scholarly journals Novel electrochemical redox-active species: one-step synthesis of polyaniline derivative-Au/Pd and its application for multiplexed immunoassay

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Liyuan Wang ◽  
Feng Feng ◽  
Zhanfang Ma
Keyword(s):  
Active Species ◽  
Redox Active ◽  
One Step ◽  
Electrochemical Redox ◽  
Multiplexed Immunoassay ◽  
Polyaniline Derivative

scholarly journals Rapid electrochemical detection of coronavirus SARS-CoV-2

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Thanyarat Chaibun ◽  
Jiratchaya Puenpa ◽  
Tatchanun Ngamdee ◽  
Nimaradee Boonapatcharoen ◽  
Pornpat Athamanolap ◽  
...  
Keyword(s):  
Electrochemical Biosensor ◽  
Rolling Circle Amplification ◽  
Clinical Samples ◽  
Rolling Circle ◽  
Qrt Pcr ◽  
Reverse Transcription Pcr ◽  
Sandwich Hybridization ◽  
Redox Active ◽  
One Step ◽  
The One

AbstractCoronavirus disease 2019 (COVID-19) is a highly contagious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Diagnosis of COVID-19 depends on quantitative reverse transcription PCR (qRT-PCR), which is time-consuming and requires expensive instrumentation. Here, we report an ultrasensitive electrochemical biosensor based on isothermal rolling circle amplification (RCA) for rapid detection of SARS-CoV-2. The assay involves the hybridization of the RCA amplicons with probes that were functionalized with redox active labels that are detectable by an electrochemical biosensor. The one-step sandwich hybridization assay could detect as low as 1 copy/μL of N and S genes, in less than 2 h. Sensor evaluation with 106 clinical samples, including 41 SARS-CoV-2 positive and 9 samples positive for other respiratory viruses, gave a 100% concordance result with qRT-PCR, with complete correlation between the biosensor current signals and quantitation cycle (Cq) values. In summary, this biosensor could be used as an on-site, real-time diagnostic test for COVID-19.

Computational Study on Compound I Redox-Active Species in Horseradish Peroxydase Enzyme: Conformational Fluctuations and Solvation Effects

2010 ◽  
Vol 114 (20) ◽  
pp. 6817-6824 ◽  
Author(s):  
Costantino Zazza ◽  
Amedeo Palma ◽  
Nico Sanna ◽  
Simone Tatoli ◽  
Massimiliano Aschi
Keyword(s):  
Computational Study ◽  
Active Species ◽  
Compound I ◽  
Solvation Effects ◽  
Redox Active

Redox-Active Ionic-Liquid-Assisted One-Step General Method for Preparing Gold Nanoparticle Thin Films: Applications in Refractive Index Sensing and Catalysis

Langmuir ◽  
2010 ◽  
Vol 26 (22) ◽  
pp. 17568-17580 ◽  
Author(s):  
Enakshi Dinda ◽  
Md. Harunar Rashid ◽  
Mrinmoy Biswas ◽  
Tarun K. Mandal
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Ionic Liquid ◽  
Gold Nanoparticle ◽  
Refractive Index Sensing ◽  
Redox Active ◽  
One Step ◽  
General Method

scholarly journals Biochemical characterization of the purple form of Marinobacter hydrocarbonoclasticus nitrous oxide reductase

2012 ◽  
Vol 367 (1593) ◽  
pp. 1204-1212 ◽  
Author(s):  
Simone Dell'Acqua ◽  
Sofia R. Pauleta ◽  
José J. G. Moura ◽  
Isabel Moura
Keyword(s):  
Nitrous Oxide ◽  
Redox State ◽  
Biochemical Characterization ◽  
Specific Activity ◽  
Active Species ◽  
Nitrous Oxide Reductase ◽  
Strictly Anaerobic ◽  
Prolonged Incubation ◽  
Redox Active ◽  
Marinobacter Hydrocarbonoclasticus

