npj Biofilms and Microbiomes
·
2020
·Vol. 6
·期 1
·1-12
·
IF 7.067
Dong Yuhao,Li Shougang,Zhao Dan,Liu Jin,Ma Shuiyan,Geng Jinzhu,Lu Chengping,Liu Yongjie
Aeromonas hydrophila is the causative agent of motile Aeromonad septicemia in fish. Previous studies have shown that the myo -inositol metabolism is essential for the virulence of this bacterium. IolR is a transcription inhibitor that negatively regulates myo -inositol metabolic activity. While in the process of studying the inositol catabolism in A. hydrophila Chinese epidemic strain NJ-35, we incidentally found that ΔiolR mutant exhibited obvious autoaggregation and increased biofilm formation compared to the wild type. The role of surface proteins in A. hydrophila autoaggregation was confirmed by different degradation treatments. Furthermore, calcium promotes the formation of aggregates, which disappear in the presence of the calcium chelator EGTA. Transcriptome analysis, followed by targeted gene deletion, demonstrated that biofilm formation and autoaggregation caused by the inactivation of iolR was due to the increased transcription of a RTX-family adhesion gene, rmpA . Further, IolR was determined to directly regulate the transcription of rmpA . These results indicated that iolR is negatively involved in autoaggregation and biofilm formation in A. hydrophila , and this involvement was associated with its inhibition on the expression of rmpA .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food and Bioprocess Technology
·
2020
·Vol. 13
·期 6
·1024-1034
·
IF 3.356
Wang Qian,Zhang Li,Ding Wu,Zhang Dequan,Reed Kevin,Zhang Boce
This study aimed to develop self-assembled gelatin-chitosan (Gel-CS) nanocapsules as a water-soluble delivery system for alcohol-soluble compounds. Eugenol (Eug) selected as the model molecule for its high solubility in alcohol and insolubility in water. The study also examined different reaction conditions and reagent loading ratios to optimize eugenol-embedded gelatin-chitosan nanocapsules (Eug-Gel-CS NPs) formation. The optimal loading ratio of Gel, CS, and Eug was 3:1:2, which yielded an average particle size of 229.09 nm and an encapsulation efficiency of 50.69%. The morphological characteristics of Eug-Gel-CS NPs were further demonstrated by transmission electron microscopy. The prepared Eug-Gel-CS NPs also exhibited potential controlled-release properties in aqueous phase with the in vitro release percentage of 69.47 ± 1.24% over 36 h. This nanocapsule system may provide a platform to expand the potential applications of Eug in food and nutrition.
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 298
·期 8
·1013-1021
·
IF 1.536
Li Yuwei,Lian Ruili,Wang Xinmin,Liu Yonglu
Although ionic liquids have been studied as self-assembly media, the aggregation of fluorinated surfactants in ionic liquids has not been fully understood. In this work, the aggregation behavior of the fluorinated surfactant, N-ethylperfluorooctane sulfonamide (N-EtFOSA), in the aprotic ionic liquid, 1-ethyl-3-methylimidazolium ethylsulfate ([C 2 mim][EtSO 4 ]), was studied using surface tension, 19 F-NMR, dynamic light scattering (DLS), and cryo transmission electron microscopy (cryo-TEM). The surface properties and thermodynamic parameters were calculated based on the results of surface tension measurements. It was found that the fluorinated surfactant exhibits a considerable surface activity in aprotic ionic liquids, and its critical micelle concentration (cmc) increases with increasing temperature. In addition, the surface properties indicate that solvophobic interactions are the main driving force for micelle formation. The thermodynamic parameters for micelle formation derived from the temperature dependence of the cmc revealed that micelle formation is an enthalpy-driven process. DLS and cryo-TEM results indicated the presence of nanoscale micelles in the N-EtFOSA + [C 2 mim][EtSO 4 ] system. The results of this work imply that this fluorinated surfactant exhibits a more pronounced surface activity than conventional hydrocarbon surfactants in [C 2 mim][EtSO 4 ].
