Simultaneous detection of ten kinds of insecticide residues in honey and pollen using UPLC-MS/MS with graphene and carbon nanotubes as adsorption and purification materials

2021 ◽  
Author(s):  
Xiuyu Pang ◽  
Chenyu Li ◽  
Chuanjiang Zang ◽  
Lei Guan ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Simultaneous Detection ◽  
Insecticide Residues ◽  
As Adsorption

Multiwalled Carbon Nanotubes Covered with Cobalt (II) Phthalocyanine by In Situ Synthesis and its Electrochemical Sensing Performance towards DA and UA

2014 ◽  
Vol 809-810 ◽  
pp. 43-52
Author(s):  
Hua Hua Wang ◽  
Nan Li ◽  
Kai Li ◽  
Yuan Bu ◽  
Wen Le Dai ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Simultaneous Detection ◽  
Thick Layer ◽  
Electrochemical Sensing ◽  
Multiwalled Carbon ◽  
X Ray ◽  
Platinum Particles

Multiwalled carbon nanotubes (MWCNTs) as an excellent supporter covered with a thick layer of cobalt phthalocyanine (CoPc) were prepared by in-situ synthesis. Platinum particles were adopted to enhance the conductivity of CoPc-MWCNTs. The final nanocomposite Pt-CoPc-MWCNTs was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Strong aromatic π-π stacking between MWCNTs and CoPc made CoPc in-situ forming on MWCNTs. With homogeneous thickness of CoPc covered on the MWCNTs and Pt particles equally distributed, the nanocomposite was used as electrocatalyst. The electrochemical properties of the composite got researched by casting the dispersion of Pt-CoPc-MWCNTs on the glassy carbon electrode. Compared with other modified electrodes, Pt-CoPc-MWCNTs/GC electrode exhibited excellent electrochemical activity towards dopamine (DA) and uric acid (UA). Linear responses for DA and UA were obtained in the ranges of 5 to 170 μM and 5 to 100 μM, and limits of detection were 2.6 and 1.4 μM (S/N= 3), respectively. Simultaneous detection of DA and UA in the presence of ascorbic acid (AA) also displayed selective property, with no interference to each other.

scholarly journals Simultaneous electrochemical detection of levodapa, paracetamol and l-tyrosine based on multi-walled carbon nanotubes

RSC Advances ◽  
2020 ◽  
Vol 10 (24) ◽  
pp. 14218-14224 ◽  
Author(s):  
Zai-Yu Li ◽  
Dan-Yang Gao ◽  
Zhi-Yong Wu ◽  
Shuang Zhao
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Sensor ◽  
Electrochemical Detection ◽  
Simultaneous Detection ◽  
Linear Range ◽  
Good Reproducibility ◽  
Wide Linear Range ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

A novel electrochemical sensor for the simultaneous detection of levodopa, paracetamol and l-tyrosine was developed based on multi-walled carbon nanotubes. The sensor has the merits of wide linear range, good selectivity and good reproducibility.

Metal-decorated carbon nanotubes-based sensor array for simultaneous detection of toxic gases

2020 ◽  
pp. 104534
Author(s):  
Icell Sharafeldin ◽  
Sara Garcia-Rios ◽  
Nashaat Ahmed ◽  
Miriam Alvarado ◽  
Xavier Vilanova ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Sensor Array ◽  
Simultaneous Detection ◽  
Toxic Gases

Mesoporous Pd@Pt core–shell nanoparticles supported on multi-walled carbon nanotubes as a sensing platform: application in simultaneous electrochemical detection of anticancer drugs doxorubicin and dasatinib

2019 ◽  
Vol 11 (4) ◽  
pp. 443-453 ◽  
Author(s):  
Pramod K. Kalambate ◽  
Yankai Li ◽  
Yue Shen ◽  
Yunhui Huang
Keyword(s):  
Carbon Nanotubes ◽  
Anticancer Drugs ◽  
Electrochemical Detection ◽  
Simultaneous Detection ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Sensing Platform ◽  
Multi Walled Carbon Nanotubes ◽  
Core Shell Nanoparticles ◽  
Walled Carbon Nanotubes

A novel electrochemical sensor based on Pd@Pt/MWCNT composite for simultaneous detection of doxorubicin and dasatinib.

scholarly journals Simultaneous Detection of Dihydroxybenzene Isomers Using Electrochemically Reduced Graphene Oxide-Carboxylated Carbon Nanotubes/Gold Nanoparticles Nanocomposite

Biosensors ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 321
Author(s):  
Angélica Domínguez-Aragón ◽  
Rocio B. Dominguez ◽  
Erasto Armando Zaragoza-Contreras
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Tap Water ◽  
Simultaneous Detection ◽  
3D Network ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide ◽  
Carboxylated Carbon Nanotubes

