Journal of Advanced Ceramics
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2021
·Vol. 10
·期 4
·809-819
·
IF 6.707
Yan Tianxiang,Chen Kaiyuan,Li Chengqi,Liu Min,Wang Jie,Fang Liang,Liu Laijun
(1− x )K 0.5 Na 0.5 NbO 3 − x Bi(Zn 2/3 Nb 1/3 )O 3 ((1− x )KNN− x BZN, x = 0.010, 0.015, 0.020, 0.025, and 0.030) lead-free ceramics were fabricated via a traditional solid-state method. The crystal structure, microstructure, dielectric, and conductivity behavior of this system were studied. Combined with X-ray diffraction (XRD) patterns, Rietveld refinement, and dielectric spectroscopy, an orthorhombic phase was determined for x = 0.010, an orthorhombic-tetragonal mixed phase was identified for x = 0.015, and a rhombohedral symmetry appears in 0.020 ⩽ x ⩽ 0.030. Both 0.98KNN−0.02BZN and 0.975KNN−0.025BZN ceramics exhibit stable permittivity and low dielectric loss tangent (tan δ ) in wide temperature ranges owing to the combination of rhombohedral-tetragonal step-like feature and the diffuse phase transition from tetragonal to cubic. The activation energies of dielectric relaxation and conductivity behavior at high temperatures initially decrease slightly, then drop sharply, and finally decline slowly, which could be attributed to microstructure morphologies and the concentration of oxygen vacancies.
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MEDICINAL CHEMISTRY RESEARCH
·
2021
·Vol. 30
·期 6
·1240-1248
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IF 1.965
Shi Bo-Ya,Wang Ze-Hao,Zhang Ning,Xie Yin-Rong,Sun Xiu-Li,Yang Hao-Nan,Wu Yi-Long,Zi Cheng-Ting,Wang Xuan-Jun,Sheng Jun
Novel glucosylated (-)-epigallocatechin-3-gallate derivatives 10 – 13 having the EGCG analogs conjugated to the d -glucosyl azide were synthesized by carrying out the copper-catalyzed azide-alkyne cycloaddition (CuAAC) reaction, and were evaluated for their cytotoxicities against a panel of five human cancer cell lines (HL-60, SMMC-7721, A-549, MCF-7, and SW480) using MTT assays. Compounds 10 and 11 showed the highest levels of cytotoxicity against the HL-60 cells with IC 50 values of 4.57 and 3.78 μM, respectively, and showed moderate selectivity toward cancer cell lines. Compound 11 was also shown to induce apoptosis in HL-60 cells. Most notably, inclusion of the perbutyrylated glucose residue in an EGCG derivative was concluded to lead to increased anticancer activity.
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ELECTROCHIMICA ACTA
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2020
·
IF 6.215
Sixuan Xiao,Yujie Zhang,Debao Xiao
Visualization of latent fingermarks has ever been realized through electrochromism (EC) on stainless steel used as an electrode of electrochromic device (ECD). However, enhancement of fingermarks on paper using EC remains unresolved. Considering the hydrophobicity differences between the protruding and the concave parts of sebum-containing fingermarks, we attempt to devise ECDs capable of visualizing latent fingermarks on copperplate paper. It is demonstrated that the sulfonated viologen, 1,1′-bis(3-sulfonatopropyl) viologen can be used as an excellent chromophore for latent fingermarks enhancement on copperplate paper using EC, with either 1,1′-ferrocenedimethanol, or vitamin C or potassium ferrocyanide/potassium ferricyanide as the electron mediator. The as-fabricated ECDs can display the characteristic second level details of latent fingermarks left on copperplate paper under a voltage of -1.2 V. This work opens a new avenue for visualizing latent fingermarks on copperplate paper, which is a frequently-used potential physical evidence in office and daily life that may be useful for forensics.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yinli Duan,Jing Ma,Jianan Dai,Liangsheng Qiang,Juanqin Xue
