FIBERS AND POLYMERS
·
2019
·Vol. 20
·期 2
·280-292
·
IF 1.439
Shi Wenying,Li Hongbin,Du Qiyun,Wang Shuo,Zhang Haixia,Qin Xiaohong
Carboxylated multi-walled carbon nanotubes (cMWCNTs) were incorporated in membrane matrix during the drywet spinning process to improve membrane performance. Membrane surface composition and morphology were examined by means of FTIR and SEM. The effects of cMWCNTs content on membrane surface hydrophilicity, separation performance and dye adsorption properties were well investigated and characterized through WCA examination, the cross-flow filtration measurement and the adsorption experiment. The surface hydrophilicity, the water permeability, solute rejection and dye adsorption properties of the cMWNTs-incorporated hollow fiber membranes have been all improved. When cMWNTs content was 0.3 wt%, the cMWNTs-incorporated hollow fiber membrane obtained the obvious enhanced pure water flux (137.2 L·m -2 ·h -1 , at 0.1 MPa) which was 1.5 times as high as that of the original PSF hollow fiber membrane. The prepared cMWCNTs-incorporated membranes are expected to be used in the treatment of textile dyeing wastewater or employed as the supports of the composite membranes.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 12
·2531-2543
·
IF 3.286
Liu Haijian,Jia Lu,Wang Yixuan,Wang Mengyao,Gao Zideng,Ren Xueqin
In this work, a novel ratiometric fluorescent sensor, based on carbon dots (CDs) and gold nanoclusters (AuNCs), is developed for highly sensitive and selective visual colorimetric detection of Cu 2+ and alkaline phosphatase (ALP). The ratiometric fluorescent sensor was synthesized by covalently linking 11-mercaptoundecanoic acid (11-MUA)–stabilized AuNCs to the surface of amino-functionalized CD/SiO 2 nanoparticles. The red fluorescence of the AuNCs can be quenched by Cu 2+ owing to coordination between Cu 2+ and 11-MUA; however, the blue emission of the CDs was insensitive to Cu 2+ owing to the protective silica shell. The quenching of the AuNCs’ fluorescence returned when PPi was added because of the higher affinity between Cu 2+ and PPi than that between Cu 2+ and 11-MUA. In the presence of ALP, PPi was catalytically hydrolyzed into phosphate (Pi), which showed a much weaker affinity for Cu 2+ . Thus, Cu 2+ ions were released, and the fluorescence of the AuNCs was quenched once more. Based on this principle, Cu 2+ and ALP could be simultaneously detected. The developed ratiometric fluorescent sensor could detect Cu 2+ over a range from 0.025 to 4 μM with a detection limit of 0.013 μM and ALP over a range from 0.12 to 15 U/L with a detection limit of 0.05 U/L. The present method was successfully applied for the detection of Cu 2+ and ALP in real water samples and in human serum samples, respectively. This ratiometric fluorescent approach may provide a highly sensitive and accurate platform for visual Cu 2+ and ALP sensing in environmental monitoring and medical diagnosis.
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PubMed
高影响因子
JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
·
2019
·Vol. 56
·期 3
·1095-1103
·
IF 1.85
Zhang Baodong,Huang Chongxing,Zhang Linyun,Wang Jian,Huang Xingqiang,Zhao Yuan,Liu Ying,Li Cuicui
In this study, fresh mangos were packed using a custom-made antimicrobial film coated with sustained-release chlorine dioxide microcapsules. We then compared physical and chemical indexes, such as weight loss rate, firmness, chromatic aberrations, soluble solids, vitamin C, titratable acid, and other nutritional indicators, to examine changes in the mango and film during storage. Our findings revealed that control mango showed loss of edible value and commercial value after 21 days of storage, and the chlorine dioxide microcapsule antibacterial film group still retains food value and commercial value. Cross-sectional scanning electron microscopy images of the used film showed that the polylactic acid film was smooth and flat, whereas cross-sections of the antimicrobial film showed that the film was covered with voids due to deliberate release of chlorine dioxide gas during the packaging process. Thus, the antibacterial film exhibited erosion and degradation. These findings provided important insights into the use of antimicrobial films for the packaging of fruits during storage, which is essential for promoting the application of solid chlorine dioxide antimicrobial film in packaging preservation.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-10
·
IF 5.479
Hu Yunxia,Su Luyao,Wang Sui,Guo Zhiyong,Hu Yufang,Xie Hongzhen
A method is described for combined magnetic solid phase microextraction and electrochemiluminescent (ECL) detection of the antibiotic tetracycline. A nanocomposite of type Fe 3 O 4 @SiO 2 @ZnO was used as the sorbent. Tetracycline has a strong affinity for Zn(II) ion and therefore is well extracted by this sorbent. The loaded sorbent can be magnetically removed. The extraction efficiency at a 1.0 μM tetracycline concentration is around 88%. Detection is based on the use of carbon nanodots that were prepared form urea and ethylenediaminetetraacetic acid as raw materials. The electrochemical probe Ru(bpy) 3 2+ was added to generate double ECL when scanning the potential between −3.5 and + 2 V. The two ECL signals decreased with the increase of tetracycline concentration. Under optimized experimental conditions, the ratio of the two signals is linearly related to the logarithm of the tetracycline concentration in the range from 1.0 nM to 0.1 mM, with a 0.47 nM detection limit. The method was successfully applied to the determination of tetracycline in spiked milk. It exhibited good sensitivity, selectivity and accuracy due to ratiometric read-out and prior preconcentration of analyte.
