Electrochemical response of agar ionogels towards glucose detection

We have reported a sensing platform comprising of agar ionogels (IGs) made in ionic liquid solutions (1-octyl-3-methyl imidazolium chloride [C8mim][Cl] and 1-ethyl-3-methylimidazolium chloride [C2mim][Cl]) and used it for glucose oxidase (GOx) immobilization for glucose detection.

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Universal Charge Quenching and Stability of Proteins in 1-Methyl-3-alkyl (Hexyl/Octyl) Imidazolium Chloride Ionic Liquid Solutions

The Journal of Physical Chemistry B ◽

10.1021/jp3049108 ◽

2012 ◽

Vol 116 (36) ◽

pp. 11065-11074 ◽

Cited By ~ 47

Author(s):

Kamla Rawat ◽

H. B. Bohidar

Keyword(s):

Ionic Liquid ◽

Imidazolium Chloride ◽

Liquid Solutions

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Solute–solvent interactions of glycine, l -alanine, and l -valine in aqueous 1-methyl imidazolium chloride ionic liquid solutions in the temperature interval (288.15 to 308.15) K

The Journal of Chemical Thermodynamics ◽

10.1016/j.jct.2015.07.038 ◽

2015 ◽

Vol 91 ◽

pp. 146-155 ◽

Cited By ~ 19

Author(s):

Amalendu Pal ◽

Harsh Kumar ◽

Ritu Maan ◽

Harish Kumar Sharma ◽

Sanjay Sharma

Keyword(s):

Ionic Liquid ◽

Temperature Interval ◽

Imidazolium Chloride ◽

Solvent Interactions ◽

Liquid Solutions

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Carbon nanotubes-ionic liquid nanocomposites sensing platform for NADH oxidation and oxygen, glucose detection in blood

Talanta ◽

10.1016/j.talanta.2012.01.027 ◽

2012 ◽

Vol 91 ◽

pp. 110-115 ◽

Cited By ~ 34

Author(s):

Lu Bai ◽

Dan Wen ◽

Jianyuan Yin ◽

Liu Deng ◽

Chengzhou Zhu ◽

...

Keyword(s):

Carbon Nanotubes ◽

Ionic Liquid ◽

Nadh Oxidation ◽

Glucose Detection ◽

Sensing Platform

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Effect of persistence length on binding of DNA to polyions and overcharging of their intermolecular complexes in aqueous and in 1-methyl-3-octyl imidazolium chloride ionic liquid solutions

Physical Chemistry Chemical Physics ◽

10.1039/c3cp51246k ◽

2013 ◽

Vol 15 (29) ◽

pp. 12262 ◽

Cited By ~ 19

Author(s):

Kamla Rawat ◽

Jyotsana Pathak ◽

H. B. Bohidar

Keyword(s):

Ionic Liquid ◽

Persistence Length ◽

Imidazolium Chloride ◽

Intermolecular Complexes ◽

Liquid Solutions

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Paper-Based Competitive Immunochromatography Coupled with an Enzyme-Modified Electrode to Enable the Wireless Monitoring and Electrochemical Sensing of Cotinine in Urine

Sensors ◽

10.3390/s21051659 ◽

2021 ◽

Vol 21 (5) ◽

pp. 1659

Author(s):

Nutcha Larpant ◽

Pramod K. Kalambate ◽

Tautgirdas Ruzgas ◽

Wanida Laiwattanapaisal

Keyword(s):

Glucose Oxidase ◽

Modified Electrode ◽

Near Field ◽

Electrochemical Measurement ◽

Electrochemical Sensing ◽

Urine Samples ◽

Lateral Flow Strip ◽

Wireless Monitoring ◽

Sensing Platform ◽

Combined Strategy

This paper proposes a combined strategy of using paper-based competitive immunochromatography and a near field communication (NFC) tag for wireless cotinine determination. The glucose oxidase labeled cotinine antibody specifically binds free cotinine in a sample, whereas the unoccupied antibody attached to BSA-cotinine at the test line on a lateral flow strip. The glucose oxidase on the strip and an assistant pad in the presence of glucose generated H2O2 and imposed the Ag oxidation on the modified electrode. This enabled monitoring of immunoreaction by either electrochemical measurement or wireless detection. Wireless sensing was realized for cotinine in the range of 100–1000 ng/mL (R2 = 0.96) in PBS medium. Undiluted urine samples from non-smokers exhibited an Ag-oxidation rate three times higher than the smoker’s urine samples. For 1:8 diluted urine samples (smokers), the proposed paper-based competitive immunochromatography coupled with an enzyme-modified electrode differentiated positive and negative samples and exhibited cotinine discrimination at levels higher than 12 ng/mL. This novel sensing platform can potentially be combined with a smartphone as a reader unit.

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Electrochemical Response of Glucose Oxidase Adsorbed on Laser-Induced Graphene

Nanomaterials ◽

10.3390/nano11081893 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1893

Author(s):

Sónia O. Pereira ◽

Nuno F. Santos ◽

Alexandre F. Carvalho ◽

António J. S. Fernandes ◽

Florinda M. Costa

Keyword(s):

Electron Transfer ◽

Glucose Oxidase ◽

Ph Dependence ◽

High Surface ◽

High Surface Area ◽

Cost Effective ◽

Great Promise ◽

Glucose Detection ◽

Half Wave ◽

Electrochemical Transducers

Carbon-based electrodes have demonstrated great promise as electrochemical transducers in the development of biosensors. More recently, laser-induced graphene (LIG), a graphene derivative, appears as a great candidate due to its superior electron transfer characteristics, high surface area and simplicity in its synthesis. The continuous interest in the development of cost-effective, more stable and reliable biosensors for glucose detection make them the most studied and explored within the academic and industry community. In this work, the electrochemistry of glucose oxidase (GOx) adsorbed on LIG electrodes is studied in detail. In addition to the well-known electroactivity of free flavin adenine dinucleotide (FAD), the cofactor of GOx, at the expected half-wave potential of −0.490 V vs. Ag/AgCl (1 M KCl), a new well-defined redox pair at 0.155 V is observed and shown to be related to LIG/GOx interaction. A systematic study was undertaken in order to understand the origin of this activity, including scan rate and pH dependence, along with glucose detection tests. Two protons and two electrons are involved in this reaction, which is shown to be sensitive to the concentration of glucose, restraining its origin to the electron transfer from FAD in the active site of GOx to the electrode via direct or mediated by quinone derivatives acting as mediators.

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