Heparin-stabilized gold nanoparticles-based CUPRAC colorimetric sensor for antioxidant capacity measurement

Bener, Mustafa; Şen, Furkan Burak; Apak, Reşat

doi:10.1016/j.talanta.2018.05.021

Cited by 31 publications

(15 citation statements)

References 39 publications

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“…Giorgi-Coll et al synthesized heparin-coated gold nanoparticles of 15 ± 1.3 nm [43], and another work by Bener et al reported that the size nanoparticles of the same type was 42 nm [44]. In the first case, the nanoparticle size is comparable to the values obtained in the present study, while in the second case, the nanoparticle size is bigger than the largest size obtained in the present work.…”

Section: Discussionsupporting

confidence: 79%

Antifungal and Cytotoxic Evaluation of Photochemically Synthesized Heparin-Coated Gold and Silver Nanoparticles

et al. 2020

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Heparin-based silver nanoparticles (AgHep-NPs) and gold nanoparticles (AuHep-NPs) were produced by a photochemical method using silver nitrate and chloroauric acid as metal precursors and UV light at 254 nm. UV–Vis spectroscopy graphs showed absorption for AgHep-NPs and AuHep-NPs at 420 nm and 530 nm, respectively. TEM revealed a pseudospherical morphology and a small size, corresponding to 10–25 nm for AgHep-NPs and 1.5–7.5 nm for AuHep-NPs. Their antifungal activity against Candida albicans, Issatchenkia orientalis (Candida krusei), and Candida parapsilosis was assessed by the microdilution method. We show that AgHep-NPs were effective in decreasing fungus density, whereas AuHep-NPs were not. Additionally, the viability of human gingival fibroblasts was preserved by both nanoparticle types at a level above 80%, indicating a slight cytotoxicity. These results are potentially useful for applications of the described NPs mainly in dentistry and, to a lesser extent, in other biomedical areas.

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Section: Discussionsupporting

confidence: 79%

Antifungal and Cytotoxic Evaluation of Photochemically Synthesized Heparin-Coated Gold and Silver Nanoparticles

et al. 2020

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“…Labelled value of H 2 %2.97 � 0.02, t exp :2.6 (P:0.05, 2) F exp : 4.0 (P:0.05, 2, 2) t critical : 4.30 (P:0.05, 2), F critical : 19 (P:0.05, 2, 2). [64]…”

Section: Samplementioning

confidence: 99%

“…After introducing this important reagent to world literature, a great many studies on the TAC of various samples such as foods, beverages, pharmaceutical formulations etc. have been reported using spectrophotometry/colorimetry, reflectometry, chromatography (HPLC with UV detector) and electroanalytical methods (voltammetry and amperometry) . CUPRAC has not been only used in the determination of TAC studies, but also in the determination of ascorbic acid, catalase activity assay for biological samples, hydrogen peroxide, hydroxyl radical scavenging assay and detection of xanthine oxidase inhibition activity of phenolic compounds and flavonoids.…”

Section: Introductionmentioning

confidence: 99%

A New Redox Mediator (Cupric‐Neocuproine Complex)‐ Modified Pencil Graphite Electrode for the Electrocatalytic Oxidation of H₂O₂: A Flow Injection Amperometric Sensor

2020

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This paper introduces the cupric‐neocuproine complex ([Cu(Nc)2]2+) as a new redox mediator for the electrocatalytic oxidation of H2O2. For this purpose, [Cu(Nc)2]2+ was modified onto a disposable pencil graphite electrode (PGE) surface by using Nafion (Nf) as a cation‐exchange membrane for the effective adsorption of complex. The modified electrode was prepared by immersing Nf‐adsorbed PGE into [Cu(Nc)2]2+ complex solution (0.40 mM of Cu2+ and 0.80 mM of Nc prepared at pH 4.76 in 0.10 M acetate buffer). SEM images and EDX spectra of electrodes were presented for the elucidation of their surface morphologies. Cyclic voltammetric results showed that H2O2 was electrocatalytically oxidized at [Cu(Nc)2]2+/Nf/PGE, because both the increase in current and the potential shift to a more negative direction were observed for oxidation of H2O2 at [Cu(Nc)2]2+/Nf/PGE in comparison to bare PGE. Then, the electrocatalytic activity of [Cu(Nc)2]2+/Nf/PGE toward H2O2 oxidation was utilized for amperometric determination of H2O2 in flow injection analysis (FIA) system. Flow injection (FI) amperometric studies showed two linear calibration ranges (1.0‐1000.0 μM (R2=0.9958) and 1000.0‐10000.0 μM (R2=0.9902) with a detection limit of 0.4 μM H2O2 which is considered good for electroanalytical determinations, especially for electrocatalytic oxidation. To test the applicability of the developed FI amperometric hydrogen peroxide sensor, H2O2 contents of some relevant samples were determined.

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“…A sensitive AgNPs spectrophotometric method for antioxidant capacity has been developed, based on the ability of natural polyphenols to reduce Ag(I) and stabilize the produced Ag(0)NPs [69]. Other colorimetric methods have been developed for the AOC assays: AuNPs based in tea extract [70] and olive oil [71]; PtNPs [72] for the methanolic and aqueous extracts of teas and infusions.…”

Section: Nutrients and Bioactive Compoundsmentioning

confidence: 99%

Noble Metal Nanoparticles Applications: Recent Trends in Food Control

Vinci

Rapa

2019

Bioengineering

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Scientific research in the nanomaterials field is constantly evolving, making it possible to develop new materials and above all to find new applications. Therefore, nanoparticles (NPs) are suitable for different applications: nanomedicine, drug delivery, sensors, optoelectronics and food control. This review explores the recent trend in food control of using noble metallic nanoparticles as determination tools. Two major uses of NPs in food control have been found: the determination of contaminants and bioactive compounds. Applications were found for the determination of mycotoxins, pesticides, drug residues, allergens, probable carcinogenic compounds, bacteria, amino acids, gluten and antioxidants. The new developed methods are competitive for their use in food control, demonstrated by their validation and application to real samples.

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Heparin-stabilized gold nanoparticles-based CUPRAC colorimetric sensor for antioxidant capacity measurement

Cited by 31 publications

References 39 publications

Antifungal and Cytotoxic Evaluation of Photochemically Synthesized Heparin-Coated Gold and Silver Nanoparticles

Antifungal and Cytotoxic Evaluation of Photochemically Synthesized Heparin-Coated Gold and Silver Nanoparticles

A New Redox Mediator (Cupric‐Neocuproine Complex)‐ Modified Pencil Graphite Electrode for the Electrocatalytic Oxidation of H₂O₂: A Flow Injection Amperometric Sensor

Noble Metal Nanoparticles Applications: Recent Trends in Food Control

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Heparin-stabilized gold nanoparticles-based CUPRAC colorimetric sensor for antioxidant capacity measurement

Cited by 31 publications

References 39 publications

Antifungal and Cytotoxic Evaluation of Photochemically Synthesized Heparin-Coated Gold and Silver Nanoparticles

Antifungal and Cytotoxic Evaluation of Photochemically Synthesized Heparin-Coated Gold and Silver Nanoparticles

A New Redox Mediator (Cupric‐Neocuproine Complex)‐ Modified Pencil Graphite Electrode for the Electrocatalytic Oxidation of H2O2: A Flow Injection Amperometric Sensor

Noble Metal Nanoparticles Applications: Recent Trends in Food Control

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A New Redox Mediator (Cupric‐Neocuproine Complex)‐ Modified Pencil Graphite Electrode for the Electrocatalytic Oxidation of H₂O₂: A Flow Injection Amperometric Sensor