Journal of Materials Chemistry B
·
2017
·Vol. 5
·期 45
·8975-8982
·
IF 4.543
Qian Pang,Xiaowen Zheng,Yu Luo,Lie Ma,Changyou Gao
The development of antibiotic-loaded wound dressings is of great importance in wound healing and infection treatment. However, in traditional antibiotic-loaded wound dressings, antibiotics are released uncontrollably from the dressings primarily by passive diffusion. The overuse of antibiotics may lead to drug resistance and side effects, which could hinder the healing process. To overcome these shortcomings, a wound dressing with UV-responsive antibacterial property was developed in this study. Levofloxacin (LF) was first conjugated to amine-terminated poly(ethylene glycol) through a photolabile ortho-nitrobenzyl linker to obtain a photo-cleavable polyprodrug (LHP), which was then loaded into a poly(vinyl alcohol)/sodium alginate (PVA/SA) wound dressing. Compared to the PVA/SA dressing, the LHP-loaded dressing showed larger swelling capacity and retained good cytocompatibility. It was found that LF could be cleaved from LHP under UV irradiation at 365 nm and released gradually from the wound dressing with an increase in UV irradiation time. The antibacterial zone test proved that the LHP-loaded wound dressing possessed UV-responsive antibacterial properties against Staphylococcus aureus.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Ruobai Li,Jing Kong,Haijin Liu,Ping Chen,Yuehan Su,Guoguang Liu,Wenying Lv
The extensive production and use of non-steroidal anti-inflammatory drugs (NSAIDs) has increased the volume of downstream residues that contaminate the environment, which pose great threats to ecosystems and human health. The decomposition of peroxydisulfate (PDS), which is activated by UV–vis to produce a potent oxidizing sulfate radical, comprises a new type of advanced oxidation technology. The degradation of indomethacin (IM) by the UV–vis activation of peroxydisulfate was investigated. The results demonstrated that IM degradation followed pseudo-first-order reaction kinetics. UV–vis irradiation led to the direct albeit slight photolysis of IM, whereas the addition of an oxidant significantly enhanced the removal efficiency. The IM degradation efficiency was increased when the pH was elevated from 5 to 7; however, the elimination of IM was reduced when the pH was elevated from 7 to 9 due to the conversion of SO 4 − to HO . A low concentration of Cl − had a dual effect, while a high concentration led to a dramatic inhibitory effect. Fulvic acid (SRFA) inhibited the decomposition of IM through the light screening effect and the quenching of radicals. A quenching experiment revealed that SO 4 − was the primary free radical, which is confirmed by electron spin resonance spectroscopy. The second-order rate constants of IM and SO 4 − were also determined. The luminescent bacteria Vibrio fischeri was selected to assess the toxicity of the transformation products, which was further confirmed by quantitative structure-active relationship analysis. The cleavage of the bond between C on the benzene ring and N on the indole group, the hydroxylation of the benzene ring, and the decarboxylation of the aliphatic chain were the main pathways for the degradation of IM in the UV–vis/peroxydisulfate system.
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Marine Drugs
·
2024
·Vol. 22
·期 11
·499
·
IF 4.9
Biyang Zhu,Jiacheng Wang,Lijun You,Lianzhu Lin,Kuncheng Lin,Kseniya Hileuskaya
Calcium-chelated polysaccharides have been increasingly considered as promising calcium supplements. In this study, degraded fucoidans (DFs) with different molecular weights (Mws) were prepared after UV/H2O2treatment; their calcium-chelating capacities and intestinal absorption properties were also investigated. The results showed that the calcium-chelating capacities of DFs were improved with a decrease in Mw. This was mainly ascribed to the increased carboxyl content, which was caused by free-radical-mediated degradation. Meanwhile, the conformation of DF changed from a rod-like chain to a shorter and softer chain. The thermodynamic analysis demonstrated that DF binding to calcium was spontaneously driven by electrostatic interactions. Additionally, DF-Ca chelates with lower Mw showed favorable transport properties across a Caco-2 cell monolayer and could effectively accelerate the calcium influx through intestinal enterocytes. Furthermore, these chelates also exhibited a protective effect on the epithelial barrier by alleviating damage to tight junction proteins. These findings provide an effective free-radical-related approach for the development of polysaccharide-based calcium supplements with improved intestinal calcium transport ability.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2015
·Vol. 23
·期 3
·2848-2855
·
IF 2.828
Bu Lingjun,Zhou Shiqing,Shi Zhou,Deng Lin,Li Guangchao,Yi Qihang,Gao Naiyun
The degradation kinetics and mechanism of the antiepileptic drug oxcarbazepine (OXC) by UV-activated persulfate oxidation were investigated in this study. Results showed that UV/persulfate (UV/PS) process appeared to be more effective in degrading OXC than UV or PS alone. The OXC degradation exhibited a pseudo-first order kinetics pattern and the degradation rate constants ( k
obs ) were affected by initial OXC concentration, PS dosage, initial pH, and humic acid concentration to different degrees. It was found that low initial OXC concentration, high persulfate dosage, and initial pH enhanced the OXC degradation. Additionally, the presence of humic acid in the solution could greatly inhibit the degradation of OXC. Moreover, hydroxyl radical (OH•) and sulfate radical (SO 4
− ••) were identified to be responsible for OXC degradation and SO 4
− • made the predominant contribution in this study. Finally, major intermediate products were identified and a preliminary degradation pathway was proposed. Results demonstrated that UV/PS system is a potential technology to control the water pollution caused by emerging contaminants such as OXC.
