Ti-based porous materials for reactive oxygen species mediated photocatalytic reactions

2022 ◽  
Author(s):  
Seonghun Park ◽  
Yesub Keum ◽  
Jinhee Park
Keyword(s):  
Reactive Oxygen Species ◽  
Porous Materials ◽  
Uv Light ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Semiconducting Materials ◽  
Photocatalytic Reactions ◽  
Reactive Oxidants

Reactive oxygen species (ROS) are highly reactive oxidants that are typically generated by the irradiation of semiconducting materials with visible or UV light and are widely used for the photocatalytic...

Ultraviolet irradiation-mediated formation of Aβ42 oligomers and reactive oxygen species in Zn2+-bound Aβ42 aggregates irrespective of the removal of Zn2+

2016 ◽  
Vol 40 (11) ◽  
pp. 9385-9394 ◽  
Author(s):  
Xiang Li ◽  
Xiongwei Dong ◽  
Yaojing Liu ◽  
Yan Meng ◽  
Yong Zhang ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Ultraviolet Irradiation ◽  
Uv Light ◽  
Light Exposure ◽  
Reactive Oxygen ◽  
Oxygen Species

The controlled UV light exposure converts redox-inert Zn2+-bound Aβ42 aggregates into cytotoxic Aβ42 oligomers and reactive oxygen species.

Photoactivation of core–shell titania coated upconversion nanoparticles and their effect on cell death

2014 ◽  
Vol 2 (40) ◽  
pp. 7017-7026 ◽  
Author(s):  
Niagara Muhammad Idris ◽  
Sasidharan Swarnalatha Lucky ◽  
Zhengquan Li ◽  
Kai Huang ◽  
Yong Zhang
Keyword(s):  
Reactive Oxygen Species ◽  
Cell Death ◽  
Uv Light ◽  
Reactive Oxygen ◽  
Upconversion Nanoparticles ◽  
Core Shell ◽  
Oxygen Species

Titania-coated upconversion nanoparticles convert 980 nm to UV light for activation of coated titania to generate reactive oxygen species against cells.

Insights into the Effect of Reactive Oxygen Species Regulation on Photocatalytic Performance via Construction of a Metal-Semiconductor Heterojunction

2020 ◽  
Vol 20 (6) ◽  
pp. 3478-3485 ◽  
Author(s):  
Jun Shen ◽  
Zhi-Jun Li ◽  
Ze-Feng Hang ◽  
Su-Fan Xu ◽  
Qin-Qin Liu ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Dye Degradation ◽  
Reactive Oxygen ◽  
Degradation Process ◽  
Oxygen Species ◽  
Paramagnetic Resonance ◽  
Electron Transfer Pathway ◽  
Spin Resonance ◽  
Photocatalytic Reactions ◽  
Electron Paramagnetic

Reactive oxygen species (ROS), as primary intermediates formed during photocatalytic reactions, are critical for a photocatalyst to realize high activity. The major objective of this study was to investigate the regulation of ROS involved in the photocatalytic degradation process via constructing a typical metal-semiconductor hybrid heterojunction using Ag nanoparticles/anatase TiO2 as an example. Based on radical capturing, electron paramagnetic resonance, and electron spin resonance experiments, an increase in the available ROS can be achieved in the Ag/TiO2 heterojunction due to the fast separation of photogenerated carriers. In addition, due to the change in the electron transfer pathway, superoxide radicals (·O−2) are the dominant reactive species responsible for dye degradation using Ag/TiO2 rather than hydroxyl radicals (·OH) as the main free radicals in pristine TiO2. This study offers fresh insight into the regulation of ROS in photodegradation via the construction of a Ag/TiO2 heterojunction.

scholarly journals Pyrolytic formation and photoactivity of reactive oxygen species in a SiO2/carbon nanocomposite from kraft lignin

F1000Research ◽  
2018 ◽  
Vol 7 ◽  
pp. 1574 ◽  
Author(s):  
Dhanalakshmi Vadivel ◽  
Ilanchelian Malaichamy
Keyword(s):  
Reactive Oxygen Species ◽  
Uv Light ◽  
Atmospheric Oxygen ◽  
Reactive Oxygen ◽  
Kraft Lignin ◽  
Peroxyl Radicals ◽  
Ros Generation ◽  
Oxygen Species ◽  
Oxygenated Functional Groups ◽  
Carbon Nanocomposite

SiO2 and carbon produced by kraft lignin pyrolyzed at 600°C can generate stable reactive oxygen species (ROS) by reaction with atmospheric oxygen. In this study, we systematically investigate the photochemistry of peroxyl radicals in carbon-supported silica (PCS) and assess its effects on the methylene blue (MB) photodegradation. Characterization revealed that the higher ROS generation ability of SiO2/carbon under UV light irradiation was attributed to its abundant photoactive surface-oxygenated functional groups.