The self-assembly of fluorinated surfactants in aprotic ionic liquids
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2020
·Vol. 30
·期 10
·4027-4042
·
IF 1.941
Ma Tian,Wu Yunhai,Liu Ningning,Wu Yunying
Abstract In this study, iron manganese composite oxide (FeMnO x ) were integrated with multi-walled carbon nanotube (MWCNTs) to synthesize an effective adsorbent for acid orange (AO) and basic violet (BV), two widely used organic dyestuffs belonging to anionic and cationic, respectively. Among all the composites evaluated, the FeMnO x -MWCNTs with Fe–Mn ratios of 1:1 and load ratio of 45% achieved superior adsorption capacity than others, and was selected as the best adsorbent. The Characterization data indicated that the physicochemical properties and structural characteristics of FeMnO x -MWCNTs have changed obviously after modification, with larger specific surface area and richer groups. The maximum adsorption capacity of AO (403.23 mg/g) and BV (165.29 mg/g) could be attained under optimal conditions: 300 min, 0.05 g adsorbent dosage, 100 mg/L dyes and pH 2.0 (for AO) or pH 10.0 (for BV). Moreover, the adsorption kinetics of the two dyes were both well fitted the pseudo-second-order kinetics model, and the adsorption isotherms agreed well with the Freundlich model for AO while Langmuir model for BV. Moreover, the FeMnO x -MWCNTs with optimal FeMnO x content showed relatively higher final adsorption amount and faster adsorption rate, thus better fitting with the kinetics. A mechanism was proposed that physical adsorption is the dominator during the process. The results indicated that the introduction of FeMnO x into the MWCNTs significantly enhanced the dye removal efficiency, providing a promising method for the improvement of carbon nanometer adsorbents. Graphic Abstract The selected graph can not only express the synthetic methods of FeMnO x -MWCNTs by chemical coprecipitation, but also presented the adsorption process and mechanism of AO and BV, which showed the purposes of this work simultaneously.
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 150
·期 7
·1890-1897
·
IF 2.482
Zhou Na,Yan Ruiyao,Pan Yanlin,Fang Xue-Qian
The fast recombination of photogenerated electrons and holes in the pure TiO 2 leads to a low photocatalytic efficiency in hydrogen generation or solar energy conversion. Noble metal nanoparticles have been used to combine with TiO 2 for effective photocatalysis. Herein, Au@Ag@TiO 2 nanorods (NRs) with core–shell structure have been prepared by hydrolysis the precursor of titanium in acid environment. UV light–driven H 2 generation rate of Au@Ag@TiO 2 samples demonstrated 14 times enhancement compared to P25 TiO 2 at the same experimental conditions. The improved photocatalytic performance was due to the charge transfer from the conduction band of excited TiO 2 to Au@Ag NRs leading to effective separation of electron–hole pairs. This mechanism has been proved by transient absorption spectroscopy and photo-electrochemical (PEC) measurements. The time resolved photocurrents of P25 TiO 2 NPs is ~ 13 times higher that of Au@Ag@TiO 2 , indicating that a fraction of the photogenerated electrons of TiO 2 driven by UV light transfer to Au@Ag nanocores instead of transporting entirely to the ITO substrates. The ultrafast transient absorption and pump-probe measurements demonstrated a faster decay in Au@Ag@TiO 2 NRs compared to pure TiO 2 system, indicating that the photogenerated electron–hole recombination in TiO 2 is substantially suppressed by Au@Ag@TiO 2 NRs attributed to the effective trapping of the photogenerated electrons by the Au@Ag cores. Graphic Abstract Au@Ag@TiO 2 nanocomposites with core-shell structure have been prepared and its UV light–driven H 2 generation rate has been demonstrated 14 times enhancement compared to P25 TiO 2 at the same experimental conditions. The improved photocatalytic performance was due to the charge transfer, which has been proved by photocurrent measurement and the ultrafast transient absorption and pump-probe measurements.