Very efficient and low-cost photocatalysts containing Indium hydroxide (In(OH) 3 ) anchored on zinc oxide (ZnO) with various morphologies (e.g., hexagonal, pyramids, elliptic, etc.) were synthesized using a hydrothermal approach. The strong interaction between In(OH) 3 and ZnO was investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N 2 adsorption-desorption, UV–vis diffuse reflectance spectroscopy (UV–vis DRS), and X-ray photoelectron spectroscopy (XPS). In(OH) 3 particles grew directly on the ZnO surface and strongly interacted with it, which contributed to the excellent photocatalytic performance of ZnO. A possible formation mechanism of the In(OH) 3 /ZnO nanostructures was proposed. Experiments on photodegradation of methylene blue (MB) showed that the photocatalytic activity of the In(OH) 3 /ZnO nanocomposites correlated with the material morphology. The highest MB removal efficiency by the In(OH) 3 /ZnO hybrid photocatalysts was 90.5% after 120 min exposure to the visible light. The significant improvement of photocatalytic activity of In(OH) 3 /ZnO hybrid can be attributed to their special structural features, which allowed for an extended spectral response as well as for enhanced separation of photogenerated charge carriers. The design principles of this hybrid material apply to other metal-oxide systems to widen variety of advanced material systems with multifunctional properties useful for sensing and other advanced applications.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2020
·
IF 4.192
Jiaojiao Li,Li Zhang,Tao Wu,Yafei Li,Xiaojun Zhou,Zheng Ruan
Destruction in intestinal barrier is concomitant with the intestinal diseases. There is growing evidence that tryptophan-derived intestinal bacterial metabolites play a critical role in maintaining the balance of intestinal mucosa. In this study, the Caco-2/HT29 coculture model was used to evaluate the effect of indole-3-propionic acid (IPA) on the intestinal barrier and explore its underlying mechanism. We found that IPA increased transepithelial electrical resistance and decreased paracellular permeability which was consistent with the increase in tight junction proteins (claudin-1, occludin, and ZO-1). Furthermore, IPA strengthened the mucus barrier by increasing mucins (MUC2 and MUC4) and goblet cell secretion products (TFF3 and RELMβ). Additionally, IPA weakened the expression of LPS-induced inflammatory factors. These discoveries provide new views for understanding the improvement of intestinal barrier by gut microbial metabolites of aromatic amino acids.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 5
·1-11
·
IF 6.232
Zhou Zhide,Zhao Le,Li Wenzhan,Chen Min,Feng Huafu,Shi Xiaohang,Liang Jintao,Li Guiyin
A Glypican-3 (GPC3) electrochemical aptamer nanobiosensor based on hemin/graphene nanohybrids (HGNs) peroxidase-like catalytic silver deposition and GPC3 aptamer has been constructed for the determination of GPC3. The HGNs were prepared by an one-step reduction method. Fourier transform infrared spectroscopy (FT-IR), ultraviolet spectroscopy (UV-vis), and transmission electron microscopy (TEM) were used to study the structure and morphological characteristics of the HGNs. The GPC3 electrochemical aptamer nanobiosensor was constructed using HGNs-aptamer (HGNs-Apt) as the signal probe and GPC3 aptamer as the capture probe. With the help of the catalytic action of peroxidase-like properties of HGNs, H 2 O 2 reduces the silver (Ag) ions in solution to metallic Ag, which deposit on the surface of the electrode. The amount of deposited Ag, which was derived from the amount of GPC3, was quantified by differential pulse voltammetry (DPV). Under optimal conditions, the current response of Ag had a good positive correlation with the GPC3 concentration in the range 10.0–100.0 μg mL −1 with a correlation coefficient of 0.9958. The detection limit was 3.16 μg mL −1 at a signal-to-noise ratio of 3, and the sensitivity was calculated to be 0.807 μA μM −1 cm −2 . The method is validated by analyzing spiked human serum samples with good recovery ranging from 101 to 122%. In addition, the GPC3 electrochemical aptamer nanobiosensor has acceptable selectivity, stability, and reproducibility.