Apoptosis development pathways in human lymphocytes induced by UV light and reactive oxygen species

BIOPHYSICS ◽  
2011 ◽  
Vol 56 (6) ◽  
pp. 1110-1126
Author(s):  
V. G. Artyukhov ◽  
M. S. Trubitsina ◽  
M. A. Nakvasina ◽  
E. V. Solov’eva ◽  
O. V. Lidokhova
Keyword(s):  
Reactive Oxygen Species ◽  
Uv Light ◽  
Human Lymphocytes ◽  
Reactive Oxygen ◽  
Oxygen Species

scholarly journals Role for Nucleotide Excision Repair in Virulence of Mycobacterium tuberculosis

2005 ◽  
Vol 73 (8) ◽  
pp. 4581-4587 ◽  
Author(s):  
K. Heran Darwin ◽  
Carl F. Nathan
Keyword(s):  
Nitric Oxide ◽  
Reactive Oxygen Species ◽  
Mycobacterium Tuberculosis ◽  
Excision Repair ◽  
Uv Light ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Phagocyte Oxidase ◽  
Nitric Oxide Synthase 2

ABSTRACT Mutations in Mycobacterium tuberculosis uvrB result in severe sensitivity to acidified nitrite, a source of nitric oxide (6). In this study, we show that a uvrB mutant is exquisitely sensitive to UV light but not to several sources of reactive oxygen species in vitro. Furthermore, a uvrB mutant was attenuated in mice as judged by an extension of life span. Attenuation in mice was partially reversed by genetic inactivation of nitric oxide synthase 2 (iNOS) and almost completely reversed in mice lacking both iNOS and phagocyte oxidase. Thus, a gene predicted to encode a key element of DNA repair is required for resistance of M. tuberculosis to both reactive nitrogen and reactive oxygen species in mice.

scholarly journals Comparison Study of Cytotoxicity of Bare and Functionalized Zinc Oxide Nanoparticles

2021 ◽  
Vol 22 (17) ◽  
pp. 9529
Author(s):  
Anna Król-Górniak ◽  
Katarzyna Rafińska ◽  
Fernanda Monedeiro ◽  
Paweł Pomastowski ◽  
Bogusław Buszewski
Keyword(s):  
Reactive Oxygen Species ◽  
Methylene Blue ◽  
Zinc Oxide ◽  
Cell Lines ◽  
Zinc Oxide Nanoparticles ◽  
Uv Light ◽  
Reactive Oxygen ◽  
Oxide Nanoparticles ◽  
Oxygen Species ◽  
Zno Nps

In this paper, a study of the cytotoxicity of bare and functionalized zinc oxide nanoparticles (ZnO NPs) is presented. The functionalized ZnO NPs were obtained by various types of biological methods including microbiological (intra- and extracellular with Lactobacillus paracasei strain), phytochemical (Medicago sativa plant extract) and biochemical (ovalbumin from egg white protein) synthesis. As a control, the bare ZnO NPs gained by chemical synthesis (commercially available) were tested. The cytotoxicity was measured through the use of (3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) dye as well as lactate dehydrogenase (LDH) assays against murine fibroblast L929 and Caco-2 cell lines. As a complementary method, scanning electron microscopy (SEM) was performed to assess the morphology of the tested cells after treatment with ZnO NPs. The microscopic data confirmed the occurrence of apoptotic blebbing and loss of membrane permeability after the administration of all ZnO NPs. The reactive oxygen species (ROS) concentration during the cell lines’ exposure to ZnO NPs was measured fluorometrically. Additionally, the photocatalytic degradation of methylene blue (MB) dye in the different light conditions, as well as the antioxidant activity of bare and functionalized ZnO NPs, is also reported. The addition of all types of tested ZnO NPs to methylene blue resulted in enhanced rates of photo-degradation in the presence of both types of irradiation, but the application of UV light resulted in higher photocatalytic activity of ZnO NPs. Furthermore, bare (chemically synthetized) NPs have been recognized as the strongest photocatalysts. In the context of the obtained results, a mechanism underlying the toxicity of bio-ZnO NPs, including (a) the generation of reactive oxygen species and (b) the induction of apoptosis, is proposed.

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