Farzaneh Marahel; Abdolmohsen Amouri; Alireza Geramizadegan; Mohammad Reza Asghariganjeh
Abstract
In this study, a description of spectrofluorometer method for the measure of epinephrine (EP) drug in urine and blood samples using lead sulfide (PbS) quantum dots via glutathione nanocomposite as a sensor using a resonance Rayleigh scattering (RRS) technique. The sensor was characterized using FTIR, ...
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In this study, a description of spectrofluorometer method for the measure of epinephrine (EP) drug in urine and blood samples using lead sulfide (PbS) quantum dots via glutathione nanocomposite as a sensor using a resonance Rayleigh scattering (RRS) technique. The sensor was characterized using FTIR, XRD, SEM, and TEM. The scattering intensity (∆IRRS) signal was detected by a fluorescence detector at λ(ex) = 325 nm. Under the optimum conditions, the calibration plot is linear in the (EP) drug concentration range of (0.050‒200.0 ng L-1). The standard deviations of (1.2 %), detection limit (LOD) of the method (0.015 ng L-1) and quantification (LOQ) of the method (0.044 ng L-1) in time 50 s, 325 nm for sensor level response PbS QDs-glutathione nanocomposite with (96 %) confidence evaluated. Moreover, a PbS QDs-glutathione nanocomposite sensor with RRS technique for the analysis of (EP) drug in urine and blood samples with high % recoveries (94.0 -99.2 %), low % RSD values (< 3 %) was used. This method offers a reliable approach for detecting various drugs in clinical and pharmaceutical settings.
Mohdokht Arjomand kermani
Abstract
Addressed herein, a two-component transition metal oxide nanocomposite, nickle/cobalt oxide, was synthesized via a hydrothermal method and characterized by X-ray diffraction and scanning electron microscopy. This material was then utilized to modify a pencil graphite electrode. The resulting sensor demonstrated ...
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Addressed herein, a two-component transition metal oxide nanocomposite, nickle/cobalt oxide, was synthesized via a hydrothermal method and characterized by X-ray diffraction and scanning electron microscopy. This material was then utilized to modify a pencil graphite electrode. The resulting sensor demonstrated exceptional performance and stability in detecting trace amounts of an organophosphorus pesticide residues present in several real samples. Using the as-prepared martial hybridized with graphene oxide pencil electrode, a broad linear concentration range(40-480nM) and an extremely low detection limit (21nM) were successfully achieved. Also, the fabricated low-cost sensor showed good reproducibility and stability for analysis of chlorpyrifos.Keywords: Organophosphorus pesticide, Electrocatalyst, Sensor, Pencil electrode
Parisa Jamalipour; Nasrin Choobkar; Maryam Abrishamkar; Elham Pournamdari
Abstract
In this current article, a chemical sensor was synthesized PbS functionalized with Gelatin Quantum Dots for Fenpyroximate. The measure of Fenpyroximate was performed using concentration (2.5×10-3 mol L-1), PbS Quantum Dot-Gelatin nanocomposites sensor, pH 6, and time 40 s, wavelength 328 nm. Under ...
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In this current article, a chemical sensor was synthesized PbS functionalized with Gelatin Quantum Dots for Fenpyroximate. The measure of Fenpyroximate was performed using concentration (2.5×10-3 mol L-1), PbS Quantum Dot-Gelatin nanocomposites sensor, pH 6, and time 40 s, wavelength 328 nm. Under the optimum conditions, the detection limit linear range were obtained (0.02 to 20.0 µg L-1). The standard deviation of less than (2.0%), and detection limits (3S/m) of the method (0.02 µg L-1) for determination of Fenpyroximate, was obtained. The observed outcomes confirmed the suitability recovery and a very low detection limit for measuring the Fenpyroximate. The chemical PbS Quantum Dot–Gelatin nanocomposites sensor as excellent sensor in the practical application of Fenpyroximate related to residue management is in surface water samples.
Amirkhosro Beheshti; Tahereh Rohani; Sayed Zia Mohammadi; Maryam Dadkhodazadeh
Abstract
Molybdenum disulfide as a transition metal dichalcogenide was prepared by a hydrothermal method and hybridized with graphene oxide (MoS2/GO). The as-prepared materials were investigated by Fourier transform infra-red spectroscopy (FT-IR), X-ray diffraction (XRD), energy dispersive X-ray elemental analysis ...
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Molybdenum disulfide as a transition metal dichalcogenide was prepared by a hydrothermal method and hybridized with graphene oxide (MoS2/GO). The as-prepared materials were investigated by Fourier transform infra-red spectroscopy (FT-IR), X-ray diffraction (XRD), energy dispersive X-ray elemental analysis (EDX) techniques as well transmission electron microscopy (TEM) image. The nanomaterial with its electrocatalytic properties was applied as an electro-nanocatalyst for loading on a glassy carbon electrode (MoS2/GO-GCE) for detection of carbamazepine as an anti-epileptic in real body samples. The simple and low-cost developed electrochemical sensor detected carbamazepine with a vast linear concentration range(30-350nM), very low detection limit about 6.0nM and significant sensitivity equal to 0.134µA/nM.
Mohammad Mazloum-Ardakani; Zahra Alizadeh; Laleh Hosseinzadeh; Bibifatemeh Mirjalili; Naeimeh Salehi
Abstract
In this work, we synthesis and application of functionalized carbon nanotubes (CNTs) In this work, we synthesis and application of functionalized carbon nanotubes (CNTs) with6-amino-4-(3,4-dihydroxyphenyl)-3-methyl-1,4-dihydropyrano[2,3-c]pyrazole-5 carbonitrile (pyrazole derivative (APC)) as sensing ...
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In this work, we synthesis and application of functionalized carbon nanotubes (CNTs) In this work, we synthesis and application of functionalized carbon nanotubes (CNTs) with6-amino-4-(3,4-dihydroxyphenyl)-3-methyl-1,4-dihydropyrano[2,3-c]pyrazole-5 carbonitrile (pyrazole derivative (APC)) as sensing platform toward hydrazine (HZ). Electrochemical properties of functionalized carbon nanotubes composite (APC-CNT) were investigated by cyclic voltammetry, chronoamperometry and differential pulse voltammetry techniques. It was found that the APC-CNT composite exhibited a pair of redox peaks, which is due to the electron transfer between the APC and the glassy carbon electrode. The electrocatalytic properties of the APC-CNT composite for HZ oxidation was remarkably increased as compared to only CNTs. The kinetic parameters of the APC-CNT composite in the presence and absence of HZ was studied by electrochemical methods. The APC-CNT modified electrode revealed an excellent voltammetric response to oxidation of HZ with a wide linear range from 0.01 μM to 120.0 µM and limit of detection of 8.6 nM. Also, APC-CNT modified electrode shows high selectivity, good stability, reproducibility with a RSD less than 2.11%.
