nafion modified electrode surface and its heterogeneous electrocatalytic reduction of toxic Cr(vi) species

2021

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“…However, since the MWCNT and gold nanoparticles were simply mixed together, there is a limitation in the interaction between the two nanomaterials. Filik et al proposed another MWCNT/gold nanoparticle use for the detection of heavy chromium (Cr) and vanadium (V) ions (Figure 10b) [107]. Here, the authors used neutral red as a cross-linking material between the carbon structure and the gold nanoparticles.…”

Section: Linear Sweep Voltammetrymentioning

confidence: 99%

Carbon-Based Materials and Their Applications in Sensing by Electrochemical Voltammetry

Nguyen

Lee

2023

Inorganics

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In recent years, society has paid great attention to health care and environmental safety. Thus, research on advanced sensors for detecting substances that can harm health and the environment has been developed rapidly. Another popular target for detection techniques is disease-expressing materials that can be collected from body fluids. Carbon, which has outstanding electrochemical properties, can come from a variety of sources and has many morphological shapes, is nevertheless an environmentally friendly material. While carbon nanomaterial has become one of the most common targets for high-tech development, electrochemical voltammetry has proven to be an effective measurement method. Herein, the paper proposes a currently developed carbon nanomaterial along with research on a modified carbon material. Moreover, four common voltammetry methods and related works are also introduced.

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Neutral red interlinked gold nanoparticles/multiwalled carbon nanotubes modified electrochemical sensor for simultaneous speciation and detection of chromium (VI) and vanadium (V) in water samples

Cited by 16 publications

References 50 publications

Three-Mediator Enhanced Collisions on an Ultramicroelectrode for Selective Identification of Single Saccharomyces cerevisiae

Three-Mediator Enhanced Collisions on an Ultramicroelectrode for Selective Identification of Single Saccharomyces cerevisiae

In situ electro-organic synthesis of hydroquinone using anisole on MWCNT/Nafion modified electrode surface and its heterogeneous electrocatalytic reduction of toxic Cr(vi) species

Carbon-Based Materials and Their Applications in Sensing by Electrochemical Voltammetry

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