Enhanced stability of antimicrobial bamboo fiber by launching ultra fine silver particles in a sodium dodecyl sulfate microemulsion system

2016 ◽  
Vol 87 (20) ◽  
pp. 2505-2512 ◽  
Author(s):  
Guanghui Qin ◽  
Jian Liu ◽  
Yong Xue ◽  
Jiajia Ding ◽  
Naizhong Huang ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Sodium Dodecyl ◽  
Reaction System ◽  
Reactive Oxygen ◽  
Aqueous System ◽  
Nano Particles ◽  
Microemulsion System ◽  
Oxygen Species ◽  
Silver Particles ◽  
Ag Particles

Currently, the antimicrobial textile market is emerging and has rapidly developed to meet the inherent demands placed on public hygiene. Silver (Ag) is an efficient antimicrobial due to its direct function with the cellular membrane of probe samples. The application of Ag in the textile industry is limited due to its poor stability in repeatedly washing. In this study we synthesized a kind of novel antibacterial fiber containing nano-size silver particles in a reversed emulsion reaction system. The Ag nano-particles are incorporated onto the bamboo fibers solidly through primitive oxidation by sodium periodate. The identification, dependent on Staphylococcus aureus, was implemented to check the influence of the reaction conditions on the antimicrobial property. Meanwhile, reactive oxygen species and the leakage of cytoplasmic contents were focused on investigating the antimicrobial mechanism. The antimicrobial assay suggested that samples from inversed micelle and aqueous system own the comparative antibacterial activity. However, samples from an emulsion system could maintain a better bactericidal property than samples from an aqueous system. Meanwhile, the reactive oxygen species and ultraviolet absorption show the same trend consistent with the antibacterial result. This result might be explained by the morphology and size of Ag particles attached on cellulose surface, which was proved by scanning electron microscopy and energy dispersive spectroscopy. It was revealed that the surface-to-volume ratio of Ag particles played a more crucial role in achieving higher antimicrobial activity than the mass. This approach will provide a practical solution for the synthesis of wash-durable antimicrobial substances.

Fenton-like reaction system with an analyte-activated catfish effect for enhanced colorimetric and photothermal dopamine bioassay

The Analyst ◽  
2020 ◽  
Author(s):  
Zhengrong Niu ◽  
Hong-Hong Rao ◽  
Xin Xue ◽  
Mingyue Luo ◽  
Xiuhui Liu ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Advanced Oxidation Processes ◽  
Reaction System ◽  
Reactive Oxygen ◽  
Advanced Oxidation ◽  
Oxygen Species ◽  
Reaction Systems ◽  
Oxidation Processes

Fenton-like reaction systems have been proven to be more efficient as the powerful promoters in advanced oxidation processes (AOPs) due to their resultantly generated reactive oxygen species (ROS) such as...

Photoreactivity of graphene oxide in aqueous system: Reactive oxygen species formation and bisphenol A degradation

Chemosphere ◽  
2018 ◽  
Vol 195 ◽  
pp. 344-350 ◽  
Author(s):  
Adeyemi S. Adeleye ◽  
Xinzhe Wang ◽  
Fanglu Wang ◽  
Rongjie Hao ◽  
Weihua Song ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Graphene Oxide ◽  
Bisphenol A ◽  
Reactive Oxygen ◽  
Aqueous System ◽  
Oxygen Species ◽  
Reactive Oxygen Species Formation ◽  
Species Formation

Effects of reactive oxygen species on cultured rat mesangial cells and isolated rat glomeruli

1992 ◽  
Vol 263 (3) ◽  
pp. F466-F473 ◽  
Author(s):  
I. Duque ◽  
C. Garcia-Escribano ◽  
M. Rodriguez-Puyol ◽  
M. L. Diez-Marques ◽  
J. M. Lopez-Novoa ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Surface Area ◽  
Mesangial Cells ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Reactive Oxygen ◽  
Acetate Incorporation ◽  
Dependent Manner ◽  
Oxygen Species ◽  
Mlc Phosphorylation

The effects of reactive oxygen species (ROS) on cultured rat mesangial cells were studied by measuring planar cell surface area (PCSA) after incubation with xanthine plus xanthine oxidase (XXO), in the presence of superoxide dismutase (SOD; 5 micrograms/ml) or catalase (CAT; 20 micrograms/ml), or after incubation with H2O2. Myosin light chain (MLC) phosphorylation was assessed in cells prelabeled with o-[32P]phosphoric acid and incubated with H2O2, after protein separation with sodium dodecyl sulfate-polyacrylamide gel electrophoresis. A possible intermediate role for platelet-activating factor (PAF) was analyzed by preincubation of the cells with a PAF antagonist BN 52021 (BN, 5 x 10(-5) M) and by measuring PAF-specific [3H]acetate incorporation and immunoassayable PAF. XXO significantly decreased PCSA (14%), an effect abolished by CAT but not by SOD. H2O2 induced a similar effect, in a dose-dependent and time-dependent manner. MLC phosphorylation increased by 81 +/- 15% after H2O2 incubation, and this effect was blocked by BN. BN also completely blocked the effect of H2O2 on PCSA. PAF-specific [3H]acetate incorporation increased in the presence of H2O2 (from 6,886 +/- 2,030 to 58,703 +/- 16,063 counts.min-1.mg-1) as well as the immunoassayable PAF production by cells (from 0.90 +/- 0.19 to 6.71 +/- 2.27 ng/mg). These results suggest that ROS, particularly H2O2, could modulate the surface area of mesangial cells, modifying the ultrafiltration coefficient, thus explaining the decrease in glomerular filtration rate in those pathological situations characterized by an increased ROS synthesis. PAF could be involved in the genesis of these effects.