Tetracycline (TC) has a strong affinity for Zn(II) ion and is well extracted by the Fe 3 O 4 @SiO 2 @ZnO nanocomposite. Ru(bpy) 3 2+ can generate double electrochemiluminescence signals based on the use of carbon nanodots (C-dots) as coreactant. The two signals decrease with the increase of tetracycline concentration. [Ru(bpy) 3 2+ ]* stands for excited state Ru(bpy) 2 2+ .
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高影响因子
Acta Geochimica
·
2019
·Vol. 38
·期 4
·517-529
·
IF 0
Niu Yanhui,Yu Wenbin,Qin Zonghua,Nie Xin,Yang Shuguang,Wan Quan
Adsorption by nanoporous media is critically involved in many fundamental geological and geochemical processes including chemical weathering, element migration and enrichment, environmental pollution, etc. Yet, the adsorption behavior of metal ions on nanoporous materials has not been systematically investigated. In this study, MCM-41 material with a monodisperse pore size (4.4 nm) and a large BET specific surface area (839 m 2 /g) was hydrothermally prepared and used as a model silica adsorbent to study the adsorption characteristics of Cu 2+ as a representative metal ion. The Cu 2+ adsorption capacity was found to increase with increasing suspension pH in the range from 3 to 5 and to decrease in the presence of NaNO 3 . At 25 °C, pH = 5, and a solid-to-liquid ratio of 5 g/L, the adsorption capacity was determined to be 0.29 mg/g, which can be converted to a dimensionless partition coefficient of 45, indicating a strong enriching effect of nanoporous silica. The adsorption isotherm and kinetic data were fitted to several commonly used thermodynamic, kinetic, and diffusion models. The adsorption mechanism was also studied by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and synchrotron-based X-ray absorption spectroscopy. The results suggest that Cu 2+ ion adsorption is an entropy-driven endothermal process, possibly involving both outer-sphere and inner-sphere complexes.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 7
·1-10
·
IF 5.479
Li Yana,Sun Jun,Mao Wei,Tang Sheng,Liu Kai,Qi Tong,Deng Huimin,Shen Wei,Chen Lizhuang,Peng Luming
Antimony-doped tin oxide nanoparticles (ATO NPs) were loaded on a filter paper where they act as a peroxidase mimic without electrochemical or photochemical assistance. The peroxidase mimicking activity is distinctly improved compared to most known nanomaterials and to natural horseradish peroxidase. The catalytic properties depend on the amount of antimony doped into the ATO NPs. A glucose assay was worked out that is based on (a) the oxidation of glucose by glucose oxidase under formation of H 2 O 2 , (b) the oxidation of 3,3,5,5-tetramethybenzidine (TMB) catalyzed by ATO NPs to form blue-green colored oxidized TMB on the surface of the paper. The coloration was analyzed with a smartphone. The method has a 21 μM limit of detection and a linear range that extends from 0.5 to 80 mM.
