A new strategy for NADH sensing using ionic liquid crystals-carbon nanotubes/nano-magnetite composite platform

Atta, Nada F.; Gawad, Soha Abdel; El-Ads, Ekram H.; El-Gohary, Asmaa R.M.

doi:10.1016/j.snb.2017.05.026

Cited by 59 publications

(50 citation statements)

References 47 publications

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“…This result showed that (CNTs‐ILC) was a more suitable support for crown compared to CNTs toward the oxidation of ST. This is attributed to the ability of ILC to penetrate through the spacing between CNTs leading to high ionic and electronic conductivities of the corresponding matrix . Moreover, CNTs mixed with ILC containing ionized groups, which have excellent orientation, resulted in a highly efficient dispersion which is 1000 folds compared to the case of absence of ILC.…”

Section: Resultsmentioning

confidence: 99%

“…Ionic liquid crystals (ILCs) have attracted the attention of many scientists worldwide since their behavior pathways could be influenced by tuning the mesophase formation . The use of ionic liquid crystals (ILCs) compared to ILs has attracted much interest due to their high anisotropic ionic conductivity and molecular orientational ordering . ILCs possess the properties of ILs namely high ionic conductivity, chemical and thermal stability and intrinsic catalytic ability and that of liquid crystals .…”

Section: Introductionmentioning

confidence: 99%

“…The use of ionic liquid crystals (ILCs) compared to ILs has attracted much interest due to their high anisotropic ionic conductivity and molecular orientational ordering . ILCs possess the properties of ILs namely high ionic conductivity, chemical and thermal stability and intrinsic catalytic ability and that of liquid crystals . Also, the abundance of negative π‐electrons on CNTs surfaces had a great affinity for the positively charged ILCs .…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Determination of Neurotransmitters at Crown Ether Modified Carbon Nanotube Composite: Application for Sub‐nano‐sensing of Serotonin in Human Serum

2018

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We propose an electrochemical sensor based on applying two successive thin layers from a mixture of multiwalled carbon nanotubes‐ionic liquid crystal and crown ether at glassy carbon electrode surface (GC/(CNTs‐ILC)/Crown). The sensor was used for sensitive determination of neurotransmitters based on effective synergism between its components. The compact conducting surface of (CNTs‐ILC) with large surface area allowed the assembling of stable host‐guest inclusion complexes between crown ethers and neurotransmitters. The GC/(CNTs‐ILC)/Crown exhibited excellent electro‐catalytic activity toward the determination of serotonin (ST) in a wide linear dynamic range: 0.005 μmol L−1 to 100 μmol L−1. In the concentration range 0.005 μmol L−1 to 1 μmol L−1, the detection limit is 2.03×10−10 mol L−1 and quantification limit is 6.78×10−10 mol L−1 with correlation coefficient 0.999. The sensor was successfully applied for ST detection in human serum samples with satisfied recovery results. The sensor showed excellent analytical performance for the determination of ST in terms of low detection limit, good sensitivity and reproducibility. Furthermore excellent anti‐interference ability and simultaneous determination of ST in presence of other compounds as ascorbic acid, dopamine and antidepressant drug were achieved.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical Determination of Neurotransmitters at Crown Ether Modified Carbon Nanotube Composite: Application for Sub‐nano‐sensing of Serotonin in Human Serum

2018

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“…[31][32][33][34] Recently, ionic liquid crystal (ILC) has arisen as an interesting compound in different fields like energy storage systems, solar cells, anisotropic ion-conductive materials, molecular electronics, electrochromic materials, synthesis approaches, universal solvents, anisotropic photo-luminescent soft materials, catalysis and sensors. [35][36][37][38][39][40][41][42] ILC, integrated image of ionic liquid and liquid crystal, comprises of oppositely Scheme 1. Chemical structures of (A) L-dopa, and (B) carbidopa.…”

Section: Introductionmentioning

confidence: 99%

“…[35][36][37][38] Atta et al have proved the electrocatalytic activity of ILC modified CPE or GCE towards determination of some electroactive species of biological interest and catalytic conversion of methanol. [39][40][41][42] Therefore, the combination of ILC and gold nanoclusters with their unique characteristics as modifiers for CPE is expected to offer enhanced electrochemical response towards the studied compounds.…”