An electrochemical sensor based on electrochemically reduced graphene oxide (ErGO), carboxylated carbon nanotubes (cMWCNT), and gold nanoparticles (AuNPs) (GCE/ErGO-cMWCNT/AuNPs) was developed for the simultaneous detection of dihidroxybenzen isomers (DHB) hydroquinone (HQ), catechol (CC), and resorcinol (RS) using differential pulse voltammetry (DPV). The fabrication and optimization of the system were evaluated with Raman Spectroscopy, SEM, cyclic voltammetry, and DPV. Under optimized conditions, the GCE/ErGO-cMWCNT/AuNPs sensor exhibited a linear concentration range of 1.2–170 μM for HQ and CC, and 2.4–400 μM for RS with a detection limit of 0.39 μM, 0.54 μM, and 0.61 μM, respectively. When evaluated in tap water and skin-lightening cream, DHB multianalyte detection showed an average recovery rate of 107.11% and 102.56%, respectively. The performance was attributed to the synergistic effects of the 3D network formed by the strong π–π stacking interaction between ErGO and cMWCNT, combined with the active catalytic sites of AuNPs. Additionally, the cMWCNT provided improved electrocatalytic properties associated with the carboxyl groups that facilitate the adsorption of the DHB and the greater amount of active edge planes. The proposed GCE/ErGO-cMWCNT/AuNPs sensor showed a great potential for the simultaneous, precise, and easy-to-handle detection of DHB in complex samples with high sensitivity.

Simultaneous detection of Dopamine and Serotonin in real complex matrices

2020 ◽  
Vol 16 ◽  
Author(s):  
Florina Truţă ◽  
Mihaela Tertisa ◽  
Cecilia Cristea ◽  
Florin Graur
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Simultaneous Detection ◽  
Multiwall Carbon Nanotubes ◽  
Differential Pulse ◽  
Sensitive Detection ◽  
Complex Matrices ◽  
Simple Method ◽  
Starting Point ◽  
Highly Sensitive Detection

Background: Neurotransmitters are chemical messengers with crucial implication in human body. Perturbations in concentration of neurotransmitters can affect a multitude of mental and physical functions, such as heart rate, sleep, appetite and mood. Thus, the sensitive detection of these compounds is a real need for a new generation of treatments. Method: Two important neurotransmitters namely dopamine and serotonin were investigated in this study for simultaneous detection using differential pulse voltammetry. The optimization of several surface parameters were performed in order to choose the best electrode material for electrochemical oxidation of targets. Screen printed electrodes based on carbon, gold and platinum and modified with different nanomaterials (carbon nanotubes, gold nanoparticles and carbon nanotubes decorated with gold nanoparticles) were tested. Results: Carbon-based electrodes modified with multiwall carbon nanotubes and gold nanoparticles were chosen after the optimization protocol. Linear correlations between the analytic signals obtained and the concentration of dopamine and serotonin respectively were obtained with good sensitivity and the detection limits were 0.3 µM for dopamine and 0.8 µM for serotonin with no significant reciprocal influences. Selectivity studies were also performed, as well as tests in real samples (e.g. human serum, tears and saliva) complex matrices for which acceptable recoveries were obtained. Conclusion: The results obtained within this study can be considered as an important starting point for the development of a fast and simple method for selective and highly sensitive detection of neurotransmitters, with possible applications in the diagnosis of different pathologies and for monitoring the effectiveness of the applied drug treatment.

Analysis of Capillary Condensation of Vapor in Multi-Wall Carbon Nanotubes

2011 ◽  
Vol 483 ◽  
pp. 694-698
Author(s):  
Wei Wang ◽  
Xin Wang ◽  
Tuo Li ◽  
Wei Ping Chen
Keyword(s):  
Carbon Nanotubes ◽  
Relative Humidity ◽  
Humidity Sensor ◽  
Quartz Crystal ◽  
Capillary Condensation ◽  
Equivalent Model ◽  
Sensing Element ◽  
Multi Wall Carbon Nanotubes ◽  
As Adsorption ◽  
Humidity Environment

Multi-wall Carbon Nanotubes (MWNTs) is the new hotspot material as the active sensing element, but there is no certain theory on the phenomenon of the vapor's capillary condensation in MWNTs for the present. This paper presents a new theory that the capillary condensation of vapor in MWNTs mostly occur in the internal hollow tube, according to the calculation of equivalent model of MWNTs. A kind of carbon nanotubes (CNTs) humidity sensor based on quartz crystal microbalance was fabricated, CNTs employed as adsorption materials. The sensor was put in 11% and 97% relative humidity environment in experimental, and the value of MH2O/MCNT was calculated. The theory in this paper is proved by the comparison between the experimental and the analysis results.

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