Nitrous oxide reductase (N 2 OR) catalyses the final step of the denitrification pathway—the reduction of nitrous oxide to nitrogen. The catalytic centre (CuZ) is a unique tetranuclear copper centre bridged by inorganic sulphur in a tetrahedron arrangement that can have different oxidation states. Previously, Marinobacter hydrocarbonoclasticus N 2 OR was isolated with the CuZ centre as CuZ*, in the [1Cu 2+ : 3Cu + ] redox state, which is redox inert and requires prolonged incubation under reductive conditions to be activated. In this work, we report, for the first time, the isolation of N 2 OR from M. hydrocarbonoclasticus in the ‘purple’ form, in which the CuZ centre is in the oxidized [2Cu 2+ : 2Cu + ] redox state and is redox active. This form of the enzyme was isolated in the presence of oxygen from a microaerobic culture in the presence of nitrate and also from a strictly anaerobic culture. The purple form of the enzyme was biochemically characterized and was shown to be a redox active species, although it is still catalytically non-competent, as its specific activity is lower than that of the activated fully reduced enzyme and comparable with that of the enzyme with the CuZ centre in either the [1Cu 2+ : 3Cu + ] redox state or in the redox inactive CuZ* state.

Imaging concentration profiles of redox-active species in open-circuit corrosion processes with the scanning electrochemical microscope

2004 ◽  
Vol 6 (11) ◽  
pp. 1212-1215 ◽  
Author(s):  
A.C. Bastos ◽  
A.M. Simões ◽  
S. González ◽  
Y. González-García ◽  
R.M. Souto
Keyword(s):  
Active Species ◽  
Open Circuit ◽  
Concentration Profiles ◽  
Scanning Electrochemical Microscope ◽  
Redox Active

Pseudocapacitance and excellent cyclability of 2,5-dimethoxy-1,4-benzoquinone on graphene

2016 ◽  
Vol 9 (8) ◽  
pp. 2586-2594 ◽  
Author(s):  
Muhammad Boota ◽  
Chi Chen ◽  
Matthieu Bécuwe ◽  
Ling Miao ◽  
Yury Gogotsi
Keyword(s):  
Graphene Oxide ◽  
Hydrothermal Method ◽  
Reduced Graphene Oxide ◽  
Three Dimensional ◽  
Covalent Functionalization ◽  
Redox Active ◽  
Reduced Graphene ◽  
One Step ◽  
Volumetric Capacitance ◽  
Graphene Oxide Sheets

Non-covalent functionalization of 2,5-dimethoxy-1,4-benzoquinone and hydroquinone on reduced graphene oxide sheets led to the formation of a redox-active three-dimensional gel architecture via a one-step hydrothermal method, where the former exhibited high gravimetric and volumetric capacitance and 99% capacitance retention after 25 000 cycles at 50 mV s−1.

Redox chemistry of CeO2 nanoparticles in aquatic systems containing Cr(vi)(aq) and Fe2+ ions

2019 ◽  
Vol 6 (7) ◽  
pp. 2269-2280
Author(s):  
Jessica R. Ray ◽  
Xuanhao Wu ◽  
Chelsea W. Neil ◽  
Haesung Jung ◽  
Zhichao Li ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Redox Chemistry ◽  
Industrial Applications ◽  
Active Species ◽  
Ceo2 Nanoparticles ◽  
Aquatic Systems ◽  
Aquatic Environments ◽  
Catalytic Activities ◽  
Redox Active

CeO2 nanoparticles are extensively used in industrial applications owing to their high redox-catalytic activities and, as a result, may appear in aquatic environments where they undergo significant surface chemistry transformation with other redox-active species.

scholarly journals “Wiring” redox-active polyoxometalates to carbon nanotubes using a sonication-driven periodic functionalization strategy

2016 ◽  
Vol 9 (3) ◽  
pp. 1095-1101 ◽  
Author(s):  
Jun Hu ◽  
Yuanchun Ji ◽  
Wei Chen ◽  
Carsten Streb ◽  
Yu-Fei Song
Keyword(s):  
Carbon Nanotubes ◽  
Lithium Ion Batteries ◽  
High Performance ◽  
Lithium Ion ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Redox Active ◽  
One Step ◽  
Walled Carbon Nanotubes

A universal one-step strategy for the periodic deposition of redox-active polyoxometalate nanocrystals on single-walled carbon nanotubes is reported, giving access to high-performance electrodes for lithium-ion batteries.

Polyaniline membrane based potentiometric sensor for ascorbic acid, other redox active species and chloride

2007 ◽  
Vol 611 (1-2) ◽  
pp. 162-168 ◽  
Author(s):  
N.M. Kocherginsky ◽  
Zheng Wang
Keyword(s):  
Ascorbic Acid ◽  
Active Species ◽  
Potentiometric Sensor ◽  
Redox Active
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