Antimony-doped tin oxide nanoparticles (ATO NPs) combined with 3,3,5,5-tetramethybenzidine (TMB) and triethylamine were coated on the filter paper. After addition of sample solution, the blue-green colored oxidized TMB was generated and recorded by a digital camera.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 37
·期 8
·767-773
·
IF 2.804
Wang Xiao-Cheng,Zhou Shi-Xin,Ding Lan,Zhao Yu-Han,Min Shen-Xi,Dong Bin,Song Bo
Incorporating fluorophores into polymeric nanoparticles has been testified as a feasible way to improve the emitting property and bio-compatibility of nano-emitters, which can be applied as fluorescent probes in labeling cells for imaging. Plenty of efforts have been made on the above direction. However, the size effect of nano-emitters has not been addressed yet mainly given the difficulties in controlling morphology and size of the assemblies. In our preceding study, we employed post-polymerization modification method for preparing amphiphilic copolymers, and obtained core-shell (the hydrophobic fluorophores are wrapped inside the nanoparticle to form the core) assemblies in aqueous solution. By this method, we are able to regulate the ratio of the hydrophilic/hydrophobic moieties, and thus alternate the size of the assemblies in a rather simple way. In this study, we synthesized a series of random copolymers by changing the ratio of poly(ethylene glycol) to tetraphenylethylene groups. Notably, the number of repeating units of the polymer was controlled constant for all the copolymers. The self-assembly of these copolymers resulted in different sizes of nanoparticles, and the size decreased with the decreasing fraction of poly(ethylene glycol). Interestingly, the emission of the nanoparticles showed size dependence, and smaller diameter corresponded to stronger emission. Being cultured with HeLa cells, either the large (diameter of ∼300 nm) or the small (diameter of ∼180 nm) nano-emitters allowed for very high cell viabilities up to 25 µg·mL −1 . Both of them can be applied in cell imaging and provide high contrast fluorescent images.
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CELLULOSE
·
2019
·Vol. 26
·期 8
·5033-5049
·
IF 3.917
Chen Yong,Ma Yijia,He Qingkun,Han Qiuxia,Zhang Qiang,Chen Qi
Abstract Cotton cellulose was modified with polysiloxane with dual antimicrobial groups of pyridinium and N -chloramine (N-Cl) to endorse enhanced synergistic biocidal ability. A new compound, 4-oxo- N -(pyridin-4-yl)pentanamide (OPPA), that contains precursors of both pyridinium and N -chloramine was synthesized via amidation of 4-oxopentanoic acid and 4-aminopyridine. The molecules of OPPA were connected to cotton cellulose using poly(methylhydrosiloxane) (PMHS) as linker through hydrosilylation reaction between some Si–H groups of PMHS and hydroxyl groups of cellulose and some other Si–H groups and ketone carbonyl groups of OPPA. The OPPA on cellulose was transformed into its biocidal counterpart after quaternization of the pyridine to pyridinium and chlorination of the amide N–H to N -chloramine. The synthetic procedures and modification results were characterized with Fourier-transform infrared spectroscopy, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy. The pyridinium/ N -chloramine polysiloxane layer on cellulose was estimated to be 77 nm by weight and provided powerful and synergistic antibacterial capacities against model species of Escherichia coli and Staphylococcus aureus . The stability of the polysiloxane modifier layer and the rechargeability of lost chlorine were promising under repeated washing, long-term storage, and UV irradiation. The presented pyridinium/ N -chloramine polysiloxane layer showed advantages over many of the current systems containing either cationic salt or N -chloramine due to the synergism. Graphical abstract
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Mucosal Immunology
·
2019
·Vol. 12
·期 4
·945-957
·
IF 7.352
Qiu Miao,Huang Keqing,Liu Yanzhuo,Yang Yuqing,Tang Honglin,Liu Xiaoxiao,Wang Chenlong,Chen Honglei,Xiong Yu,Zhang Jing,Yang Jing
High-fat diet (HFD) promotes lung pre-metastatic niche formation and metastasis. Thus, there is an urgent need to identify the underlying mechanisms and develop strategies to overcome them. Here we demonstrate that glycyrrhizic acid (GA) prevents HFD-enhanced pre-metastatic niche formation and metastasis through gut microbiota. GA reduced HFD-enhanced myeloid-derived suppressor cell recruitment, pro-metastatic protein S100A8/A9 expression and metastasis burden of 4T1 breast cancer and B16F10 melanoma, accompanied by gut microbiota alteration and colonic macrophage polarization far away the M1-like phenotype. These parameters were greatly decreased by treatment with antibiotics, recolonization of Desulfovibrio vulgaris and Clostridium sordellii , and administration of lipopolysaccharide or deoxycholic acid. Macrophage depletion attenuated HFD-enhanced pre-metastatic niche formation and metastasis, but failed to further affect the effects of GA. Mechanistically, counteraction of HFD-enhanced gut microbiota dysbiosis by GA inhibited Gr-1 + myeloid cell migration and S100A8/A9 expression through decreasing the proportion of M1-like macrophages and their production of CCL2 and TNF-α in the colons via LPS/HMGB1/NF-κB signaling inactivation. Together, targeting the gut microbiota by GA to modulate colonic macrophages could be a novel strategy for the prevention of HFD-enhanced pre-metastatic niche formation and metastasis.
