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Search for "free radical" in Full Text gives 34 result(s) in Beilstein Journal of Nanotechnology.
Interaction of dermatologically relevant nanoparticles with skin cells and skin
Beilstein J. Nanotechnol. 2014, 5, 2363–2373, doi:10.3762/bjnano.5.245
- cellular uptake, including optical microscopy, electron microscopy, X-ray microscopy on cells and tissue sections, flow cytometry of isolated skin cells as well as Raman microscopy on whole tissue blocks. In order to assess the biological relevance of such findings, cell viability and free radical
- ), which correlates with what has been shown in literature [45]. The data were correlated with the production of IL-6. UV-radiation- and nanoparticle-induced intracellular free radical generation were measured in human keratinocytes by EPR spectroscopy [45]. This illustrated that EPR is able to measure UVB
- in EPR signal, no ROS could be detected after particle application alone. A lack of particle penetration with rather superficial radical production in response to UVB exposure could be an explanation. Similarly, no free radical production was detected in skin treated with silver nanoparticles (Figure
Nanobioarchitectures based on chlorophyll photopigment, artificial lipid bilayers and carbon nanotubes
Beilstein J. Nanotechnol. 2014, 5, 2316–2325, doi:10.3762/bjnano.5.240
- oxidative stress. Luminol was introduced as light amplifier in this system in order to increase the detection sensitivity of activated oxygen species. The antioxidant activity (AA, %) was calculated as a percentage of free radical scavenging of each sample using: where I0 is the maximum CL intensity for a
- mainly due to the presence of carbon nanotubes. Although the study of the free-radical scavenging properties of CNTs is an emerging area of nanotechnology, only a few research papers have reported the antioxidant nature of SWCNTs [42][43]. According to some reports [44][45], the free radical scavenger
- were shown to be more stable (ZP = −36.4 mV) and to be the most potent, free radical scavengers, possessing an antioxidant activity value of 73.25%. In addition, the cholesterol-containing, carbon-based biohybrids were the most potent antibacterial materials, offering inhibition zones of 12.4, 11.3 and
Carbon nano-onions (multi-layer fullerenes): chemistry and applications
Beilstein J. Nanotechnol. 2014, 5, 1980–1998, doi:10.3762/bjnano.5.207
- (DBU) in o-dichlorobenzene (Scheme 4A). The second reaction studied was a free-radical addition, in which the CNOs were heated under reflux with benzoyl peroxide as radical source in toluene. Also this reaction could be accomplished only with N-CNOs, while the A-CNOs did not react. The obtained
PVP-coated, negatively charged silver nanoparticles: A multi-center study of their physicochemical characteristics, cell culture and in vivo experiments
Beilstein J. Nanotechnol. 2014, 5, 1944–1965, doi:10.3762/bjnano.5.205
Pyrite nanoparticles as a Fenton-like reagent for in situ remediation of organic pollutants
Beilstein J. Nanotechnol. 2014, 5, 855–864, doi:10.3762/bjnano.5.97
- , nearly all the generated H2O2 had been immediately transformed into less stable free radical species, in a process catalyzed by the Fe2+ ions released during their rapid dissolution. However, the microparticles gave vastly distinct results: the H2O2 was generated much more slowly, and gradually
- 7, below [33]. In this sequence, Equation 5 and Equation 6 are the slowest and diminish the recycling between Fe2+ and Fe3+. Consequently, they form the rate-limiting step in the generation of free radical species and decrease the efficiency of the oxidative degradation of contaminants. When pyrite
- : 0.1 μM) with a response time of less than 5 s. The signal was amplified with a picoamperemeter (Apollo 4000 Free Radical Analyzer, World Precision Instruments). Measurements were taken by using a polarization voltage of 0.4 V versus an Ag/AgCl reference electrode. Simultaneous to H2O2 generation, the
One pot synthesis of silver nanoparticles using a cyclodextrin containing polymer as reductant and stabilizer
Beilstein J. Nanotechnol. 2014, 5, 380–385, doi:10.3762/bjnano.5.44
- -cyclodextrin containing polymer 1 at room temperaure. The copolymer 1 was prepared from N-isopropylacrylamide and mono-(1H-triazolylmethyl)-2-methylacryl-β-cyclodextrin via free radical polymeraization (Scheme 1). The molar weight Mn = 2·103 g/mol was measured by aqueos SEC-MALS (D = 3.2). Through variation of
Porous polymer coatings as substrates for the formation of high-fidelity micropatterns by quill-like pens
Beilstein J. Nanotechnol. 2013, 4, 377–384, doi:10.3762/bjnano.4.44
- . Recently we introduced a method for the preparation of a porous biocompatible polymer coating on a solid substrate, using in situ free radical polymerization of methacrylate monomers in the presence of porogens [4]. Porous poly(2-hydroxyethyl methacrylate-co-ethylene dimethacrylate, HEMA) was shown to
Photocatalytic antibacterial performance of TiO2 and Ag-doped TiO2 against S. aureus. P. aeruginosa and E. coli
Beilstein J. Nanotechnol. 2013, 4, 345–351, doi:10.3762/bjnano.4.40
- blocking of respiration and cell death of the bacteria [10]. Another remarkable mechanism of the antimicrobial activity of Ag nanoparticles is related to the formation of free radicals and consequent free-radical-induced oxidative damage of the cell membranes of bacteria [11][12]. But the same result was
Surface functionalization of aluminosilicate nanotubes with organic molecules
Beilstein J. Nanotechnol. 2012, 3, 82–100, doi:10.3762/bjnano.3.10
- to free-radical polymerization [39]. Free-radical polymerization is preferable to ionic processes on economic grounds, because it is easier to perform and much less sensitive to the presence of water. Recently, we reported the grafting of poly(methyl methacrylate) (PMMA) on the imogolite surface, in
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