Cyclodextrin encapsulated monometallic and inverted core–shell bimetallic nanoparticles as efficient free radical scavengers

Bhoi, Vinod I.; Kumar, Santosh; Murthy, C. N.

doi:10.1039/c5nj02511g

Cited by 22 publications

(13 citation statements)

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“…Aiming to achieve improved RA having multiple hydroxyls as an active reducing site and biocompatible in nature, we choose cyclic sugars particularly β‐cyclodextrin (CD), which comprises 7 primary and 14 secondary hydroxyls groups active for reducing Cu(II) under solvent . The unique class of cyclic oligosaccharides CDs that show different physical and chemical properties have been reviewed thoroughly, and among them β‐CD forms inclusion complexes with diverse applications in pharmaceuticals as stabilizing agent, capping agent, and as catalyst promoters in organic synthesis .…”

Section: Introductionmentioning

confidence: 99%

“…Similar to reducing monosaccharides like glucose, β‐CD copolymer has also been reported for the synthesis of Ag nanoparticles (NPs) . We recently showed the reducing property of β‐CD for the formation of not only Ag and Au NPs but also for inverted core–shell bimetallic NPs (Ag@Au and Au@Ag) in the aqueous medium . With this background and to further prove its reducing character, we report the use of β‐CD as an RA for Cu(II)/ N,N,N ′, N ″, N ″‐pentamethyldiethylenetriamine (PMDETA) complex in copper‐mediated ARGET‐ATRP of MMA on difunctional polystyrene macroinitiator (PS‐MI) for poly(MMA) (PMMA)‐ b ‐PS‐ b ‐PMMA triblock copolymerization (Scheme ).…”

Section: Introductionmentioning

confidence: 99%

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ARGET‐ATRP using β‐CD as reducing agent for the synthesis of PMMA‐b‐PS‐b‐PMMA triblock copolymers

Karkare

Kumar

Murthy

2018

J of Applied Polymer Sci

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We studied the role of β-cyclodextrin (CD), a polyhydroxy cyclic sugar as reducing agent (RA) for the copper mediated activators regenerated by electron transfer atom transfer radical polymerization (ATRP) with the successful chain extension of methyl methacrylate blocks on the bifunctional polystyrene macroinitiator (PS-MI) using nonaqueous solvent system for the first time. The PS-MI was prepared by ATRP, had a polydispersity of 1.05 and gave triblock copolymers in the presence of β-CD. We found that alcoholic groups of β-CD show provisional reducing character and in situ convert Cu(II) to Cu(I) during polymerization. A well-defined triblock copolymer with narrow molecular weight distribution (polydispersity index < 1.5) was obtained at 100 C. The molecular weight of the block copolymers increased linearly with monomer conversion and the reaction showed good control over the molecular weights when compared to the theoretical values. We show that the mild reducing power of β-CD is retained in a nonaqueous solvent also and is efficient with catalyst/RA ratio of 1:0.5. The effect of temperature on the reducing competency of β-CD was evaluated and found to be active at around 80 C even though its melting temperature is 290 C.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

ARGET‐ATRP using β‐CD as reducing agent for the synthesis of PMMA‐b‐PS‐b‐PMMA triblock copolymers

Karkare

Kumar

Murthy

2018

J of Applied Polymer Sci

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“…Also, they can reduce the cytotoxicity of noble metal nanoparticles [42]. Recently, one-step synthesis of macrocyclic supramolecules capped noble metal nanoparticles with good monodispersity have been demonstrated, indicating that the synthesis and the surface functionalization can be realized in one simple process [43][44][45][46][47][48][49][50]. However, the LSPR biosensing potential of macrocyclic supramolecules modified noble metal nanoparticles has not been comprehensively studied.…”

Section: List Of Abbreviationsmentioning

confidence: 99%

“…The stability of the host-guest interaction is largely dependent on the cavity size. For instance, the cavity of -CD most tightly fits with the sterol group(Figure 2-27 (b)), making -CD a highly efficient cholesterol receptor in many biomedical applications[224,225].Compared with functionalizing the macrocyclic supramolecules to noble metal nanoparticles surface via post-processing surface modification, capping the nanoparticles with supramolecules during the synthesis would be much more efficient.Several studies have been carried out to realize macrocyclic supramolecules modified noble metal nanoparticles in one-step synthesis[43][44][45][46][47][48][49][50]. These synthesis methods are similar to the Turkevich method as explained in Section 2.3.3, except that supramolecules are added instead of sodium citrate as the capping agent.…”

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Highly integrated biosensors based on fiber optics

Zhang¹

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Benefited from the advantages of flexibility, miniaturization, immunity to electromagnetic interference and compatibility with today's well-developed optical fiber based telecommunication system, fiber-optic sensors show huge potentials with the increasing demand of comprehensive perception in every aspect of life. Especially in the practices of biosensing, optical fibers are prevailing platforms for highlysensitive, real-time, label-free and in vivo detection due to their high degree of integration, dielectric nature, non-toxicity and chemical inertness. In this thesis, we investigate several approaches focusing on the proper design of optical fiber structure and the efficient integrations with functional materials to enhance the effectiveness of light-matter interaction and the reliability of biosensing output. Firstly, we develop a highly sensitive magnetic field sensor based on magneticfluid-coated long period fiber grating (LPG). The emergence of optomagnetic biosensors in recent years brings the needs of all-optical, integrated and flexible magnetic field sensors. Benefited from the acute response of LPG to ambient medium and the remarkable magneto-optic properties of magnetic fluid, our proposed magnetic field sensor provides a superior sensitivity of 0.154 dB/Gauss. Secondly, we investigate the possibility of improving conventional fiber-optic plasmonic biosensors by employing a graphene/gold hybrid plasmonic structure. Introducing a graphene layer not only strengthens the surface plasmons but also acts as an excellent replacement of surface functionalization. We construct a biosensor that integrates such hybrid plasmonic architecture with a side-polished optical fiber and achieves a limit of detection (LOD) of ssDNA as low as 1 pM. Thirdly, we explore the potentials of adopting transition metal oxides as an alternative class of plasmonic 2D materials for biosensing in well-developed visible and near-infrared (NIR) optical windows, since plasmonics of common 2D materials locate intrinsically at mid-infrared range. Here we demonstrate the feasibility of integrating heavily-doped 2D MoO3 with fiber-optic platform and achieving strong surface plasmons in NIR range, which facilities low LOD of biomolecules. Fourthly, we realize one-step green synthesis of -cyclodextrin (-CD) capped gold nanoparticles. The macrocyclic supramolecular -CD serves as

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Metal Nanoparticles and Cyclodextrins for Catalytic Applications

Noël

Ponchel

Sadjadi

et al. 2020

Environmental Chemistry for a Sustainable World

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Cyclodextrin encapsulated monometallic and inverted core–shell bimetallic nanoparticles as efficient free radical scavengers

Abstract: A facile and green route for monometallic and core–shell bimetallic Ag and Au nanoparticles using cyclodextrin as reducing and stabilizing agent for radical scavenging.

Cited by 22 publications

References 62 publications

ARGET‐ATRP using β‐CD as reducing agent for the synthesis of PMMA‐b‐PS‐b‐PMMA triblock copolymers

ARGET‐ATRP using β‐CD as reducing agent for the synthesis of PMMA‐b‐PS‐b‐PMMA triblock copolymers

Highly integrated biosensors based on fiber optics

Metal Nanoparticles and Cyclodextrins for Catalytic Applications

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