FUEL
·
2024
·
IF 6.7
Gongcheng Sun,Wan Chen,Yaoying Li,Subing Fan,Junmin Lv,Tiansheng Zhao
The hydroformylation reaction is very important in industry. However, the leaching of the noble metal Rhodium (Rh) and the separation of homogeneous catalyst have always been difficult problems to solve. And even heterogeneous Rh-base catalyst was developed to solve the separation problem, the serious Rh losing is still hard to avoid. In this work, heterogeneous encapsulated Rh@NaX was prepared by using one-step synthesis method and used as catalyst without reduction in 1-hexene hydroformylation reaction. Rh@NaX catalyst exhibited outstanding catalytic performance. When directly complexed with ligand triphenylphosphine (PPh 3 ), it achieved high heptanal yield of 97.53 %, high n/i ratio of 2.59 and high TOF of 6588 h −1 . Interestingly, encapsulated catalyst exhibited higher recycling stability and much lower Rh leaching compared to impregnated catalyst. In addition, in situ XPS and DRIFT analyses were conducted to elucidate the reduction process of Rh and the reaction pathway.
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高影响因子
LIQUID CRYSTALS
·
2018
·
IF 2.636
Liyuan Ren,Longyan Duan,Qiang Weng,Pei Chen,Yafei Hou,Aiai Gao,Xinbing Chen,Zhongwei An
A series of 1-methyl-1H-benzimidazole-based compounds, 2-(4ʹ-alkoxy-1,1ʹ-biphenyl-4-yl)-1-methyl- 1H-1,3-benzimidazole derivatives (nPPMx-M) with terminal hydrogen, methyl and nitro moieties (coded as nPPMH-M, nPPMM-M and nPPMN-M, respectively), were prepared and their structures were characterised. The compounds display enantiotropic smectic mesophases for hydrogen and methyl terminated compounds (nPPMH-M and nPPMM-M), and enantiotropic nematic mesophases for nitro terminated compounds (nPPMN-M) with short alkoxy chain below than 10 carbon atoms, where the mesophase ranges are 24–72°C and 74–104°C on heating and cooling processes for nPPMH-M, 90–119°C and 110–135°C for nPPMM-M, and 102–129°C and 113–207°C for nPPMN-M, respectively. It is noted that the compounds nPPMx-M exhibit much lower melting points and much wider mesophase range both in heating and cooling than non-1-methyl substituted analogs, which are ascribed to the disruption of hydrogen bonding among the molecules caused by methyl substitution at 1-position of benzimidazole. Meanwhile, among the compounds nPPMx-M, much wider mesophase ranges are obtained for nPPMM-M and nPPMN-M, indicating a much high mesophase stability for the compounds bearing terminal moiety (CH3 and NO2).
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yirui Zhao,Hongshun Hao,Jiaqi Zhong,Gongliang Zhang,Jingran Bi,Shuang Yan,Feng Hong,Hongman Hou
Foodborne pathogens are the main factors causing food poisoning, and it is of great significance to develop novel nanocomposites to obtain efficient and stable photothermal-assisted photocatalysts for killing foodborne pathogens. In this paper, Z-type heterojunction WO 3 /TpPa-1 with a core-shell structure was constructed by in-situ synthesis, and the Nb 2 CT x was used as a co-catalyst to obtain an efficient ternary composite WO 3 /TpPa-1/N-Nb 2 CT x . Compared to the monomers, the ternary composites improved light trapping, interfacial separation effectiveness, and the mobility of photogenerated carriers. The WO 3 /TpPa-1/15% N-Nb 2 CT x has the best sterilization efficiency of 99.69% under visible-infrared light irradiation for 30 min. The construction of WO 3 /TpPa-1/N-Nb 2 CT x promoted the separation of electron and hole pairs, which improved the electron transport efficiency and the generation of reactive oxygen species. In addition, the excellent photothermal effect of Nb 2 CT x improves the sterilization performance of WO 3 /TpPa-1/N-Nb 2 CT x . The WO 3 /TpPa-1/N-Nb 2 CT x has a broad application prospect in photothermal-assisted photocatalytic sterilization.
