BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2019
·Vol. 102
·期 6
·789-794
·
IF 1.65
Yi Xianliang,Yu Mingyue,Li Zhaochuan,Chi Tongtong,Jing Siyuan,Zhang Keke,Li Wentao,Wu Minghuo
Marine organisms are often exposed to a mixture of various pollutants in marine environment (i.e., nanoparticles, organic pollutants). The present study investigated the potential effects of multi-walled carbon nanotubes (MWCNTs) on the toxicity of triphenyltin chloride (TPTCl). The results revealed an antagonistic interaction between MWCNTs and TPTCl on the copepod through 96 h acute exposure, which was attributed to the adsorption of TPTCl to MWCNTs and aggregation of MWCNTs in the test solutions. Results of 21 days’ chronic exposure showed that the effect concentration of MWCNTs could be 100 times lower than that of acute exposure. The exposure to binary mixture of MWCNT (1.0 mg/L) and TPTCl (0.3 µg/L) caused a reduction by 94% for the 3rd time spawning and 83% for the total number of hatched nauplii. The ingestion and exterior attachment of MWCNTs to the copepod might be the main reasons causing the adverse effect in reproduction.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 7
·1-7
·
IF 1.81
Li Peipei,Peng Xinsheng
Au–Cu bimetallic nanomaterials have attracted tremendous attention in the field of catalysis, water splitting, biosensor and biotherapy. Au 3 Cu nanocrystals with a definite stoichiometric ratio and ordered arrangement of atoms have shown great potential for efficient catalyts. Herein, we reported a new method for fabrication of Au 3 Cu nanocrystals. Their morphologies can be tuned by the amount of hydrochloric aqueous solution, including nanosquare and frame were achieved, respectively. The as-synthesized Au 3 Cu nanosquares not only demonstrated a comparatively high sensitivity of 324.8 μA mM −1 cm −2 as a non-enzymatic glucose sensor but also performed well in CO catalytic oxidation even at 50 °C with a conversion efficiency of 30 mmol g −1 h −1 .
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 324
·期 3
·1329-1337
·
IF 1.137
Zeng Dejun,Dai Ying,Zhang Zhibing,Wang Youqun,Cao Xiaohong,Liu Yunhai
In this work, the magnetic hydroxyapatite composite (Fe 3 O 4 @HAP) was prepared and used to remove of U(VI). The characterizations of transmission electron microscope and vibrating sample magnetometer indicated that the average size and saturation magnetizations ( M s ) of Fe 3 O 4 @HAP was about 360 nm and 20.89 emu g −1 , respectively. The results of solid-phase extraction indicated that at pH 5.0, the removal efficiency of Fe 3 O 4 @HAP was more than 95% within 20 min. The maximum adsorption capacity ( q m ) of Fe 3 O 4 @HAP was 789.58 mg g −1 . Therefore, Fe 3 O 4 @HAP may be a rapid and highly efficient magnetic adsorbent to remove of U(VI) from water.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 18
·22806-22817
·
IF 3.056
Li Jie,Yu Guangwei,Pan Lanjia,Li Chunxing,You Futian,Wang Yin
Antibiotics residues in aqueous environment and sewage sludge accumulation have become serious environmental issues. The aim of this study is to investigate the potential of ciprofloxacin (CIP) removal by sludge-based biochar prepared from co-pyrolysis of sewage sludge and bamboo waste (BW). The stability and environmental risk of heavy metals (HMs) in the biochar were further investigated to evaluate potential risks for biochar utilization. Results showed that BW was an outstanding additive to prepare co-pyrolyzed biochar from sludge. A higher CIP removal rate (95%) of BW-sludge biochar (SBC) was obtained under initial CIP concentration of 10 mg/L, and its maximum adsorption capacity was 62.48 mg/g which was calculated from the Langmuir model. The pseudo-second-order and Freundlich model also well fit the CIP adsorption process, indicating a chemical and multilayer adsorption of CIP on a heterogeneous surface of biochar. Adsorption mechanism analysis indicated that the diverse functional groups and Fe species in biochar probably were the dominant factors in the adsorption of CIP. The π-π interaction, H–bond, ion exchange, and Fe-complexation might be the main interactions between the functional species and CIP molecules. Besides, HMs, especially the Cr, Cd, and As, were well immobilized in SBC compared with pure sludge biochar. This work suggested that sludge-based biochar, especially the co-pyrolyzed SBC, could be a potential adsorbent for CIP removal from aqueous solutions.
