Portable Benzo[a]pyrene Immunosensor Based on the Polyanline Nanofiber Modified Screen-Printed Electrode

2011 ◽  
Vol 221 ◽  
pp. 295-301
Author(s):  
Chun Ping Wang ◽  
Jie Dan Zhou ◽  
Yi Bin Huang ◽  
Gen Quan Liang ◽  
Ying Ju Liu ◽  
...  
Keyword(s):  
Modified Electrode ◽  
Electrode Surface ◽  
Rapid Detection ◽  
The Self ◽  
Primary Antibody ◽  
Secondary Antibody ◽  
Screen Printed Electrode ◽  
Polyaniline Nanofiber ◽  
Screen Printed

In this work, polyaniline nanofiber was synthesized. Then, polyaniline nanofiber and chitosan were dropped onto the surface of the self-prepared screen-printed electrode (SPE), respectively. After aminopyrene-BSA conjugate was immobilized on the modified electrode surface with the aid of EDC/NHS solution, the primary antibody was dropped on the modified SPE and followed by the HRP-labeled secondary antibody, thus a disposable immunosensor was developed for the rapid detection of benzo[a]pyrene based on an indirect immunoassay.

Effect of APTES Percentage towards Reduced Graphene Oxide Screen Printed Electrode Surface for Biosensor Application

2019 ◽  
Vol 19 ◽  
pp. 1183-1188
Author(s):  
Suhaili Sabdin ◽  
Mohd Azraie Mohd Azmi ◽  
Nurul Azurin Badruzaman ◽  
Fatihatul Zuriati Makmon ◽  
Azman Abd Aziz ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrode Surface ◽  
Screen Printed Electrode ◽  
Reduced Graphene ◽  
Biosensor Application ◽  
Screen Printed

scholarly journals A novel dopamine electrochemical sensor based on La3+/ZnO nanoflower modified graphite screen printed electrode

2019 ◽  
Vol 9 (3) ◽  
pp. 187-195 ◽  
Author(s):  
Somayeh Tajik ◽  
Hadi Beitollahi ◽  
Mohammad Reza Aflatoonian
Keyword(s):  
Modified Electrode ◽  
Phosphate Buffer Solution ◽  
High Sensitivity ◽  
Differential Pulse ◽  
Electrochemical Determination ◽  
Screen Printed Electrode ◽  
Buffer Solution ◽  
Optimized Conditions ◽  
Screen Printed

Flower-like La3+/ZnO nanocomposite was facile synthesized. A simple and ultrasensitive sensor based on graphite screen printed electrode (SPE) modified by La3+/ZnO nanoflower was developed for the electrochemical determination of dopamine. The electrochemical behavior of dopamine was studied in 0.1 M phosphate buffer solution (PBS) using cyclic voltammetry (CV), chronoamperometry (CA) and differential pulse voltammetry (DPV). Compared with the unmodified graphite screen printed electrode, the modified electrode facilitates the electron transfer of dopamine, since it notably increases the oxidation peak current of dopamine. Also, according to CV results the maximum oxidation of dopamine on La3+/ZnO/SPE occurs at 150 mV which is about 140 mV more negative compared with unmodified SPE. Under optimized conditions, the modified electrode exhibited a linear response over the concentration range from 0.15 to 300.0 μM, with a detection limit of 0.08 μM (S/N = 3). The proposed sensor exhibited a high sensitivity, good stability and was successfully applied for dopamine determination in dopamine ampoule, with high recovery.

Voltammetric Determination of Diazepam on Antimony Film Screen-Printed Electrode in Pharmaceutical Formulations

2020 ◽  
Vol 16 ◽  
Author(s):  
Vesna Antunović ◽  
Rada Baošić ◽  
Aleksandar Lolić
Keyword(s):  
Modified Electrode ◽  
Limit Of Detection ◽  
Pharmaceutical Preparations ◽  
Ex Situ ◽  
Screen Printed Electrode ◽  
Limit Of Quantification ◽  
Azomethine Group ◽  
Antimony Film ◽  
Screen Printed

Background: Diazepam belongs to the group of 1,4-benzodiapines. It is used for the treatment of anxiety, convulsions and as a muscle relaxant. The presence of 4,5-azomethine group enables its electrochemical detection Introduction: A screen-printed electrode modified with antimony film was used for the determination of diazepam in pharmaceutical preparations Methods: Electrode modification was done by ex-situ deposition of antimony on commercially available screen-printed electrode. Parameters affecting the electroanalytical response of the sensor, such as deposition potential, deposition time, and antimony concentration, were examined and optimized. The modified electrode showed enhanced electroactivity for diazepam reduction compared to unmodified electrode. Under optimal conditions, linear sweep voltammetry was used for the determination of analyte Results: The sensor showed linear dependence in the range from 0.5 to 10 μmol/L, the correlation coefficient was 0.9992. The limit of detection was 0.33 μmol/L, corresponding limit of quantification was 1.08 μmol/L. Modification enabled determination of diazepam in the presence of oxygen. Conclusion: The modified electrode was used for the determination of diazepam in tablets. Results confirmed the applicability of the electrochemical sensor

Single Oil Drop Electrochemistry on a Screen-Printed Electrode Surface

2014 ◽  
Vol 26 (8) ◽  
pp. 1660-1663 ◽  
Author(s):  
Etienne S. Oliveira ◽  
Pablo A. Fiorito ◽  
H. B. Suffredini
Keyword(s):  
Electrode Surface ◽  
Screen Printed Electrode ◽  
Screen Printed

scholarly journals Disposable Screen-Printed Electrode Coupled with Recombinant Drosophila melanogaster Acetylcholinesterase and Multiwalled Carbon Nanotubes for Rapid Detection of Pesticides

2011 ◽  
Vol 94 (1) ◽  
pp. 307-312 ◽  
Author(s):  
Zhuzhao Tang ◽  
Haode Chen ◽  
Shiping Song ◽  
Chunhai Fan ◽  
Dabing Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Drosophila Melanogaster ◽  
Multiwalled Carbon Nanotubes ◽  
Water Samples ◽  
Rapid Detection ◽  
Sea Water ◽  
Screen Printed Electrode ◽  
Multiwalled Carbon ◽  
Alternative Means ◽  
Screen Printed

Abstract Recombinant Drosophila melanogaster acetylcholinesterase (R-DmAChE), multiwalled carbon nanotubes (MWCNTs), and Prussian blue have been combined for development of a three-electrode biosensor with more rapid responses and higher stability than in our previous study. A new disposable screen-printed electrode (SPE) was developed for rapid detection of organophosphate and carbamate pesticides. After optimization, 10 μg MWCNT and 5 μL enzyme immobilization solution consisting of 0.2% glutaraldehyde, 0.1% Nafion®, 0.2% bovine serum albumin, 0.1 g/L MWCNT, and 1.5 mU R-DmAChE were fixed on each of the R-DmAChE/MWCNT SPEs. The LOD of this biosensor was 0.5 μg/L for pesticide standards of dichlorvos (DDV) and carbofuran. The performance of this biosensor was tested for vegetable and water samples at various spiked levels, and good stability and sensitivity were found. The obtained recoveries were from 82.6 to 110.5% for DDV at levels of 0.5–5 μg/L and 73.4 to 118.4% for carbofuran at 1–10 μg/L in lake and sea water samples, demonstrating that the proposed approach is an alternative means for rapid detection of pesticide residues and contaminants in food safety and environmental monitoring.

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