Oxalic acid capped iron oxide nanorods as a sensing platform

Sharma, Anshu; Baral, Dinesh; Bohidar, H. B.; Solanki, Pratima R.

doi:10.1016/j.cbi.2015.05.020

Cited by 29 publications

(11 citation statements)

References 34 publications

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“…This result also proved that GOx enzyme was successfully immobilised onto the ZnO nanorod surface and retained its bioactivity. The average surface concentration (Γ) of the electroactive site of GOx enzymes on the ZnO nanorod matrix surface can be estimated based on the slope of I p versus v (Brown–Anson model) 56 . where n is the number of electrons transferred, F is the Faraday constant (96485.34 C/mol), A is the surface area of electrode (1 cm 2 ), R is the gas constant (8.314 J/mol·K), T is the absolute temperature (298 K) and I p /v is the slope of the calibration plot (scan rate value).…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of Glucose Biosensors by Using Hydrothermally Grown ZnO Nanorods

Ridhuan

Razak

Lockman

2018

Sci Rep

114

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Highly oriented ZnO nanorod (NR) arrays were fabricated on a seeded substrate through a hydrothermal route. The prepared ZnO nanorods were used as an amperometric enzyme electrode, in which glucose oxidase (GOx) was immobilised through physical adsorption. The modified electrode was designated as Nafion/GOx/ZnO NRs/ITO. The morphology and structural properties of the fabricated ZnO nanorods were analysed using field-emission scanning electron microscope and X-ray diffractometer. The electrochemical properties of the fabricated biosensor were studied by cyclic voltammetry and amperometry. Electrolyte pH, electrolyte temperature and enzyme concentration used for immobilisation were the examined parameters influencing enzyme activity and biosensor performance. The immobilised enzyme electrode showed good GOx retention activity. The amount of electroactive GOx was 7.82 × 10−8 mol/cm2, which was relatively higher than previously reported values. The Nafion/GOx/ZnO NRs/ITO electrode also displayed a linear response to glucose ranging from 0.05 mM to 1 mM, with a sensitivity of 48.75 µA/mM and a low Michaelis–Menten constant of 0.34 mM. Thus, the modified electrode can be used as a highly sensitive third-generation glucose biosensor with high resistance against interfering species, such as ascorbic acid, uric acid and L-cysteine. The applicability of the modified electrode was tested using human blood samples. Results were comparable with those obtained using a standard glucometer, indicating the excellent performance of the modified electrode.

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Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of Glucose Biosensors by Using Hydrothermally Grown ZnO Nanorods

Ridhuan

Razak

Lockman

2018

Sci Rep

114

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“…Figure S5b indicates that the determination of redox peak current densities were linearly dependent on the scanning rate (mV·s –1 ) with linear regression values ( R 2 ) of 0.9923 for the anodic and 0.9919 for the cathodic peak potentials, indicating that the reaction processes of catechol are a surface-controlled process rather than a diffusion-controlled process . The diffusion coefficient of the redox species from the catechol to the AuNPs/CS@N,S co-doped MWCNTS was calculated using the following Randles–Sevcik equation: where I p is the peak current of the AuNPs/CS@N,S co-doped MWCNTS ( I pa anodic and I pc cathodic), n is the number of electrons involved or electron stoichiometry, A is the surface area of the electrode (0.07 cm 2 ), D is the diffusion coefficient, C is the concentration of the redox species (2 mM catechol), and v is the scan rate (20 mV·s –1 ). The calculated D value for AuNPs/CS@N,S co-doped MWCNTS is 3.48 × 10 –5 cm 2 ·s –1 .…”

Section: Resultsmentioning

confidence: 99%

Gold Nanoparticle/Chitosan@N,S Co-doped Multiwalled Carbon Nanotubes Sensor: Fabrication, Characterization, and Electrochemical Detection of Catechol and Nitrite

Rao

Liu

Zhong

et al. 2017

ACS Sustainable Chem. Eng.

