Graphene-titanium dioxide nanocomposite based hypoxanthine sensor for assessment of meat freshness

Albelda, Jasmine A.V; Uzunoğlu, Aytekin; Santos, Gil Nonato C.; Stanciu, Lia

doi:10.1016/j.bios.2016.03.041

Cited by 88 publications

(31 citation statements)

References 63 publications

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“…After the discovery of the unique physicochemical properties of nanomaterials, they have started to be used as catalysts in various applications to achieve improved performance in different applications ranging from energy and sensing to electronic materials (13)(14)(15)(16)(17). By the use of nanoparticles in electrochemical sensors, it became possible to construct electrochemical sensors with enhanced electrochemical performance due to their unique physical, chemical, and catalytic properties (18,19). Nanoparticles show very high electron transfer rate, strong adsorption capacity, and significant physical surface area compared to their bulk counterparts (20)(21)(22).…”

Section: Introductionmentioning

confidence: 99%

The Use of CeO2-TiO2 Nanocomposites as Enzyme Immobilization Platforms in Electrochemical Sensors

Uzunoğlu

2017

Journal of the Turkish Chemical Society, Section A: Chemistry

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The use of metal oxide-based nanoparticles plays a key role in the development of electrochemical sensors with superior properties such as high sensitivity, wide linear range, low limit of detection, and extended storage stability. In this work, we aimed to synthesize CeO2-TiO2 mixed metal oxide nanoparticles which were used as substrate materials for the immobilization of bio-recognition element for the construction of enzyme-based electrochemical sensors. For this purpose, in the first part of the study, CeO2-TiO2 nanoparticles were prepared via a low-temperature co-precipitation method and characterized using X-ray Diffraction (XRD), N2-adsorption, and Transmission Electron Microscopy (TEM) methods. The XRD results confirmed the successful synthesis of CeO2-TiO2 mixed metal oxide nanoparticles with the average crystallite size of 8.51 nm. The calculated crystallite size value was compatible with that obtained from the TEM images. The N2 adsorption results revealed a large surface area of 78.6 cm 2 g-1 which is essential for the construction of electrochemical sensors with improved performance. The electrochemical sensors were developed by the deposition of nanoparticles on the surface of a Pt electrode, followed by the immobilization of lactate oxide enzyme. The electrochemical performance of the sensors was evaluated by cyclic voltammetry (CV) and chronoamperometry methods. The constructed sensors showed a sensitivity of 0.085 ± 0.008 µA µM-1 cm-2 (n=5) with a high reproducibility (RSD % = 1.3) and a wide linear range (0.02-0.6 mM). In addition, the detection limit towards lactate was found be 5.9 µM. The results indicated that the use of CeO2-TiO2 nanoparticles used as a modifier on the surface of the Pt electrode enabled the construction of electrochemical lactate sensors with high sensitivity.

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Section: Introductionmentioning

confidence: 99%

The Use of CeO2-TiO2 Nanocomposites as Enzyme Immobilization Platforms in Electrochemical Sensors

Uzunoğlu

2017

Journal of the Turkish Chemical Society, Section A: Chemistry

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“…Hx biosensor had higher sensitivity than the most reported hypoxanthine biosensors. Limit of detection was slightly higher than that obtained by M. Çubukçu and co‐authors at glassy carbon paste electrode mixed with AuNPs and XOx, where LOD was 0.1 μmol L −1 (Table , lower part ). However, some biosensors with magnetic nanoparticle for xanthine were 10 times more sensitive, but the operating potential was +0.5 V ,, where more compounds can interfere the response signal (Table , lower part).…”

Section: Resultsmentioning

confidence: 65%

A Strategy to Employ Polymerised Riboflavin in the Development of Electrochemical Biosensors

et al. 2017

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Electrochemically polymerised riboflavin (PRf) film was applied in development of glutamate and hypoxanthine biosensors using appropriate oxidases as recognition elements. PRf served as an enzyme immobilisation matrix composed of natural monomer and as a redox mediator. The PRf film was deposited on glassy carbon electrode (GCE) or on the laser‐designed microstructures of the chitosan‐graphene oxide (Chit‐GO) film deposited on glass slide, which served as a chip sensor. The redox polymer was stable and efficient mediator, however, Chit‐GO was placed on the top of PRf/GCE in order to increase the response signal. Such an approach allowed to extend the stability of glutamate and hypoxanthine biosensors to at least 1 month and 15 days, respectively. The chip microelectrode was a single use disposable biosensor due to insufficiently good Chit‐GO adhesion on the top of the cover‐glass. The glutamate microbiosensor had extremely high sensitivity of 16 μA cm−2 μmol L−1.

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“…2 , TiO 2 /PAni and TiO 2 /PAni/GO respectively. There is an increase in pore volume (Vp) of TiO 2 , TiO 2 /PAni and TiO 2 /PAni/GO nanocomposite and pore radius is decreased [36][37][38]. From these results, it may be concluded that the high surface area of the TiO 2 /PAni/GO nanocomposite may favour rapid electron transport and high ion diffusion, allowing improved photochemical performance.…”

Section: ) Scanning Electron Microscopy (Sem)mentioning

confidence: 58%

Comparative Photocatalytic Degradation of Rose Bengal Dye under Visible Light by TiO2, TiO2/PAni and TiO2/PAni/GO Nanocomposites

Kumar¹,

Pandey²

2018

IJRASET

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Graphene-titanium dioxide nanocomposite based hypoxanthine sensor for assessment of meat freshness

Cited by 88 publications

References 63 publications

The Use of CeO2-TiO2 Nanocomposites as Enzyme Immobilization Platforms in Electrochemical Sensors

The Use of CeO2-TiO2 Nanocomposites as Enzyme Immobilization Platforms in Electrochemical Sensors

A Strategy to Employ Polymerised Riboflavin in the Development of Electrochemical Biosensors

Comparative Photocatalytic Degradation of Rose Bengal Dye under Visible Light by TiO2, TiO2/PAni and TiO2/PAni/GO Nanocomposites

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