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Analytical Methods
·
2015
·Vol. 7
·期 13
·5447-5453
·
IF 1.821
Haiqian Zhao,Jihui Gao,Wei Zhou,Zhonghua Wang,Shaohua Wu
The reason for the prominent error in the hydroxyl radical detection method by UV-vis spectrophotometry with fast blue BB salt (FBBs) as the chromogenic agent was detected, and a modified method was proposed. The simultaneous extraction of FBBs in the diazosulfone extraction process was proven to have a distinct influence on the test results. In the modified method, FeSO4 was adopted to limit the extraction of FBBs by a toluene/butanol extraction agent, which sharply decreased the influence of FBBs on diazosulfone detection. The FBBs amount and extraction time played an important role in its extraction. The appropriate FBBs/MSIA ratio was 50, and the reasonable extraction time was 300 s for the modified method. ˙OH concentration in the directional decomposition of the Fenton system was detected. The test error was about 7%. This method is quite significant to test ˙OH quantificationally to better understand Fenton reaction mechanisms and promote the generation of ˙OH.
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2017
·Vol. 55
·期 10
·1696-1705
·
IF 2.952
Bo Jiang,Tong Zhang,Liwei Zhao,Zhiming Xu,Yudong Huang
In this contribution, three polymerizable benzophenone photoinitiators containing maleimide group including 4-maleimidebenzophenone (MBP), 4-chlorine-4′-maleimide benzophenone (CMBP), and 4-maleimide-4′-[(4-maleimide)thiophenyl]benzophenone (MMTBP) were designed and synthesized to enhance the polymerization degree of photosensitive polysiloxane containing methacryloxy active groups (MAPSO). The polymerization behaviors of the MAPSO cured by different photoinitiators were investigated using Fourier transform infrared (FTIR). It was noted that the MAPSO initiated by MMTBP showed a high carbon–carbon double bond conversion above 80% because of the existence of thiophenyl group which could generate more radicals from the photolysis reaction at the C S bond. In addition, the thermal stability of the UV-cured MAPSO were studied by thermogravimetric analysis (TGA), the result showed that the initial 5% mass loss ( T 5% ) and residual weight percent at 800 °C in nitrogen of the UV-cured MAPSO initiated by MMTBP systems was 200 °C and 33.8%. Thus, this work provides a new perspective and efficient strategy to improve the polymerization degree of UV-curable polysiloxanes with carbon–carbon double bonds. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55 , 1696–1705
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JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Anan Wang,Ying Teng,Xuefeng Hu,Longhua Wu,Yujuan Huang,Yongming Luo,Peter Christie
Diphenylarsinic acid (DPAA) is a major contaminant in environments polluted by chemical weapons and abandoned after World Wars I and II and poses high risks to biota but remediation methods for this contaminant are rare. Here, the photodegradtion of DPAA was studied under high-pressure Hg lamp irradiation. DPAA was degraded completely into inorganic arsenic species in 30 min under UV-C irradiation. The photodegradation of DPAA depended mainly on its direct photolysis through excited-state DPAA. By contrast, the generation of 1 O 2 during the photodegradation of DPAA was confirmed by electron paramagnetic resonance (EPR) studies, but 1 O 2 had little effect on the photodegradation of DPAA. Phtotodegradation of DPAA was also studied in soil leachates and groundwater and the photolytic rate of DPAA was controlled by the total organic carbon (TOC) content in soil leachates and by the NO 3 − concentration in groundwater. Finally, studies on the effects of common solutes on the photodegradation of DPAA show that Cl − can increase the photolytic rate of DPAA by prolonging the lifetime of excited-state DPAA. Moreover, NO 3 − , NO 2 − , and humic acid (HA) can decrease the photolytic rate of DPAA by suppressing the production of excited-state DPAA. This research shows the detailed mechanism of DPAA photodegradation and provides a new and effective method for DPAA decontamination.