scholarly journals A Host-Selective Toxin of Pyrenophora tritici-repentis, Ptr ToxA, Induces Photosystem Changes and Reactive Oxygen Species Accumulation in Sensitive Wheat

2009 ◽  
Vol 22 (6) ◽  
pp. 665-676 ◽  
Author(s):  
Viola A. Manning ◽  
Ashley L. Chu ◽  
Joshua E. Steeves ◽  
Thomas J. Wolpert ◽  
Lynda M. Ciuffetti
Keyword(s):  
Reactive Oxygen Species ◽  
Gel Electrophoresis ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Pyrenophora Tritici Repentis ◽  
Ptr Toxa ◽  
Ros Accumulation ◽  
Microscopic Evaluation

Ptr ToxA (ToxA) is a proteinaceous necrotizing host-selective toxin produced by Pyrenophora tritici-repentis, a fungal pathogen of wheat (Triticum aestivum). In this study, we have found that treatment of ToxA-sensitive wheat leaves with ToxA leads to a light-dependent accumulation of reactive oxygen species (ROS) that correlates with the onset of necrosis. Furthermore, the accumulation of ROS and necrosis could be inhibited by the antioxidant N-acetyl cysteine, providing further evidence that ROS production is required for necrosis. Microscopic evaluation of ToxA-treated whole-leaf tissue indicated that ROS accumulation occurs in the chloroplasts. Analysis of total protein extracts from ToxA-treated leaves showed a light-dependent reduction of the chloroplast protein RuBisCo. In addition, Blue native-gel electrophoresis followed by sodium dodecyl sulfate polyacrylamide gel electrophoresis analysis revealed that ToxA induces changes in photosystem I (PSI) and photosystem II (PSII) in the absence of light, and therefore, the absence of ROS. When ToxA-treated leaves were exposed to light, all proteins in both PSI and PSII were extremely reduced. We propose that ToxA induces alterations in PSI and PSII affecting photosynthetic electron transport, which subsequently leads to ROS accumulation and cell death when plants are exposed to light.

Production and decomposition dynamics of hydrogen peroxide in freshwater

2007 ◽  
Vol 4 (1) ◽  
pp. 49 ◽  
Author(s):  
Luc E. Richard ◽  
Barrie M. Peake ◽  
Steven A. Rusak ◽  
William J. Cooper ◽  
David J. Burritt
Keyword(s):  
Reactive Oxygen Species ◽  
Hydrogen Peroxide ◽  
Natural Waters ◽  
Formation Rate ◽  
Reaction System ◽  
Reactive Oxygen ◽  
Photochemical Reactions ◽  
Oxygen Species ◽  
Decay Rate Constant ◽  
H2o2 Decomposition

Environmental context. Hydrogen peroxide (H2O2) is the most stable reactive oxygen species (ROS) formed through irradiation of chromophoric dissolved organic matter (CDOM) in freshwater. It can act as a reductant or as an oxidant and decays largely through interaction with microorganisms via unknown mechanisms. In this way it can affect biological and chemical processes in natural waters and thus shape the ecosystem biogeochemistry. Abstract. Hydrogen peroxide (H2O2) is widely recognised as the most stable of the reactive oxygen species produced by solar radiation-driven photochemical reactions in natural waters. H2O2 concentrations were determined in a shallow fresh water system (water of Leith, Dunedin, New Zealand) by flow-injection analysis (FIA) using an acridinium ester chemiluminescent reaction system. Daytime measurements of H2O2 concentration showed a rapid increase from early morning (15 nM) to 1300 hours (491 nM), consistent with photochemical formation, lagging maximum solar irradiance by ~1.5 h. The wavelength dependency of H2O2 formation was studied and it was shown that UV-B, UV-A and PAR contributed 40, 33 and 27%, respectively. The average formation rate was 339 nM h–1 during springtime. The influence of biotic communities on the rate of H2O2 decomposition was also studied and the majority of decomposition was due to particles smaller than 0.22 μm. The overall first order decay rate constant was of the order of 7.1 h–1. The bacterial and algal communities in the water column and on the riverbed were primarily responsible for the decomposition of H2O2.

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