EDTA-β-cyclodextrin functionalized graphene for electrochemical detection and scavenge of DPPH radical

Zuo, Yu; Zhang, Guojuan; Fan, Lifang; Liu, Zhiguang; Guo, Yujing

doi:10.1007/s10800-021-01598-2

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…In addition, the Lambert–Beer law limits the spectrophotometric method, resulting in a careful selection of the concentration of the samples to be analyzed . On the other hand, electroanalytical methods can provide a lower detection limit than spectrophotometric ones, which provides an important advantage: expanding the range of sample concentrations with simple operation, low cost, and high sensitivity. ,, Goodwin et al applied an electroanalytical method based on the reaction of the aminophenol for indirect sensing of anticarcinogenic catechin compounds epigallocatechin gallate (EGCG) and epigallocatechin (EGC). In this case, the quinoneimine oxidation product, obtained from the oxidation of aminophenol in aqueous solutions, chemically reacts with the EGCG or EGC compounds.…”

Section: Introductionmentioning

confidence: 99%

Rapid Quantification of Antioxidant Capacity in Tea Using Laser-Induced Graphene Electrodes

Inoque,

Araújo,

de Lima

et al. 2024

ACS Food Sci. Technol.

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This paper describes a new analytical method based on laser-induced graphene (LIG) electrodes for evaluating antioxidant capacity in tea by quantifying the consumption of the 2,2-diphenyl-2-picrylhydrazyl (DPPH) radical. The LIG electrodes were produced by pyrolysis using a CO 2 infrared laser source (10 electrodes were produced in 5 min). The LIG sensor was coupled to a three-dimensional (3D)-printed batch-injection analysis cell to amperometrically detect the remaining DPPH. The sensing properties included a linear range from 2 to 900 μmol L −1 (R 2 > 0.99), adequate limit of detection (LOD = 0.6 μmol L −1 ), fast responses (∼10 s), and good precision relative standard deviation (RSD < 4.0%). The efficient concentration of tea samples necessary to reduce the initial DPPH concentration by 50% (EC 50 ) was determined after incubation with DPPH radicals for 30 min. The results of EC 50 showed good agreement with the conventional spectrophotometric results. Therefore, LIG electrodes are a powerful analytical tool for applications in teas.

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Section: Introductionmentioning

confidence: 99%

Rapid Quantification of Antioxidant Capacity in Tea Using Laser-Induced Graphene Electrodes

Inoque,

Araújo,

de Lima

et al. 2024

ACS Food Sci. Technol.

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“…The stability of the material is also contributed by the covalent amine linkage between the EDTA groups and rGO. A lot of efforts have been made earlier to synthesize EDTA-based graphene composites through chemical methods such as silanization, solvothermal, hydrothermal methods, etc. These materials have been widely used in the adsorption of metal ions − and organic pollutants. − The EDTA-modified electrodes , and their composites on graphene , and polymer supports have been used for electrochemical sensing of various analytes .…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Quantitation of Lead and Cadmium on an EDTA-Reduced Graphene Oxide-Modified Glassy Carbon Electrode

Sridharan

Mandal

2022

ACS Omega

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Cadmium (Cd) and lead (Pb) are classified as category one toxicants. The provisional guideline values, according to the World Health Organization (WHO), for Cd and Pb are 3 and 10 ppb, respectively. An easy, quick, and cheap analytical technique is in demand for the determination of these toxic heavy metals in water. Hence, a novel electrochemical sensing platform is developed by modifying the glassy carbon electrode with ethylenediaminetetraacetic acid (EDTA)-functionalized reduced graphene oxide (ErGO) for the low-cost simultaneous quantitation of toxic heavy-metal ions, lead and cadmium, in real water samples. EDTA is grafted to the surface of graphene oxide, via amine linkage, and the oxygen functionality is reduced by a green agent, tyrosine. Various physical and electrochemical characterizations of the as-prepared electrocatalytic material were performed by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), ζ-potential, ultraviolet diffuse reflectance spectroscopy (UV-DRS), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), etc. The glassy carbon electrode (GCE) is modified with ErGO by a simple drop-casting method for simultaneous metal-ion quantitation by differential pulse voltammetry (DPV). EDTA functionalization of graphene oxide and its further reduction using the green agent enhance the stability and sensitivity of the electrode substrate. The limits of detection for cadmium and lead ions calculated for ErGO/GCE are 1.02 and 2.52 ppb, while the limits of quantification for lead and cadmium ions are 3.41 and 8.4 ppb, and their sensitivities are 0.8 and 0.6 nA/ppb, respectively. Real river water contains 200.2 ± 0.38 ppb of Pb 2+ ions (mean ± stdev, n = 3) by the DPV technique, which is validated by ICP-OES analysis.

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EDTA-β-cyclodextrin functionalized graphene for electrochemical detection and scavenge of DPPH radical

Cited by 2 publications

References 36 publications

Rapid Quantification of Antioxidant Capacity in Tea Using Laser-Induced Graphene Electrodes

Rapid Quantification of Antioxidant Capacity in Tea Using Laser-Induced Graphene Electrodes

Simultaneous Quantitation of Lead and Cadmium on an EDTA-Reduced Graphene Oxide-Modified Glassy Carbon Electrode

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