Polyaniline/graphene quantum dot-modified screen-printed carbon electrode for the rapid determination of Cr(VI) using stopped-flow analysis coupled with voltammetric technique

Talanta ◽  
2016 ◽  
Vol 150 ◽  
pp. 198-205 ◽  
Author(s):  
Eakkasit Punrat ◽  
Chakkarin Maksuk ◽  
Suchada Chuanuwatanakul ◽  
Wanida Wonsawat ◽  
Orawon Chailapakul
Keyword(s):  
Quantum Dot ◽  
Rapid Determination ◽  
Flow Analysis ◽  
Stopped Flow ◽  
Carbon Electrode ◽  
Graphene Quantum Dot ◽  
Screen Printed Carbon Electrode ◽  
Voltammetric Technique ◽  
Screen Printed

A Renewable Amperometric Immunosensor for hs-CRP Based on Functionalized Fe3O4@Au Magnetic Nanoparticles Attracted on Fe (III) Phthlocyanine/Chitosan-Membrane Modified Screen-Printed Carbon Electrode by a Magnet

2011 ◽  
Vol 110-116 ◽  
pp. 519-526 ◽  
Author(s):  
Ning Gan ◽  
Ling Hua Meng ◽  
Fu Tao Hu ◽  
Yu Ting Cao ◽  
Yuan Zhao Wu ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Rapid Determination ◽  
Phosphate Buffer Solution ◽  
Carbon Electrode ◽  
Buffer Solution ◽  
Chitosan Membrane ◽  
Screen Printed Carbon Electrode ◽  
Hs Crp ◽  
Screen Printed

A novel disposable screen-printed immunosensor for rapid determination of highly sensitive C reactiveprotein (hs-CRP) in human serum has been developed in the experiment. The sensor was constructed on one screen-printed carbon electrode (SPCE) with HRP labeled anti-hs-CRP antibody functionalized Fe3O4@Au magnetic nanoparticles (HRP labeled anti hs-CRP/ Fe3O4@Au) as the biorecognition probes attracted on the surface of Fe (III) phthalocyanine (FePc)/ chitosan membrane modified screen-printed carbon electrode (SPCE|FePc/Chit/chitosan) by external magnetic field. FePc was acted as electron immediate. The modified electrode shows an excellent electrocatalytic activity for hs-CRP in phosphate buffer solution (pH=7.0). After the immunosensor is incubated with hs-CRP antigen solution at 37°C for 20 min, the access of activity center of the HRP to electrode is partly inhibited, which leads to a linear decrease of the catalytic efficiency of the HRP to the reduction of immobilized FePc by H2O2 at –50 mV in hs-CRP’s concentration ranges from 1.2 to 200 ng/mL. The detection limit was 0.5ng/mL. The immunosensor was successfully utilized for determination of hs-CRP in real serum samples of heart disease patients, whose results were consistent with that by ELISA method. The accuracy and precision of the assay were 91.5-104.4% and 15.8-24.4%, respectively. The immunosensor was reusable once constructed and can be regenerated by adding new nanoprobes on the surface of basal electrode through magnet on its bottom. It can greatly reduce the detection cost which is valuable for the early diagnosis of tumors.

Electrochemical Behaviour and Rapid Determination of L-Dopa at Electrochemically Pretreated Screen Printed Carbon Electrode

2015 ◽  
Vol 27 (10) ◽  
pp. 2275-2279 ◽  
Author(s):  
Andreea Alexandra Rabinca ◽  
Mihaela Buleandra ◽  
Adriana Balan ◽  
Ioan Stamatin ◽  
Anton Alexandru Ciucu
Keyword(s):  
Rapid Determination ◽  
Electrochemical Behaviour ◽  
Carbon Electrode ◽  
Screen Printed Carbon Electrode ◽  
Screen Printed

scholarly journals An Amperometric Biosensor For Hg(II) Based On Urease/Alginate–Chitosan Membrane Modified Screen Printed Carbon Electrode

2019 ◽  
Vol 14 (3) ◽  
pp. 184
Author(s):  
Rochmad Kris Sanjaya ◽  
Nurul Ismillayli ◽  
Dhony Hermanto
Keyword(s):  
Aqueous Solution ◽  
Rapid Determination ◽  
Electrode System ◽  
Amperometric Biosensor ◽  
Carbon Electrode ◽  
Chitosan Membrane ◽  
Screen Printed Carbon Electrode ◽  
Optimum Measurement ◽  
Screen Printed

A screen-printed three-electrode system is fabricated to prepare a novel screen-printed biosensor for rapid determination of Hg(II) in aqueous solution. The amperometric biosensor is prepared by entrapping urease in alginate–chitosan membrane to modify the screen-printed carbon electrode. The urease/alginate–chitosan membrane for Hg(II) had optimum measurement conditions at work potential of -0.15 V, pH of 7, urea concentration of 75 mM, response time of 8 seconds, inhibition time of 7 minutes and temperature of 25 °C. The resulted biosensor characteristic were found to have the range concentration of Hg(II) ion between 40-90 ppb with the detection limit I10% was 66.45 ppb, the coefficient of variance (Cv) was 0.8%, and reactivation was 5 times reuse.

Sensitive and selective determination of trace amounts of mercury ions using dimercaprol functionalized graphene quantum dot modified glassy carbon electrode

Nanoscale ◽  
2021 ◽  
Author(s):  
Maria Esmaeili ◽  
Fatemeh Ahour ◽  
Sajjad Keshipour
Keyword(s):  
Electron Microscopy ◽  
Quantum Dot ◽  
Carbon Electrode ◽  
Functionalized Graphene ◽  
Mercury Ions ◽  
Modified Glassy Carbon Electrode ◽  
Graphene Quantum Dot ◽  
Selective Determination ◽  
Transmission Electron

A novel nanomaterial is synthesized based on the functionalization of graphene quantum dot with dimercaprol (GQD-DMC). Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy...

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