Electro-deposited nano-webbed structures based on polyaniline/multi walled carbon nanotubes for enzymatic detection of organophosphates

Nagabooshanam, Shalini; John, Alishba T.; Wadhwa, Shikha; Mathur, Ashish; Krishnamurthy, S.; Bharadwaj, Lalit M.

doi:10.1016/j.foodchem.2020.126784

Cited by 47 publications

(11 citation statements)

References 38 publications

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“…26 The major advantage of the electropolymerization method is that it allows direct transfer of transduction elements onto the conductive surface without the need for further adhering agents. 27 The various conventional applications of MIPs are solventphase extraction, membrane catalysis, molecular sensing probe for various analyte detection, drug delivery, protein crystallization, and cell adhesion. 28 Recently, the focus on MIPs in the field of sensors has increased dramatically owing to their high affinity, stability, selectivity, and low fabrication cost.…”

Section: ■ Introductionmentioning

confidence: 99%

Microfluidic Affinity Sensor Based on a Molecularly Imprinted Polymer for Ultrasensitive Detection of Chlorpyrifos

et al. 2020

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The persistent use of pesticides in the agriculture field remains a serious issue related to public health. In the present work, molecularly imprinted polymer thin films were developed using electropolymerization of pyrrole (py) onto gold microelectrodes followed by electrodeposition for the selective detection of chlorpyrifos (CPF). The molecularly imprinted polymer (MIP) was synthesized by the electrochemical deposition method, which allowed in-line transfer of MIP on gold microelectrodes without using any additional adhering agents. Various parameters such as pH, monomer ratio, scan rate, and deposition cycle were optimized for sensor fabrication. The sensor was characterized at every stage of fabrication using various spectroscopic, microscopic, and electrochemical techniques. The sensor requires only 2 μL of the analyte and its linear detection range was found to be 1 μM to 1 fM. The developed sensor’s limit of detection (LOD) and limit of quantification (LOQ) were found to be 0.93 and 2.82 fM, respectively, with a sensitivity of 3.98 (μA/(μM)/ mm2. The sensor’s shelf life was tested for 70 days. The applicability of the sensor in detecting CPF in fruit and vegetable samples was also assessed out with recovery % between 91 and 97% (RSD < 5%). The developed sensor possesses a huge commercial potential for on-field monitoring of pesticides.

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Section: ■ Introductionmentioning

confidence: 99%

Microfluidic Affinity Sensor Based on a Molecularly Imprinted Polymer for Ultrasensitive Detection of Chlorpyrifos

et al. 2020

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“…Upon HCH uptake, the intensities of bands and the I D / I G ratio increased substantially, inferring a more defective structure and a greater degree of disorder in carbon nanotube structures. This fact proves the adhesion of HCH molecules on the surface of MWCNTs-NH 2 . , In addition, no significant shifts of bands were observed in the adsorption of MWCNTs-NH 2 to HCH, which implies that electronegativity changes linked to strong interactions such as chemical interaction had not largely occurred during adsorption. , The uptake of HCH on MWCNTs-NH 2 can be further manifested by TEM-EDX elemental mapping analysis, as shown in Figure . As expected, C and Cl elements are uniformly distributed in the framework, giving good support to the HCH uptake on MWCNTs-NH 2 .…”

Section: Resultsmentioning

confidence: 73%

“…51,52 In addition, no significant shifts of bands were observed in the adsorption of MWCNTs-NH 2 to HCH, which implies that electronegativity changes linked to strong interactions such as chemical interaction had not largely occurred during adsorption. 53,54 The uptake of HCH on MWCNTs-NH 2 can be further manifested by TEM-EDX elemental mapping analysis, as shown in Figure 8. As expected, C and Cl elements are uniformly distributed in the framework, giving good support to the HCH uptake on MWCNTs-NH 2 .…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Exceedingly Rapid Enrichment of Organochlorine Pollutants in Complex Samples Using Amino-Functionalized Carbon Nanotubes

et al. 2021

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Organochlorine pesticides have made a large contribution to the development of modern agriculture but also caused contamination in the environment, and they persistently cause harm to humans and organisms due to their stability in nature. Precise tracking and enrichment of these pollutions are therefore clearly required. In this work, we explored an amino-functionalized multiwalled carbon nanotube (MWCNT-NH2) to selectively trap and rapidly enrich trace organochlorine contaminants from aqueous solutions. Through a case study of trace hexachlorocyclohexane (HCH) enrichment, it is demonstrated that an MWCNT-NH2 exhibits ultrafast capture kinetics (96.5% removed in 30 s), where a high uptake rate (98.5%), an outstanding uptake capacity (197.9 mg g–1), and an excellent selectivity in complex samples are obtained, and a high uptake efficiency is maintained over a wide range of harsh conditions (pH 2–10). This capturer can be further conveniently separated by a simple filtration. Importantly, an MWCNT-NH2 can be applied to efficiently enrich HCH in samples with much low temperatures (≤4 °C). This study introduces a new avenue for enrichment and separation of trace organic contaminants and also holds promise for developing highly efficient sensors, detectors, and scavengers of harmful compounds.

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“…For the past few decades electrochemical bio-sensors have drawn more attention because it offers sensitive detection platform with low detection limits and reduced sample volume and response time [13]- [17]. Among the various electrochemical detection techniques Electrochemical Impedance Spectroscopy (EIS) has been widely used for biochemical sensing applications.…”

Section: Introductionmentioning

confidence: 99%

Development of Field Deployable Sensor for Detection of Pesticide From Food Chain

et al. 2021

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The use of pesticides in agriculture field remains a serious issue related to public health. This necessitates the need to develop a low cost/portable, sensitive and selective bio-sensing platform for detection of pesticides in food chain. In this work a low-cost biosensing platform for ultrasensitive detection of chlorpyrifos (CPF) is developed. Electrochemical micro Paper Analytical Device (EµPAD) is fabricated by conventional screenprinting technology. Metal Organic Framework (Z1200 MOF) having zinc metal and imidazole ligand is used as a transducing element which facilitates biocompatible matrix for Acetylcholinesterase (AChE) enzyme immobilization. The limit of detection for CPF is found be 3 ng/L with sensitivity 0.521 kΩ/ng L -1 /mm 2 . The sensor required 100µL of reagent and was tested with a linear concentration range of 10 ng/L to 1000 ng/L with response time of 5s. The sensor is further integrated with portable electronics based on Arduino microcontroller and Artificial Intelligence (AI) which provided economical, portable and user-friendly sensing platform. The stability of the sensor was 30 days. The developed sensor was also tested with real samples and the sensor response is in agreement with conventional technique.

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Electro-deposited nano-webbed structures based on polyaniline/multi walled carbon nanotubes for enzymatic detection of organophosphates

Abstract: The Open University's repository of research publications and other research outputs Electro-deposited nano-webbed structures based on polyaniline/multi walled carbon nanotubes for enzymatic detection of organophosphates

Cited by 47 publications

References 38 publications

Microfluidic Affinity Sensor Based on a Molecularly Imprinted Polymer for Ultrasensitive Detection of Chlorpyrifos

Microfluidic Affinity Sensor Based on a Molecularly Imprinted Polymer for Ultrasensitive Detection of Chlorpyrifos

Exceedingly Rapid Enrichment of Organochlorine Pollutants in Complex Samples Using Amino-Functionalized Carbon Nanotubes

Development of Field Deployable Sensor for Detection of Pesticide From Food Chain

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