Polyphenol-grafted collagen fiber as reductant and stabilizer for one-step synthesis of size-controlled gold nanoparticles and their catalytic application to 4-nitrophenol reduction

Wu, Hao; Huang, Xin; Gao, Mingming; Liao, Xuepin; Shi, Bi

doi:10.1039/c0gc00843e

Cited by 171 publications

(126 citation statements)

References 72 publications

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“…Second, CDs have excellent photo-chemical properties (photoinduced electron transfer and redox properties, luminescence and so on) [195]. Third, the surface of CDs is adjustable with overall oxygen contents ranging from 5 to 50 wt%, depending upon the experimental conditions used [196]. Finally, the functional groups (-OH, -COOH, etc.)…”

Section: Cds Stabilized Gold Nanoparticlesmentioning

confidence: 99%

Catalytic Applications of Carbon Dots

Kang

Liu

2016

Carbon Nanostructures

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Carbon materials have been used for a long time in heterogeneous catalysis, which can satisfy most of the desirable properties required for a suitable catalyst support. Based on their significant advantages, such as low cost, huge amount, easy accessibility, high surface area, diverse porous structure, and resistance to acidic or basic environments, the carbon nanostructures are hungered for using as proper catalysts directly. Carbon dots (CDs), a new class of carbon nanomaterials with sizes below 10 nm, were also demonstrated to be efficient catalysts, such as, photocatalysts for selective oxidation, light-driven acid-catalysis and hydrogen bond catalysis. In this chapter, we will highlight the preparative methods, which have been used successfully to produce active, selective and durable CDs catalysts and look at their properties and the reactions which they promote. We then consider the catalysts design based on these new CDs and look into the future.

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Section: Cds Stabilized Gold Nanoparticlesmentioning

confidence: 99%

Catalytic Applications of Carbon Dots

Kang

Liu

2016

Carbon Nanostructures

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“…[35][36][37] Polyphenols such as EGCG demonstrated to be efficient ligands for metal ions and multiple phenolic hydroxyls are able to bind Au 3+ ions by forming stable chelating rings. As a consequence of complexation, a redox reaction occurs, and the chelated Au 3+ ions are reduced to Au 0 atoms in situ, while a part of the phenolic hydroxyls is simultaneously oxidized to corresponding quinone.…”

Section: Introductionmentioning

confidence: 99%

Single-step green synthesis and characterization of gold-conjugated polyphenol nanoparticles with antioxidant and biological activities

Sanna

Pala

Dessì

et al. 2014

IJN

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Background Gold nanoparticles (GNPs) are likely to provide an attractive platform for combining a variety of biophysicochemical properties into a unified nanodevice with great therapeutic potential. In this study we investigated the capabilities of three different natural polyphenols, epigallocatechin-3-gallate (EGCG), resveratrol (RSV), and fisetin (FS), to allow synergistic chemical reduction of gold salts to GNPs and stabilization in a single-step green process. Moreover, antioxidant properties of the nanosystems, as well as preliminary antiproliferative activity and apoptotic process investigation of model EGCG-GNPs on stable clones of neuroblastoma SH-SY5Y cells expressing CFP-DEVD-YFP reporter, were examined. Methods The GNPs were characterized by physicochemical techniques, polyphenol content, and in vitro stability. The antioxidant activity of the GNPs was also determined by 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) cation (ABTS) radical-scavenging assays. Stable clones of neuronal SH-SY5Y-CFP-DEVD-YFP were generated and characterized, and cell viability after treatment with EGCG-GNPs was assessed after 72 hours through a 3(4,5-dimethylthiazol-2yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium assay. Activation of the apoptotic pathways was also investigated by Western blot analysis. Results With a diameter in the size range of 10–25 nm, the obtained nanoparticles (NPs) were found to contain 2.71%, 3.23%, and 5.47% of EGCG, RSV, and FS, respectively. Nanoprototypes exhibited remarkable in vitro stability in various media, suggesting that NP surface coating with phytochemicals prevents aggregation in different simulated physiological conditions. The scavenging activities for DPPH and ABTS were highly correlated with EGCG, RSV, and FS content. Moreover, high correlation coefficients between the ABTS and DPPH values were found for the prepared nanosystems. EGCG-GNPs induce a dose-dependent reduction on SH-SY5Y-CFP-DEVD-YFP cell viability that is likely to involve the activation of the apoptotic pathways, similarly to free EGCG, as suggested by the processing of the CFP-DEVD-YFP reporter. Conclusion These results prompted us to propose the ecofriendly synthesized EGCG-, RSV-, and FS-based nanogold conjugates as suitable carriers for bioactive polyphenols to be used for the treatment of disorders associated with oxidative stress, including neurodegenerative disorders, cardiovascular disease, and cancer.

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“…The results were coordinated with AuNPs reduction and stabilization by EGCG. 24 Moreover, deconvolution of C1s and O1s spectrum were shown in Fig. 4.…”

Section: Preparation Of Polyphenol-gelatin Nanoparticlesmentioning

confidence: 99%

Polyphenol–gelatin nanoparticles as reductant and stabilizer for one-step synthesis of gold nanoparticles and their interfacial behavior

Jin

et al. 2015

RSC Adv.

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A facile method for the one-step synthesis of gold nanoparticles (AuNPs) supported on tannic acid (TA) and gelatin self-assembled nanoparticles at room temperature was proposed. Tannic acid, a kind of polyphenol extracted from plants, could be self-assembled into nanoparticles with gelatin by strong hydrophobic interactions. This self-assembly nanoparticle acted as a reductant and stabilizer and was shown to be a good nano reactor for in situ synthesis of AuNPs. The stabilized AuNPs were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Fourier transforminfrared Spectroscopy (FTIR). The average size of the AuNPs was about 10 nm with a spherical shape.The reduction process of AuNPs was accompanied by the oxidation of polyphenol hydroxyl groups. Surprisingly, we found the oil-water interfacial behavior of polyphenol/gelatin nanoparticles had significant changes after AuNPs synthesis on the surface. Dynamic interfacial rheology tests revealed that AuNPs decreased the interfacial tension and enhanced the moduli of surface dilatational.

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Polyphenol-grafted collagen fiber as reductant and stabilizer for one-step synthesis of size-controlled gold nanoparticles and their catalytic application to 4-nitrophenol reduction

Cited by 171 publications

References 72 publications

Catalytic Applications of Carbon Dots

Catalytic Applications of Carbon Dots

Single-step green synthesis and characterization of gold-conjugated polyphenol nanoparticles with antioxidant and biological activities

Polyphenol–gelatin nanoparticles as reductant and stabilizer for one-step synthesis of gold nanoparticles and their interfacial behavior

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Polyphenol-grafted collagen fiber as reductant and stabilizer for one-step synthesis of size-controlled gold nanoparticles and their catalytic application to 4-nitrophenol reduction

Cited by 171 publications

References 72 publications

Catalytic Applications of Carbon Dots

Catalytic Applications of Carbon Dots

Single-step green synthesis and characterization of gold-conjugated polyphenol nanoparticles with&nbsp;antioxidant&nbsp;and biological activities

Polyphenol–gelatin nanoparticles as reductant and stabilizer for one-step synthesis of gold nanoparticles and their interfacial behavior

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Single-step green synthesis and characterization of gold-conjugated polyphenol nanoparticles with antioxidant and biological activities