A Glypican-3 electrochemical aptamer nanobiosensor based on hemin/graphene nanohybrids (HGNs) peroxidase-like catalytic silver deposition and GPC3 aptamer has been constructed for the determination of GPC3. The electrochemical aptamer nanobiosensor exhibits high selectivity, acceptance reproducibility, and good recovery performances.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
·
IF 6.551
Yan Xia,Xiang-Mei Xiang,Kang-Yu Dong,Yan-Yan Gong,Zhan-Jun Li
Microplastics (MPs) have aroused rising social concerns. Although amounts of surfactants exist in wastewater and are expected to alter the surface properties of MPs significantly as they are designed to be adsorbed by hydrophobic particles. However, rare works have been done on the influence of surfactants on the coagulation removal process of MPs which was thought to be an effective way to remove MPs together with other natural particles, such as clay. We used 3-D fluorescence imaging to track the coagulation removal process of polystyrene MPs. Our results indicate that nonionic surfactant, tween 20 in ppm scale, could inhibit the coagulation removal of polystyrene MPs significantly. Residue MPs in the effluent is proportional with the surfactant concentration and increases up to tens of times, which will lead to a dramatic increase in their potential environmental risks. Apparent size effect exists in the coagulation in which smaller MPs can escape from the coagulation removal more easily. Mechanism study suggests that the steric resistance of the hydrophilic flexible polyethylene glycol (PEG) layer formed by tween 20 adsorbed on MP surface inhibits clay deposition and thus hinders subsequent agglomeration and precipitation. A surfactant stealth effect, which is used in the design of nanomedicine to avoid the human immune recognition and clearance of nano-drugs from blood circulation , also exists in the coagulation removal process of MPs. Our finding not only proves the strong influence of surfactants on MPs but also will stimulate related studies on other latent surfactant effects of MPs.
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Natural Product Communications
·
2020
·
IF 0.468
Na Li,Dongdong Xin,Hongbo Li,Yanyan Zhao,Wei Zhou,Hao Zhang,Liangbin Hu,Yaming Ge,Haizhen Mo
Fluoride is an essential trace element, but its beneficial range is narrow, and excess fluoride may have negative health effects. The objective of this study was to investigate the potential cytoprotective effects of epigallocatechin-3-gallate (EGCG) in cultured neuro-2a neuroblastoma cells exposed to sodium fluoride (NaF)-induced oxidative stress. Isolated Neuro-2a cells were exposed to increasing concentrations of NaF (0, 1, 2, 4, 6, and 8 mM) for 24 hours to induce oxidative stress. Moreover, to determine the concentration of EGCG necessary for protective effects, we exposed isolated Neuro-2a cells to increasing concentrations of EGCG (0, 0.5, 1, 5, 10, 20, 40, 60, 80, and 100 μg/mL) for 24 and 48 hours. Pretreatment with EGCG at various doses (0, 0.5, 1, 5, 10, 20, and 40 μg/mL) was evaluated in Neuro-2a cells for 24 hours, followed by an NaF (4 mM per culture well) challenge for 24 hours. As shown in this study, EGCG can protect Neuro-2a cells from NaF-induced apoptosis. This effect may be due to the reactive oxygen species scavenging activity of EGCC.
