Sensitive determination of Amaranth in drinks by highly dispersed CNT in graphene oxide “water” with the aid of small amounts of ionic liquid

Wang, Meiling; Sun, Yang; Yang, Xiya; Zhao, Jianwei

doi:10.1016/j.foodchem.2015.01.143

Cited by 39 publications

(7 citation statements)

References 26 publications

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“…Thus, the data obtained in the present work confirm the assumption made by the authors of the work [ 32 ] that GO acts as a CNT dispersion stabilizer. Moreover, one of our previous works [ 33 ] shows, based on molecular dynamics calculations, that GO sheets are arranged around CNTs.…”

Section: Resultssupporting

confidence: 92%

Characteristics of Epoxy Composites Containing Carbon Nanotubes/Graphene Mixtures

et al. 2023

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The paper considers the development of fillers representing mixtures of carbon nanotubes and graphene materials (graphene oxide and graphene nanoplatelets) in different mass ratios to modify epoxy resin. The effect of graphene type and content on the dispersed phase particle effective sizes—both in aqueous suspensions and the resin—was analyzed. Hybrid particles were characterized by Raman spectroscopy and electron microscopy. The composites containing 0.15–1.00 wt.% CNTs/GO and CNTs/GNPs were thermogravimetrically analyzed, and their mechanical characteristics were determined. SEM images of the composite fracture surfaces were acquired. Optimal dispersions containing 75–100 nm particles were obtained at the CNTs:GO mass ratio of 1:4. It was shown that the CNTs can be located between the GO layers and on the GNP’s surface. The samples containing up to 0.2 wt.% CNTs/GO (at 1:1 and 1:4 ratios) were stable when heated in air up to 300 °C. For 0.15–0.20 wt.% CNTs/GO (at 1:1 ratio), the tensile strength and modulus of the composite increased by 84–88 and 40%, respectively. The increase in the strength characteristics was found to occur due to the interaction of the filler layered structure with the polymer matrix. The obtained composites can be used as structural materials in different fields of engineering.

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Section: Resultssupporting

confidence: 92%

Characteristics of Epoxy Composites Containing Carbon Nanotubes/Graphene Mixtures

et al. 2023

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“…The slope value was found to be less than the Nernstian value (59 mV/pH at 25 • C). A similar behavior was observed by M. Wang et al 43 related to the pH effect on the E pa of amaranth at CNT/GO-[BMIM][PF6]/GCE modified electrode, suggesting a slower electrode reaction.…”

Section: Morphologicalsupporting

confidence: 85%

Graphene/TiO₂-Ag Based Composites Used as Sensitive Electrode Materials for Amaranth Electrochemical Detection and Degradation

Pogăcean

Roşu

Coroș

et al. 2018

J. Electrochem. Soc.

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Graphene/TiO 2 -Ag based composites having various quantities of TiO 2 -Ag nanoparticles (5, 10 or 15 wt%) were successfully prepared through a facile chemical-thermal route. The morphological and structural characteristics of the synthesized materials denoted GTA-5, GTA-10 and GTA-15 were investigated by TEM, XRD and FTIR techniques. The composites were used for the modification of three gold electrodes (Au/GTA-5, Au/GTA-10, Au/GTA-15) which were next employed in the electrochemical detection and degradation of amaranth (an azo dye model). The electrode with the best performance in terms of sensitivity was the Au/GTA-10 electrode. It had considerably larger sensitivity (24 mA/M), in comparison with that of Au/GTA-5 and Au/GTA-15 electrode (8 mA/M and 12 mA/M, respectively). The limit of detection was the same for all modified electrodes (LOD = 1 × 10 −7 M; S/N = 3). The Au/GTA-10 electrode was also tested at the electrochemical degradation of amaranth, from aqueous solutions. The degradation reaction followed a first order kinetics with a half-time of degradation of 203 minutes. The response characteristics of the proposed sensor made it a good candidate for integration in the Ubiquitous sensor's network for IOT.

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“…Electrochemical oxidation of azo dyes has permitted identification with detection limits of less than 0.01 μmol L -1 using selectively modified electrodes for the simultaneous detection of AM and P-4R with MnO2-modified glassy carbon electrode 6 and carbon nanotube-polypyrrole composite, 7 simultaneous detection of AR and P-4R with graphene-TiO2-glassy carbon electrode modified 8 and multi-walled carbon nanotubes 9 and simultaneous detection of AM, P-4R and AR using bismuth film electrode. 10 On the other hand, ionic liquids were incorporated with carbon nanotubes (CNT) on the surface of the modified electrode to improve the dispersibility of CNT and the sensitivity in the determination of AM 11 and CPB surfactant formed aggregate with the dye tartrazina on a hanging mercury drop electrode (HMDE). The latter allowed the determination in the presence of the dye sunset yellow.…”

Section: Introductionmentioning

confidence: 99%

Determination of Allura Red in the Presence of Cetylpyridinium Bromide by Square-wave Adsorptive Stripping Voltammetry on a Glassy Carbon Electrode

Nagles

García‐Beltrán

2018

ANAL. SCI.

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A simple method to determine Allura Red (AR) in cherry gelatin, chili sauce and strawberry juice by square-wave adsorptive stripping voltammetry (SWAdV) in the presence of cetylpyridinium bromide (CPB) is reported. Using a glassy carbon electrode (GCE), Amaranth (AM), Ponceau 4R (P-4R) and AR were oxidized to very close potential values in medium acid pH 3.0 with phosphate buffer solution (PBS), making selective AR detection impossible. Under these conditions AM, P-4R and AR were oxidized at 0.80, 0.77 and 0.81 V, respectively. When small amounts of CPB were added, an AR-CPB aggregate was formed. This change displaced the oxidation almost 0.14 V in the direction of the most positive potential and increased the current almost 50%, while AM and P-4R were oxidized at almost the same potential. Under these conditions, the selective determination of AR in food was possible. Detection limit was 0.032 μmol L-1. Finally, the method was successfully applied to the determination of AR in these foods.

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Sensitive determination of Amaranth in drinks by highly dispersed CNT in graphene oxide “water” with the aid of small amounts of ionic liquid

Cited by 39 publications

References 26 publications

Characteristics of Epoxy Composites Containing Carbon Nanotubes/Graphene Mixtures

Characteristics of Epoxy Composites Containing Carbon Nanotubes/Graphene Mixtures

Graphene/TiO₂-Ag Based Composites Used as Sensitive Electrode Materials for Amaranth Electrochemical Detection and Degradation

Determination of Allura Red in the Presence of Cetylpyridinium Bromide by Square-wave Adsorptive Stripping Voltammetry on a Glassy Carbon Electrode

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Sensitive determination of Amaranth in drinks by highly dispersed CNT in graphene oxide “water” with the aid of small amounts of ionic liquid

Cited by 39 publications

References 26 publications

Characteristics of Epoxy Composites Containing Carbon Nanotubes/Graphene Mixtures

Characteristics of Epoxy Composites Containing Carbon Nanotubes/Graphene Mixtures

Graphene/TiO2-Ag Based Composites Used as Sensitive Electrode Materials for Amaranth Electrochemical Detection and Degradation

Determination of Allura Red in the Presence of Cetylpyridinium Bromide by Square-wave Adsorptive Stripping Voltammetry on a Glassy Carbon Electrode

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Graphene/TiO₂-Ag Based Composites Used as Sensitive Electrode Materials for Amaranth Electrochemical Detection and Degradation