101

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Given that catechol and nitrite can be easily released into the environment and cause serious damage to our physical and ecological environment, it is necessary to develop a fast and reliable detection method for catechol and nitrite analysis. In our work, an electrochemical catechol and nitrite sensor was created based on gold nanoparticles (AuNPs) deposited on chitosan@N,S co-doped multiwalled carbon nanotubes (CS@N,S co-doped MWCNTS) composite modified glassy carbon electrode. The preliminary prepared composite materials were characterized by transmission electron microscope, scanning electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The AuNPs/CS@N,S co-doped MWCNTS modified electrode shows a good linear relationship between 1 μmol·L–1 (μM) and 5000 μM for catechol, and the detection limit was calculated as 0.2 μM. For nitrite the linear relationship was 1–7000 μM with the detection limit of 0.2 μM. The sensitivity of the created sensor was evaluated as 0.9081 μA·μM–1·cm–2 for catechol, and for nitrite it was 0.7595 μA·μM–1·cm–2. Also the sensor shows significant selectivity, reproducibility, and stability. Moreover, the modified electrode is also applied in tap water samples for the catechol measurement and nitrite in fermented bean curd, ham sausage, and mustard tuber samples.

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“…Thus, the detection of this V. cholerae toxin B is important; it requires a rapid, sensitive, and effective analytical tool such as an immunosensor. During last few years, immunosensors based on different nanostructured materials for the detection of Vc T have been reported . Table S1 in the Supporting Information shows the biosensing response of these electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…During last few years, immunosensors based on different nanostructured materials for the detection of VcT have been reported. [27][28][29][30][31][32][33] Table S1 in the Supporting Information shows the biosensing response of these electrodes. Arshak et al 34 have reported a polyaniline grafted on a lignin-based sensing platform for the detection of foodborne pathogens, including Salmonella species, Bacillus cereus, and Vibrio parahaemolyticus without antibodies (Abs) and monitored changes in the resistance after the interaction of bacteria with the sensor.…”

Section: Introductionmentioning

confidence: 99%

Functionalized polyacrylonitrile‐nanofiber based immunosensor for Vibrio cholerae detection

Gupta

Dhakate

et al. 2016

J of Applied Polymer Sci

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Polyacrylonitrile nanofibers (PANnf's) were electrospun directly onto an indium tin oxide (ITO)‐coated glass substrate. The PANnf/ITO electrode was partially hydrolyzed with an NaOH aqueous solution at ambient temperature to convert the nitrile groups of the PANnf's into carboxyl groups was confirmed by Fourier transform infrared spectroscopy. Furthermore, 1‐ethyl‐3‐(3‐dimethylaminopropyl) carbodiimide–N‐hydroxy succinimide chemistry was used to activate the COOH groups of PANnf's for the covalent co‐immobilization of monoclonal antibodies against Vibrio cholerae and bovine serum albumin for V. cholerae toxin detection. Structural, functional, and electrochemical studies of the PANnf/ITO electrode and BSA/Ab/PANnf/ITO immunoelectrode were performed, and found a uniform distribution of nanofibers with diameter of 325 ± 7.7% nm. The electrochemical response studies showed an improved sensing performance of the immunoelectrode with a detection of 6.25–500 ng/mL, a low limit of detection of 0.22 ng/mL, a sensitivity of 90 nA ng−1 mL cm−2, an association constant of 45.2 ng/mL, and a dissociation constant of 8 ng/mL. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44170.

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Oxalic acid capped iron oxide nanorods as a sensing platform

Cited by 29 publications

References 34 publications

Fabrication and Characterization of Glucose Biosensors by Using Hydrothermally Grown ZnO Nanorods

Fabrication and Characterization of Glucose Biosensors by Using Hydrothermally Grown ZnO Nanorods

Gold Nanoparticle/Chitosan@N,S Co-doped Multiwalled Carbon Nanotubes Sensor: Fabrication, Characterization, and Electrochemical Detection of Catechol and Nitrite

Functionalized polyacrylonitrile‐nanofiber based immunosensor for Vibrio cholerae detection

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