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PubMed
高影响因子
CHROMATOGRAPHIA
·
2020
·Vol. 83
·期 6
·703-713
·
IF 1.596
Li Hong-Xing,Xie Tian-Peng,Xie Sheng-Ming,Wang Bang-Jin,Zhang Jun-Hui,Yuan Li-Ming
Porous organic cages (POCs) are an emerging class of porous molecular materials which self-assembled by discrete, shape-persistent, cage-like molecules and have recently received intensive interest in diverse fields. In this work, a hydroxyl-functionalized homochiral POC was synthesized by [4 + 6] condensation of 2-hydroxy-1,3,5-triformylbenzene with (1 R , 2 R )-diaminocyclohexane and coated on a capillary column for gas chromatography (GC) separations. Forty-one pairs of enantiomers belonging to various classes have been resolved on the column, including alcohols, diols, esters, lactones, halohydrocarbons, ethers, epoxides, ketones and sulfoxides. Compared with β-cyclodextrin derivative-based commercial β-DEX 120 column, previously reported chiral POCs- (CC9 and CC10) based columns, there are 12, 27 and 19 pairs of studied enantiomers cannot be resolved on β-DEX 120 column, CC9 column and CC10 column, respectively. Besides, both separation factors and resolution values of some racemates are higher on this column than those on β-DEX 120 column, CC9 column and CC10 column. The results demonstrate that the column exhibits good chiral recognition complementarity or superior chiral resolution capability to those columns which used for comparison, and the introduction of hydroxyl group enhances hydrogen-bonding interaction to some racemates, leading to better enantioselectivity. The column also shows excellent separation performance toward positional isomers of dichlorobenzene, dibromobenzene, nitrotoluene, chlorotoluene, nitrobromobenzene and nitrochlorobenzene. The retention time and selectivity of analytes have no significant changes after more than 500 injections and 260 °C conditioned for 6 h, showing the good repeatability and thermal stability of the column. This work indicates the promising prospect of POCs for GC separation, especially for the separation of enantiomers and also demonstrates the significance of design and synthesis of more functionalized chiral POCs for GC enantioseparation that broaden the enantiomer separation scope and applicability of POCs-based columns through their chiral recognition complementarities.
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COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 298
·期 6
·629-636
·
IF 1.536
Yang Xu,Li Wenbo,Sun Zhaojie,Yang Chunhui,Tang Dongyan
In this work, pH/temperature dual-sensitive polymers of P(NVCL-co-MAA) with the increased low critical solution temperature (LCST) values of about 37 °C that differed from that of ~ 32 °C of pure poly(N-vinyl caprolactam) (PNVCL) were synthesized via radical polymerization. Then the nanofibers of P(NVCL-co-MAA) and its cospinned nanofibers with nifedipine (NIF) as drug model were fabricated by electrospinning method. Structures and the interactions within the components were detected by FT-IR, NMR, and XPS methods. The dual-responsive properties and the controlling release of the drug were investigated by water contact angle tests and in vitro drug release tested by UV-vis spectrophotometer. SEM was conducted to demonstrate the morphology of the nanofibers and the obvious improved stabilized morphology of the modified system within the aqueous media. The maintained morphology within the media and the obvious elongated releasing period of over 150 min at 37 °C and with pH of 1.99 both proved the promising prospects of the fabricated nanofibers as excellent carrier in drug delivery system.