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Advanced Materials Technologies
·
2017
·Vol. 2
·期 12
·1700221
·
IF 0
Kai Song,Nan Ma,Ya Yang
Semiconductor materials based UV photodetectors can be operated via photovoltaic effect by converting UV light into electric signals. Recent studies have been focused on how to fabricate excellent semiconductor materials based photodetectors through construction of heterojunctions, which may not be suitable for practical large-scale devices due to the high cost and sophisticated fabrication process. Here, by utilizing naturally existing temperature change of UV illumination and the pyroelectric effect of ferroelectric materials, a novel self-powered UV photodetector based on Pb(Zr,Ti)O 3 (PZT) material is presented through a simple fabricating process, which can be well utilized to detect 365 nm UV light by using light-induced temperature variation. Under a temperature change rate of 2.40 K s −1 , the voltage response and the corresponding responsivity can be enhanced by larger than 6600% as compared with that of individual UV light illumination. This study provides a feasible solution to realize self-powered UV light detection by utilizing light-induced pyroelectric effect in PZT.
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FIBERS AND POLYMERS
·
2017
·Vol. 17
·期 3
·396-401
·
IF 1.113
Zhang Haidong,Huang Yi,Wang Chenglong,Wang Lili,Shao Jianzhong
To decrease the pollution discharge and energy consumption resulting from textile finishing using the conventional pad-dry-cure process, a blue light-curable digital finishing for textile was innovatively proposed. Based on the mechanism of blue light curing technique, a combination of the blue light curing process and anti-UV finishing was established in this study. A blue light-curable anti-UV finishing solution containing oligomers, monomers, photoinitiators, and anti-UV agents was padded onto the surface of the cotton fabrics, and then cured to form a tough film under blue light irradiation. The ultraviolet protection factor (UPF) value of the finished cotton fabrics was 50, the top level of international standards, demonstrating excellent UV resistance. The finished cotton fabrics also showed good rubbing and washing durability, and acceptable handle. The integration of an anti-UV finishing with the blue light curing technique presents some unique advantages in terms of environmental protection and application potential.
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JOURNAL OF POLYMER RESEARCH
·
2014
·Vol. 21
·期 9
·1-8
·
IF 1.897
Liu Xin,Cheng Jue,Zhang Junying
A facile method is described for preparing thermal plastic polyurethane-polystyrene (PUPS) block copolymer. 2-Hydroxy-2-methyl-1-phenyl-1-propanone (HMPP)-capped polyurethane was synthesized and used as macrophotointiator to prepare PUPS by ultraviolet (UV) irradiation polymerization of styrene. The polymerization process of PUPS block copolymer was monitored by real-time FTIR, 1 H NMR, and GPC, which confirmed the conversion of styrene and formation of PUPS block copolymer. The influence of reaction temperature on styrene conversion was investigated and the results demonstrated the feasibility of preparation of PUPS block copolymer by UV polymerization at ambient temperature. The DSC and TG data revealed a new glass transition temperature and degradable step respectively for PUPS block copolymer induced by polystyrene block compared with neat polyurethane and polyurethane macrophotoinitiator, which further clarified the formation of PUPS block copolymer. The properties measurements showed that the prepared PUPS block copolymer exhibited better tensile strength, hardness and water-resistance than neat polyurethane.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Zhisong Lu,Cuiping Mao,Mei Meng,Sangui Liu,Yunli Tian,Ling Yu,Bai Sun,Chang Ming Li
To endow silk with UV-shielding ability and antibacterial activity, CeO 2 nanoparticles were immobilized on silk surface via a dip-coating approach without changing silk structure. Surface density of the nanoparticles could be easily adjusted by controlling the number of dip-coating cycle. Enhanced thermal stability of the modified silk is exhibited in thermogravimetric analysis (TGA) and derivative thermogravimetric analysis (DTG). The excellent UV-protection ability and antibacterial property of the CeO 2 nanoparticle-coated silk are demonstrated in UV–vis diffuse reflectance spectroscopy and colony-forming capability test, respectively. Based on the data, it can be concluded that CeO 2 nanoparticles could be used as a very promising coating material to modify silk for UV-protection and antibacterial applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2013
·
IF 5.825
Shulian Wang,Wanhong Ma,Yanfen Fang,Manke Jia,Yingping Huang
Bismuth oxybromide (BiOBr) was prepared and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectroscopy (DRS). The BiOBr promoted detoxification of cylindrospermopsin (CYN) under UV ( λ < 350 nm) and visible light ( λ > 420 nm) illumination was studied. The results revealed that the toxic uracil unit of CYN was removed, and the carboxylic group of the degraded product was also decomposed, to give the innoxious tricyclic guanidine product under the title conditions. In contrast, the traditional Fenton reagents (Fe 2+ and H 2 O 2 ) limited to remove the uracil moiety of CYN with the carboxylic group intact. Presumably, the decarboxylation ability of BiOBr was induced by Br 4 p valence band hole ( h Br 4 p + ), and the degradation mechanism was also proposed based on the experimental results and theoretical calculation.
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