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EXPERIMENTAL CELL RESEARCH
·
2021
·
IF 3.905
Lili Tan,Jie Lu,Limin Liu,Lu Li
Atherosclerosis is the underlying contributing factor of cardiovascular disease, which is a process of inflammation and lipid-rich lesion. Macrophage-derived foam cell is a key hallmark of atherosclerosis and connected with various factors of lipid metabolism. Here, we showed that fatty acid binding protein 3 (FABP3) was upregulated in the aorta of ApoE −/- mice with high-fat-diet (HFD) feeding. Knockdown of FABP3 in HFD-fed ApoE −/- mice notably facilitated cholesterol efflux, inhibited macrophage foam cell formation, and thus prevented atherogenesis. Furthermore, FABP3 silencing decreased the expression of peroxisome proliferator-activated receptor γ (PPARγ). Mechanistic studies had disclosed the involvement of PPARγ signaling in balancing cholesterol uptake and efflux and diminishing foam cell formation. These findings firstly revealed an anti-atherogenic role of FABP3 silencing in preventing foamy macrophage formation partly through PPARγ, which might be a beneficial approach for therapying atherosclerosis.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Lang Bian,Xudong Qi,Kai Li,Jinhui Fan,Zhanmiao Li,Enwei Sun,Bin Yang,Shuxiang Dong,Wenwu Cao
Ternary 0.552Pb(Ni 1/3 Nb 2/3 )O 3 -xPbZrO 3 -(0.448-x)PbTiO 3 (PNN-PZ-PT) ceramics near the triple point compositions were fabricated by an improved two-step sintering method. The triple point composition 0.552PNN-0.135PZ-0.313PT ceramic has outstanding piezoelectric performance with piezoelectric coefficient d 33 = 1200 pC/N. Its easy fabrication and low cost make this piezoelectric material an excellent candidate for high sensitivity sensors and ultrasonic transducers. The evolution of domain structures for ceramics with composition near the triple point provides deeper insight into the mechanism of ultrahigh piezoelectric properties of PNN-PZ-PT ceramics.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Zhongwei Guo,Kaifei Zhang,Hui Guan,Meihong Liu,Sanchuan Yu,Congjie Gao
Surface modification has been adopted to tune surface property of nanofiltration membrane for improved separation performance. However, it has rarely been explored to modulate membrane pore size distribution. Here, we reported a novel modification strategy combined with surface cross-linking and in-situ condensation for fabricating composite nanofiltration membrane with reduced and homogenized pore size. The strategy was fulfilled by soaking the surface of nascent polyamide-based membrane with an aqueous solution of 3-aminopropyltriethoxysilane (APTES). Membrane physico-chemical property analyses demonstrated that the hydrolyzed APTES molecules bonded onto membrane surface through amidation and esterification reactions with the residual acyl chloride groups, and chemically combined with each other through condensation reaction. Modification was found to hydrophilize membrane surface, homogenize pore size and reduce mean pore diameter. The modification under desired conditions led to an improvement in pure water permeance from 12.2 to 14.0 l/m 2 h bar, a decrease in geometric mean pore diameter from 0.71 nm to 0.63 nm, and a decline in geometric standard deviation from 1.32 to 1.23. Permeation test results showed that the APTES-modified membrane also exhibited improved removal performance to methylene blue and cresol red removal and enhanced antifouling resistances to model foulants cetyltrimethylammonium bromide, humic acid and bovine serum albumin.
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RSC Advances
·
2020
·Vol. 10
·期 2
·689-697
·
IF 3.119
Caixia Li,Hanxue Li,Jiahao Guo,Liang Li,Xiaowei Xi,Yanyan Yu
A series of injectable and biocompatible delivery DOX-loaded supramolecular hydrogels were fabricated by using presynthesized DOX-2N-β-CD, Pluronic F-127 and α-CD through host–guest interactions and cooperative multivalent hydrogen bonding interactions. The compositions and morphologies of these hydrogels were confirmed by PXRD and SEM measurements. Moreover, the Rheological measurements of these hydrogels were studied and the studies found that they showed a unique thixotropic behavior, indicting a fast self-healing property after the continuous oscillatory shear stress. Using α-CD as a capping agent, slow and sustained DOX release was observed at different pH values after 72 h. The amount of DOX released at pH 7.4 was determined to be 49.0% for hydrogel 1, whereas the releasing amount of the DOX was increased to 66.3% for hydrogel 1 during the same period at pH 5.5 (P < 0.05), indicating a higher release rate of the drug under more acidic conditions. Taking hydrogel 1 as a representative material, the toxicities of DOX and hydrogel 1 on ovarian cancer cells (SKOV-3) at different exposure durations were examined. The results revealed that hydrogel 1 was less cytotoxic than free DOX to SKOV-3 cells (P < 0.05), suggesting sustained release by these hydrogels in the presence of ovarian cancer cells. It is anticipated that this exploration can provide a new strategy for preparing drug delivery systems.
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