Graphical abstract
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高影响因子
Stem Cell Research & Therapy
·
2020
·Vol. 11
·期 1
·1-11
·
IF 5.116
Liao Naishun,Shi Yingjun,Wang Yingchao,Liao Fangyu,Zhao Bixing,Zheng Youshi,Zeng Yongyi,Liu Xiaolong,Liu Jingfeng
Background Although it has been preclinically suggested that adipose tissue-derived mesenchymal stem cell (ADSC)-based therapy could effectively treat chronic liver diseases, the hepatic engraftment of ADSCs is still extremely low, which severely limits their long-term efficacy for chronic liver diseases. This study was designed to investigate the impact of antioxidant preconditioning on hepatic engraftment efficiency and therapeutic outcomes of ADSC transplantation in liver fibrotic mice.Methods Liver fibrosis model was established by using intraperitoneal injection of carbon tetrachloride (CCl4) in the male C57BL/6 mice. Subsequently, the ADSCs with or without antioxidant pretreatment (including melatonin and reduced glutathione (GSH)) were administrated into fibrotic mice via tail vein injection. Afterwards, the ADSC transplantation efficiency was analyzed by ex vivo imaging, and the liver functions were assessed by biochemical analysis and histopathological examination, respectively. Additionally, a typical hydrogen peroxide (H2O2)-induced cell injury model was applied to mimic the cell oxidative injury to further investigate the protective effects of antioxidant preconditioning on cell migration, proliferation, and apoptosis of ADSCs.Results Our data showed that antioxidant preconditioning could enhance the therapeutic effects of ADSCs on liver function recovery by reducing the level of AST, ALT, and TBIL, as well as the content of hepatic hydroxyproline and fibrotic area in liver tissues. Particularly, we also found that antioxidant preconditioning could enhance hepatic engraftment efficiency of ADSCs in liver fibrosis model through inhibiting oxidative injury.Conclusion sAntioxidant preconditioning could effectively improve therapeutic effects of ADSC transplantation for liver fibrosis through enhancing intrahepatic engraftment efficiency by reducing oxidative injuries. These findings might provide a practical strategy for enhancing ADSC transplantation and therapeutic efficiency.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·13363-13371
·
IF 3.553
Cao Yutao,Yuan Yue,Shang Yafen,Zverev Vladimir I.,Gimaev Radel R.,Barua R.,Hadimani R. L.,Mei Lan,Guo Gang,Fu Hao
Micro-sized particles of Fe x Rh 100− x ( x = 50, 48, 45, 40, and 35) binary alloys were synthesized by a solid-phase reduction method and their structural properties, magnetic properties and cytotoxicity have been characterized. From X-ray diffraction results, the Fe 50 Rh 50 alloy is in a single chemically ordered α ′ phase while the face-centered cubic disordered γ phase arises and increases with Rh content when x is smaller than 50. The magnetization behavior of the alloys demonstrates that the α ′ phase consists of ferromagnetic and antiferromagnetic components due to the nonuniformity of elements in the particulate alloys. The maximal magnetic entropy change and the relative refrigeration capacity of the Fe 50 Rh 50 particles reach 9.7 J/kg K and 230 J/kg, respectively, with a 0–3 T magnetic field change. Despite its moderate magnetic entropy among the first-order transition materials, Fe 50 Rh 50 microparticles are promising for biomedical applications due to its large relative cooling power and low cytotoxicity.
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高影响因子
Food and Bioprocess Technology
·
2020
·Vol. 13
·期 7
·1119-1130
·
IF 3.356
Zhou Xin,Tan Zhuo,Zhou Qian,Shi Fei,Yao Miaomiao,Wei Baodong,Cheng Shunchang,Ji Shujuan
Cold storage can effectively delay the ripening of ‘Nanguo’ pears ( Pyrus ussuriensis Maxim.). However, the aroma-related esters of ‘Nanguo’ pears decreased after cold storage. In this study, we aimed to investigate the effect of intermittent warming (IW) treatment on the formation of aroma-related esters and unsaturated fatty acid synthesis from cold stored pears. IW-treated pears were exposed to 20 ± 1 °C for 1 day every 20 days during storage at 0 ± 0.5 °C, every 21 days was a cycle and a total of 90 days. The pears in control group were stored at 0 ± 0.5 °C for 90 days. After this 90-day storage, both groups of pears (control and IW-treated) were transferred to a shelf life of 12 days at room temperature. The results showed that, compared with the pears in control group, the productions of aroma-related esters and the expression levels of PuLOX1 , PuADH3 , and PuAAT1 in IW-treated pears were significantly higher during the shelf life ( P < 0.05). At the same time, IW-treated pears maintained significantly higher contents of linoleic acid and linolenic acid ( P < 0.05), which were precursors of aroma compounds. We also found that the expression of PuFAD2 and PuFAD3 had significant positive correlation with the contents of unsaturated fatty acids ( P < 0.05). The significantly higher expression levels of PuFAD2 and PuFAD3 in IW-treated pears may have played an important role in the improvement of ester contents ( P < 0.05). It could be inferred that IW treatment had an impact on the aroma-related esters of cold-stored ‘Nanguo’ pears through regulation of unsaturated fatty acid synthesis.