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Nano-Micro Letters
·
2019
·Vol. 11
·期 1
·1-12
·
IF 9.043
Ren Zongling,Wen Jie,Liu Wei,Jiang Xiaoping,Dong Yanheng,Guo Xiaolong,Zhao Qiannan,Ji Guipeng,Wang Ronghua,Hu Ning,Qu Baihua,Xu Chaohe
Layered SnS 2 nanosheets/reduced graphene fiber (SnS 2 @rGF) hybrid fabrics were fabricated as binder-free electrodes.
Ultralight rGF fabrics could increase the active materials loading to a high level of 67.2 wt% in the whole electrode, which is much higher than that of traditional slurry coating electrodes by using Cu or Al foil as current collectors.
The practical capacity based on the weight of electrode could increase to as high as ~ 538 mAh g −1 exceeding to the slurry coating electrodes.
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NPG Asia Materials
·
2019
·Vol. 11
·期 1
·1-18
·
IF 8.052
Liang Jianming,Zhu Ying,Gao Caifang,Ling Chengli,Qin Jing,Wang Qi,Huang Yongzhuo,Lu Weigen,Wang Jianxin
Current chemotherapeutics for glioma are not sufficiently effective due to their low tolerance and poor blood–brain barrier (BBB) permeability. Energy restriction based on co-delivery of albendazole (Abz) and nano-silver has been proven to suppress tumor growth without adverse effects. Accordingly, menthol was conjugated to BSA (MeB) to overcome the BBB-permeability issue. In this study, Abz-loaded MeB-silver nanoparticles (MBS-Abz) were developed by self-assembly of MeB, albendazole and nano silver for glioma targeting therapy. The nanoparticle entered the brain across the BBB and specifically accumulated in the glioma region. MeB delivered the nanoparticles across the brain capillary endothelial cell monolayer by promoting internalization and BBB disruption. MBS-Abz hindered ATP generation via the inhibition of glycolytic and mitochondrial pathways both in vitro and in vivo. The anti-glioma mechanisms of energy restriction were related to the cytotoxicity, proliferation inhibition, cell cycle arrest, and apoptosis induced by ATP exhaustion, and the effects of MBS-Abz were significantly better than those induced by monotherapy nanoparticles or unmodified nanoparticles. These results demonstrated that by combining the energy restriction effect of albendazole and nano silver, as well as the BBB penetration ability of menthol, MBS-Abz achieves superior anti-glioma efficacy and can be an effective strategy for glioma therapy.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 37
·期 9
·919-929
·
IF 2.804
Yang Shi-Xuan,Fan Zi-Yu,Zhang Feng-Yu,Li Si-Hao,Wu Yi-Xian
The random copolymers of isobutylene (IB) with polar comonomers of 4-acetoxystyrene (ACS) or 4- tert -butoxystyrene (TBO), P(IB- co -ACS) and P(IB- co -TBO), could be successfully synthesized via cationic copolymerization with FeCl 3 -based initiating system. The kinetics of the cationic copolymerization process was in situ investigated by inserting a diamond probe into the reaction system by ATR-FTIR spectroscopy. The chemical structure and incorporation content of polar comonomers in the copolymers were characterized by GPC with RI/UV dual detectors and 1 H-NMR spectroscopy. The corresponding functionalized random copolymers of IB with vinyl phenol P(IB- co -POH) carrying phenolic hydroxyl side groups could be further prepared via the complete hydrolysis of acetoxyl side groups in P(IB- co -ACS) or tert -butoxyl side groups in P(IB- co -TBO) copolymers. The functionalized P(IB- co -POH) copolymers became hydrophilic with water contact angle (WCA) of ca . 80° for the self-assembly in hot water, compared to the hydrophobic polyisobutylene with WCA of ca . 110°. The functionalized P(IB- co -POH) copolymers also displayed an excellent self-healing property due to the interaction of intermolecular hydrogen bonding and formation of three dimentional supramolecular networks from phenolic hydroxyl side groups. Furthermore, P(IB- co -POH) copolymers also provided a good matrix for the homogeneous dispersion for silica nanoparticles due to the formation of hydrogen bonding between copolymer chains and silica nanoparticles.
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