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 5
·2939-2952
·
IF 4.21
Sun Mengying,Lv Jingchun,Xu Hong,Zhang Linping,Zhong Yi,Chen Zhize,Sui Xiaofeng,Wang Bijia,Feng Xueling,Mao Zhiping
Abstract A multi-responsive chromic textile was conveniently fabricated by screen-printing with a covalent organic polymer of viologen (COP 2+ ) on the surface of cotton fabric, which was endowed with ammonia sensing, photochromic and thermochromic capabilities. The COP 2+ coated fabric (CCF) were characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The coating treatment endowed the fabric with fast response to ammonia gas, ultraviolet light and heat without compromising its breathability, flexibility, and comfortability. The color of CCF turned from yellow to green instantly when exposed to ammonia gas and quickly returned yellow when removed from the stimulus. The reversible color transition process can also be induced by UV light (exposure for 10 s) or heat (110 °C) and is cyclable. This durable multi-responsive textile has great potential to be used as flexible sensor for environmental monitoring. Graphic abstract
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 10
·10715-10728
·
IF 3.056
Chen Jingda,Liang Qianwei,Ploychompoo Sittipranee,Luo Hanjin
A novel functional rGO aerogel was synthesized by a facile hydrothermal method. In this process, graphene oxide (GO) was used as the precursor and oxidant to synthesize the aerogels. Ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) and pyrrole monomer (reducing agent) were selected to use as hole scavenger and nitrogen sources. The obtained EDTA-2Na/polypyrrole (Ppy)/rGO aerogel (EPGA) has a high adsorption capacity for Cr(VI) anions, and the maximum adsorption capacity reached 361 mg/g at 298 K at pH of 2. In addition, EPGA exhibited a good ability to selectively remove Cr(VI) anions under the effect of coexisting ions (Cl − , NO 3 − , SO 4 2− , PO 4 3− , Ni + , Cu 2+ , Zn 2+ , and Cd 2+ ) and good regeneration ability. The kinetics process and adsorption isotherm can be fitted well with the pseudo-second-order kinetic model and Freundlich isotherm model, respectively. The removal mechanism involved electrostatic interaction, reduction, ion exchange, and chelation process. This work provides a simple and environmentally friendly synthetic route for EPGA, which will be a potential candidate for efficient removal Cr(VI) anions from industrial wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 2
·1-8
·
IF 6.232
Chen Lili,Xu Hui,Wang Li,Li Yong,Tian Xike
A novel ratiometric fluorescent probe for the determination of oxytetracycline (OTC) was developed. The method is based on the use of adenosine monophosphate/Eu(III) nanoscale coordination polymers doped with carbon dots (CDs) (CD@AMP/Eu NCPs). These were fabricated by self-assembly of Eu 3+ and AMP on the surface of CDs containing large amounts of hydroxyl and carbonyl groups. Under the excitation at 310 nm wavelength, the doped NCPs display strong pink emission of Eu 3+ at 615 nm and blue emission of the CDs at 430 nm on exposure to OTC. The ratio of fluorescence intensity (F 615 /F 430 ) of such NCPs displays excellent linear relationship with OTC concentration ranging from 0.2 to 60 μM and the limit of detection (LOD) is 25 nM (3σ). The doped NCPs were evenly immobilized on common filter paper to prepare a visual ratiometric probe for the determination of OTC. Assisted by a digital camera with an APP color detector, the paper-based test strip was applied for the quantitative determination of OTC with a LOD of 0.5 μM and a wide linear scope of 1–100 μM. The method was applied to the determination of OTC in milk samples.
Schematic representation of the principle for oxytetracycline (OTC) determination using carbon dots (CD)@adenosine monophosphate (AMP)/Europium (Eu 3+ ) paper-based ratiometic probe.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 9
·1-10
·
IF 5.833
Guo Ping,Yuan Bao-Yan,Yu Yun-Yan,Zhang Jun-Hui,Wang Bang-Jin,Xie Sheng-Ming,Yuan Li-Ming
The fascinating framework structures and unique properties of chiral covalent organic frameworks (COFs) make them promising candidates as novel separation medium for high-performance liquid chromatography (HPLC). However, the irregular morphology, inhomogeneous particle size, and low density of conventional COF particles will lead to a low column efficiency, undesirable chromatographic peak shape, and high column backpressure of such COF-packed columns. In this work, a chiral COF CTpBD was synthesized by the Schiff base reaction between benzidine (BD) and chiral organic monomer CTp obtained through the reaction of 1,3,5-triformylphoroglucinol (Tp) and (+)-diacetyl-L-tartaric anhydride ((+)-Ac-L-Ta). The chiral COF CTpBD was immobilized on the surface of amino functionalized silica (SiO 2 -NH 2 ) by an in situ growth approach to prepare the chiral COF core-shell microsphere composite CTpBD@SiO 2 , which was used as a novel chiral stationary phase (CSP) for HPLC enantioseparation. Various kinds of racemates were separated on the CTpBD@SiO 2 -packed column with a low column backpressure (8–11 bar). Some effects such as the analyte mass and column temperature on the HPLC enantioseparation have been studied in detail. The fabricated CTpBD@SiO 2 -packed column exhibited high column efficiency (e.g., 16,800 plates m −1 for atenolol), high enantioselectivity, and good reproducibility toward various racemates. The highest resolution value, retention factor, and separation factor reach to 2.11, 2.85, and 3.73, respectively. The relative standard deviations (RSD) of peak area, peak height, half-peak width, and retention time of atenolol were all below 3.0%. Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 152
·期 4
·1182-1193
·
IF 3.186
Shi Kaiyu,Guo Liying,Zheng Rongrong,Wang Haiyue,Chen Yanming
Five kinds of diacid comprising ionic liquid catalyst [HO 3 S–(CH 2 ) 4 -mim]Cl–MCl x ] were prepared, and their chemical structure, thermal stability and acidity were tested and analyzed. The performance evaluation of catalysts was carried out, and the process parameters were optimized. The cycling stability of the catalysts was investigated. Then, the catalytic degradation of polyethylene terephthalate (PET) was studied, and used mineral water bottles as an example. The chemical structure and molecular weight of the degradation product terephthalic acid bis(2-hydroxyethyl) ester (BHET) were analyzed. The results showed that among the catalysts synthesized, [HO 3 S–(CH 2 ) 4 -mim]Cl–FeCl 3 had the great catalytic performance and good thermal stability. According to the thermal gravimeter analysis, the decomposition temperature of the diacid ionic liquid catalyst ranges from 400 to 560 °C, while the degradation reaction temperatures in this paper are all below 250 °C, so that it has good thermal stability. At 190 °C, the PET alcoholysis rate reached 98.7% and the BHET yield reached 95.5% for 6 h, and the highest catalytic activity could still be maintained after 6 cycles, which indicate that the catalyst has excellent performance for degrading PET, and will have a great application prospect. Graphic Abstract
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 29
·16612-16622
·
IF 4.22
Wang Xuquan,Li Yang,Wang Fei,Xu Baoqiang,Yang Bin,Tian Yang
Sodium gadolinium molybdate (Na 0.5 Gd 0.5 MoO 4 ) powder as a new photocatalyst was prepared using GdCl 3 ·6H 2 O, H 2 NCSNH 2 and Na 2 MoO 4 ·2H 2 O as raw materials by hydrothermal approach. The as-synthesized products were characterized with XRD, FESEM, XPS, Raman, FTIR, BET surface area analysis, UV–Vis absorption spectra and PL spectroscopy, respectively. The photocatalytic performance of Na 0.5 Gd 0.5 MoO 4 catalysts was assessed using the photocatalytic degradation of rhodamine B (RhB) at room temperature under visible light. The Na 0.5 Gd 0.5 MoO 4 catalyst exhibited enhanced photoability as the Gd 3+ ions increase. The excellent photocatalytic performance for photocatalysts arise from the separation and migration of the electron–holes pairs in the structure and the narrow band gap energies resulting in the visible absorption ability’s improvement. Additionally, the h + was discovered to be the most significant reactive group for RhB photodegradation and the possible photocatalytic mechanism was also devised.
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 8
·3543-3551
·
IF 2.817
Zhang Chen,Wang Qing,Zhang Wanqi,Li Xiang,Zhu Zerui,Zhang Chenlei,Xie Aijuan,Luo Shiping
Co 3 O 4 -Ni-MOF composite was successfully prepared by solvent-thermal method and then was combined with acidified multi-walled carbon nanotubes (MWCNTs); the resulting Co 3 O 4 -Ni-MOF/MWCNTs hybrid was applied in supercapacitor and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscope (SEM). The electrochemical tests including cyclic voltammetric (CV), galvanostatic charge and discharge (GCD), electrochemical impedance spectroscopy (EIS), and cycle life were also performed to investigate the supercapacitor properties of the as-prepared materials. The experimental results show that when the molar ratio of metal oxide material and Ni-MOF material is 1:1, Co 3 O 4 -Ni-MOF material displays better electrochemical performance. As the mass ratio of Co 3 O 4 -Ni-MOF and MWCNTs is 1:1, Co 3 O 4 -Ni-MOF/MWCNTs hybrid exhibits lower Rct value, higher cyclic capacitance stability, and better supercapacitor performance. Therefore, Co 3 O 4 -Ni-MOF/MWCNTs hybrid as an electrode material has a relatively ideal application prospect in terms of supercapacitor materials. Graphical abstract
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）