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IONICS
·
2020
·Vol. 26
·期 8
·4193-4200
·
IF 2.394
Zheng Li,Sun Wu-juan
A 3D metal-organic framework (Cu 4.5 (BTZE) 1.5 (OH) 4 (SO 4 )(H 2 O) 1.5 ∙4H 2 O) n (BTZE is 1,2-bis(tetrazol-5-yl) ethane anion) modified carbon paste electrode (Cu-BTZE/CPE) has been fabricated for hydrazine sensing. The Cu-BTZE framework was prepared through a facile solvo-thermal method and characterized by Fourier-transform infrared spectrometry, X-ray diffraction, and scanning electron microscopy. Meanwhile, the electrochemical performances of the modified electrode were studied by electrochemical impedance spectroscopy, chronocoulometry, cyclic voltammetry, and amperometry. Owing to the large electrochemically active surface area and enhanced electron transfer efficiency of Cu-BTZE framework, the Cu-BTZE/CPE showed enhanced electrocatalytic activity toward the oxidation of hydrazine compared with unmodified CPE. Under the optimized conditions, the amperometric current presented linear dependence on the concentration of hydrazine in the ranges of 0.02~1.2 μM and 1.2~500 μM, respectively. The detection limit was 6 nM, lower than the reported Cu-based hydrazine sensors. Furthermore, the sensor has applied for the determination of hydrazine in water samples.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 4
·1-9
·
IF 1.81
Qian Haoyu,Zhu Guisheng,Xu Huarui,Zhang Xiuyun,Zhao Yunyun,Yan Dongliang,Hong Xianyong,Han Yin,Fu Zhenxiao,Ta Shiwo,Yu Aibing
Tetragonal-phase BaTiO 3 powders of particle size 370 nm were synthesized by microwave sintering at 850 °C. The raw materials were BaCO 3 , TiO 2 , and alanine. SiC microspheres were used as microwave conductors. The effects of the holding time, sintering aids, and SiC addition on the preparation of BaTiO 3 were investigated. The results indicate that the addition of SiC as a microwave acceptor leads to formation of microwave micro-regions. This enables uniform heating of the raw materials and decreases the calcination temperature needed to obtain BaTiO 3 . Alanine coordinates with Ba, and this loosens the metal–CO 3 bond and promotes separation of CO 2 , decreases the BaCO 3 decomposition temperature, and provides a higher nucleation site density. It gives an idea about the microwave solid-state synthesis of BaTiO 3 powder.
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CHROMATOGRAPHIA
·
2020
·Vol. 83
·期 5
·677-681
·
IF 1.596
Huang Zhongping,Zhuge Chun,Dai Xuxin,Liu Huijun,She Yuanbin
An ion chromatography (IC) method coupled with solid-phase extraction was established for the simultaneous determination of trace organic acids and inorganic anions in sodium carboxymethyl cellulose (CMC). To prevent CMC from contaminating analytical column, a self-packed solid-phase extraction column packed with quaternized adsorbents was applied in sample pretreatment. An IonPac, AS11-HC column was used as the analytical column for separation of glycolate, chloroacetate, chloride, and sulfate with gradient elution of potassium hydroxide at a flow rate of 1.0 mL min −1 . Under the optimized chromatographic conditions, the linearity of the method was satisfactory over a concentration range of 0.5–150.0 mg L −1 with correlation coefficients of 0.9992–0.9999, and the limits of detection varied from 0.05 to 0.1 mg L −1 , based on the signal-to-noise ratio of 3. The proposed method was successfully applied to the analysis of organic acids and inorganic anions in CMC samples. The recoveries ranged from 86.7 to 109.0% with the relative standard deviations (RSDs) over the range of 0.32–3.61%. The method offers a reliable application for the analysis of trace organic acids and inorganic anions in complex anionic cellulose.
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