Free radical nano scavenger based on amphiphilic novolacs

Wang, Yue; Zhang, Qian; Xie, Chao; Zhao, Xin; Niu, Jinfen; Zhao, Jie; Oh, Jung Kwon; Li, Pengfei

doi:10.1039/c5ra20440b

Cited by 5 publications

(2 citation statements)

References 63 publications

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“…When the strained double bond was used from maleimide instead of norbornene, the signal shifted further to 5.03 and 5.94 ppm . The evidence of formation of triazoline can also be confirmed by the methylene on the alkyl chain next to nitrogen, as found centered at 3.53 ppm in Figure with integration values doubled compared to the CH at 4.36–4.50 ppm (on triazoline ring), which is in agreement very well with the similar example with butyl substituent (3.53 ppm) by Banert et al It has to be mentioned that the protons on methylene adjacent to azide in NC13N 3 were overlapped with peaks from 1.5 to 2.0 ppm . So, the presence of azide has to be confirmed by FTIR with the vibration at 2099 cm −1 compared to NC11Br (Figure ).…”

Section: Resultssupporting

confidence: 88%

Polyaddition of Azide‐Containing Norbornene‐Based Monomer through Strain‐Promoted 1,3‐Dipolar Cycloaddition Reaction

Zhang

et al. 2016

Macromol. Rapid Commun.

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The azide-alkyne "click" reaction has been well known in the past decade, however, another kind of 1,3-dipolar cycloaddition, the azide-alkene reaction is not fully explored in polymer science to date. This contribution reports, for the first time, the discovery of a polyaddition of norbornene based monomer (NC11N3 ) containing both strained double bond and azide moieties. The reaction product is characterized by Fourier transform infrared spectroscopy (FTIR), NMR, gel permeation chromatography (GPC), and mass spectrometry (MS), which confirmed the mechanism that is through cycloaddition of azide to strained double bond on norbornene ring to form triazoline linkage. The reaction can proceed at room temperature as indicated by the increase of molecular weight and viscosity during storage. Monomer, dimer, trimer, tetramer, etc., and species with loss of N2 due to lability of triazoline moiety are identified in the mixture of reaction product. As a unique feature, elimination of N2 in the five-membered ring of triazoline affords a chance to form highly reactive materials, such as with aziridine, which can be a very powerful tool in chemical functionalizations, and find promising applications in reactive polymer resin industries.

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Section: Resultssupporting

confidence: 88%

Polyaddition of Azide‐Containing Norbornene‐Based Monomer through Strain‐Promoted 1,3‐Dipolar Cycloaddition Reaction

Zhang

et al. 2016

Macromol. Rapid Commun.

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“…Hydrogen peroxide scavenging (H2O2) efficacy of the test reaction mixtures was ascertained from the literature procedure [45]. The solution of H2O2 (40mM) prepared in phosphate buffer (pH7.4) was added to various concentrations of (25, 50, 75, and 100 µg/ml) the test compounds (like plant extract and WT-AgNPs).…”

Section: H2o2 Scavenging Activitymentioning

confidence: 99%

Bio-fabrication of Silver Nanoparticles from Walsura trifoliata (A. Juss.) Harms Characterization, Antibacterial, and Anti-oxidant Efficacy

Subbaiah¹,

Ankanna²,

Savithramma³

2022

Int J Pharm Phytopharmacol Res

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Green synthesis of silver nanoparticles (AgNPs) was achieved by the bio-reduction of silver nitrate using Walsura trifoliata plant aqueous leaf extract. The AgNPs are characterized by UV-Vis, FT-IR, and TEM. The AgNPs formation was preliminarily confirmed by Ultraviolet-Visible (UV-Vis) spectrophotometer. The synthesized AgNPs in the solution has shown a lesser absorption at 434nm. The Fourier-Transform Infrared (FTIR) Spectroscopy was used to validate the presence of several functional groups responsible for decreasing and stabilizing during the biosynthesis process. The TEM is used to know the morphology, size, and agglomeration pattern of the nanoparticles. The characterization of silver nanoparticles revealed a spherical crystallite nature with particle sizes ranging between 21.08-24.91nm, the average size of the nanoparticles 22.48nm. The synthesized AgNPs showed remarkable antimicrobial activity against clinically isolated two Gram-negative bacteria (K. pneumoniae and E.coli) and two Gram-positive bacteria (B. subtilis and S. aureus); and antioxidant (2, 2-diphenyl-1-picryl-hydrazyl (DPPH), H2O2 and NO radical scavenging activities.

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Microbial Degradation of Plastics: New Plastic Degraders, Mixed Cultures and Engineering Strategies

Jenkins

Quer

Fonseca

et al. 2019

Soil Microenvironment for Bioremediation and Polymer Production

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Free radical nano scavenger based on amphiphilic novolacs

Abstract: Synthetic amphiphilic novolacs via click chemistry are capable of forming micelles, and interestingly, can act as highly efficient nano-scavengers for hydroxyl free radicals.

Cited by 5 publications

References 63 publications

Polyaddition of Azide‐Containing Norbornene‐Based Monomer through Strain‐Promoted 1,3‐Dipolar Cycloaddition Reaction

Polyaddition of Azide‐Containing Norbornene‐Based Monomer through Strain‐Promoted 1,3‐Dipolar Cycloaddition Reaction

Bio-fabrication of Silver Nanoparticles from Walsura trifoliata (A. Juss.) Harms Characterization, Antibacterial, and Anti-oxidant Efficacy

Microbial Degradation of Plastics: New Plastic Degraders, Mixed Cultures and Engineering Strategies

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