Section: Introductionmentioning

confidence: 99%

Efficient Electrochemical Sensor Based on Gold Nanoclusters/Carbon Ionic Liquid Crystal for Sensitive Determination of Neurotransmitters and Anti-Parkinson Drugs

et al. 2019

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Purpose: Herein we introduce a simple and sensitive sensor for the electrochemical determination of neurotransmitters compounds and anti-Parkinson drugs. Methods: The electrochemical sensor (Au/CILCE) based on gold nanoclusters modified carbon ionic liquid crystal (ILC) electrode was characterized using scanning electron microscopy and voltammetry measurements. Results: The effect of ionic liquid type in the carbon paste composite for the electro-catalytic oxidation of L-dopa was evaluated. Highest current response was obtained in case of ILC compared to other studied kinds of ionic liquids. The effective combination of gold nanoclusters and ILC resulted in extra advantages including large surface area and high ionic conductivity of the nanocomposite. L-dopa is considered one of the most important prescribed medicines for treating Parkinson’s disease. Moreover, a binary therapy using L-dopa and carbidopa proved effective and promising as it avoids the short comings of L-dopa mono-therapy for Parkinson’s patients. The Au/CILCE can detect L-dopa in human serum in the linear concentration range of 0.1 μM to 90 μM with detection and quantification limits of 4.5 nM and 15.0 nM, respectively. Also, the Au/CILCE sensor can simultaneously and sensitively detect L-dopa in the presence of carbidopa with low detection limits. Conclusion: The sensor is advantageous to be applicable for electrochemical sensing of other biologically electroactive species.

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Electrocatalytic NADH Sensing using Electrodes Modified with 2‐[2‐(4‐Nitrophenoxy)ethoxy]ethylthio‐Substituted Porphyrazine/Single‐Walled Carbon Nanotube Hybrids

et al. 2020

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The electrochemical properties of a modified electrode covered with 2‐[2‐(4‐nitrophenoxy)ethoxy]ethylthio‐substituted porphyrazine/single‐walled carbon nanotube hybrids were investigated. The electrochemical study revealed that the electrode mechanism is more complex in acidic conditions in comparison to neutral buffer. According to our study, the nitro groups constituting the part of porphyrazine substituents can be electrochemically reduced to the corresponding hydroxylamine moieties; surprisingly, however, the latter can be additionally transformed to o‐aminophenol/o‐iminoquinone groups, but only in acidic conditions. The electrode covered with hybrid material was used in the electrocatalytic oxidation of NADH. According to these results, it seems that after the electrochemical activation of the electrode material, 2‐[2‐(4‐nitrophenoxy)ethoxy]ethylthio‐substituted porphyrazine reveals strong electrocatalytic behavior towards NADH oxidation, owing to the appearance of reversible surface‐anchored o‐aminophenol/o‐iminoquinone intermediate redox couples. In the amperometric determination, the limit of detection (LOD) and limit of quantification (LOQ) of NADH were calculated and found to be LOD=0.16 and LOQ=0.48 μM. Moreover, the relative standard deviation of the response was 3.32 %, indicating excellent reproducibility. Thus, the novel electrode based on 2‐[2‐(4‐nitrophenoxy)ethoxy]ethylthio‐substituted porphyrazine and single‐walled carbon nanotubes present an interesting opportunity in the fields of electroanalytical and biosensing applications, and can be considered for amperometric NADH determination.

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A new strategy for NADH sensing using ionic liquid crystals-carbon nanotubes/nano-magnetite composite platform

Cited by 59 publications

References 47 publications

Electrochemical Determination of Neurotransmitters at Crown Ether Modified Carbon Nanotube Composite: Application for Sub‐nano‐sensing of Serotonin in Human Serum

Electrochemical Determination of Neurotransmitters at Crown Ether Modified Carbon Nanotube Composite: Application for Sub‐nano‐sensing of Serotonin in Human Serum

Efficient Electrochemical Sensor Based on Gold Nanoclusters/Carbon Ionic Liquid Crystal for Sensitive Determination of Neurotransmitters and Anti-Parkinson Drugs

Electrocatalytic NADH Sensing using Electrodes Modified with 2‐[2‐(4‐Nitrophenoxy)ethoxy]ethylthio‐Substituted Porphyrazine/Single‐Walled Carbon Nanotube Hybrids

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