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Xuzhao Yang,Jun Wang,Yun Fang
A novel asymmetrical gemini ionic liquid, 1-(3-(trimethylammonio)prop-1-yl)-3-methylimidazolium bis(dicyanamide) ([N 111 C 3 MIM][N(CN) 2 ] 2 ), was synthesized and characterized by 1 H NMR, 13 C NMR. Thermal stability of [N 111 C 3 MIM][N(CN) 2 ] 2 was investigated through thermogravimetric analysis under pure nitrogen atmosphere. Heat capacity of pure [N 111 C 3 MIM][N(CN) 2 ] 2 was measured using differential scanning calorimetry in the temperature range 298.15–423.15 K and enthalpy H T -H 298.15K , and entropy S T -S 298.15K were obtained. Densities and viscosities were measured for the binary system of [N 111 C 3 MIM][N(CN) 2 ] 2 and isopropanol (IPA) over the entire range of mole fractions at various temperatures from 283.15 to 333.15 K under the pressure of 0.101 MPa. Moreover, the excess molar volumes ( V m E ) and the viscosity deviations (Δ η ) for the binary mixtures were determined and well fitted to the Redlich−Kister polynomials. The negative values of V m E and Δ η result from strong self-association and weak hydrogen bonding interaction between the molecules of [N 111 C 3 MIM][N(CN) 2 ] 2 and IPA. Excess Gibbs energy of activation (Δ G *E ) of viscous flow for the present binary mixtures were also calculated. Results have been discussed in terms of molecular interactions and structures.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Kiran Gupta,Baoling Yuan,Chen Chen,Naresh Varnakavi,Ming-Lai Fu
Novel composite of immobilized layered K 2x Mn x Sn 3−x S 6 (x = 0.5–0.95) (KMS-1) on the surface of reduced graphene oxide (r-GO), KMS-1/r-GO (KGO), has been fabricated by employing hydrothermal technique and used for the removal of radioactive Cs + and Sr 2+ ions from aqueous solutions. The KGO was characterized thoroughly with different characteristic techniques and found that the laminar KMS-1 nanoplate were immobilized on the surface of r-GO nanosheets, forming a highly porous stacked structure. Batch studies have been done for obtaining optimal experimental parameters and investigating the effect of adsorption time, initial concentration of pollutant, pH of solution, temperature, and competing anions on the removal properties. At room temperature, the maximum adsorption capacity of KGO was 338.18 mg·g −1 and 220.12 mg·g −1 for both Cs + and Sr 2+ , respectively. Langmuir isotherm and pseudo-second-order kinetic models were fitted well with experimental data of removed Cs + and Sr 2+ . Adsorption showed good selectivity of composite towards Cs + and Sr 2+ in the presence of co-existing ions (Ca 2+ and Mg 2+ ). The proposed adsorption mechanism involved ion exchange through the presence of K + ions in KMS-1 and formation of surface ionic interactions between r-GO and ions through COO X or S X (X denoted Cs + and Sr 2+ ). This study highlighted the facile applicability of novel material KGO and could be used as a new adsorbent for the removal of radioactive ions.
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高影响因子
Molecular Medicine Reports
·
2018
·Vol. 18
·期 2
·1789-1797
·
IF 1.922
Jian‑Xia Shi,Qin Huang
Glucagon‑like peptide‑1 (GLP‑1) is a gut incretin hormone that is considered to be a promising target for the treatment of patients with type 2 diabetes. However, the mechanisms underlying the protective effects of GLP‑1 on diabetic nephropathy are yet to be fully elucidated. Sirtuin (SIRT)1 encodes a member of the SIRT family of proteins that serves an important role in mitochondrial function and is reported to be associated with the pathogenesis of chronic kidney disease. The present study treated mouse podocytes with various concentrations of D‑glucose to establish a high glucose (HG)‑induced model of renal injury. The results of a 2',7'‑dichlorodihydrofluorescein diacetate assay, Annexin V/propidium iodide staining and ELISA demonstrated that treatment of podocytes with HG significantly enhanced the production of reactive oxygen species (ROS), promoted cell apoptosis and increased the secretion of proinflammatory cytokines, respectively. The cytokines increased following HG treatment included tumor necrosis factor‑α, interleukin (IL)‑1β and IL‑6. Notably, treatment with GLP‑1 attenuated HG‑induced increases in ROS production and podocyte apoptosis, which may occur via downregulation of the expression of caspase‑3 and caspase‑9, and increased expression of nephrin, podocin and SIRT1, as determined by reverse transcription‑quantitative polymerase chain reaction and western blot analysis. Treatment with GLP‑1 led to protective effects in podocytes that were similar to those of resveratrol. Furthermore, SIRT1 knockdown using short hairpin RNA significantly enhanced the expression of caspase‑3 and caspase‑9 in mouse podocytes, compared with normal mouse podocytes. SIRT1 knockdown with or without GLP‑1 administration significantly decreased the expression of caspase‑3 and caspase‑9 in mouse podocytes, compared with SIRT1 knockdown mouse podocytes. In conclusion, the results of the present study indicated that GLP‑1 may be a promising target for the development of novel therapeutic strategies for HG‑induced nephropathy, and may function through the activation of SIRT1.
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PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2017
·
IF 2.603
Tingting Liang,Shun Liu,Fang Wang,Jiamei Gu,Yang Lu,Weike Chen,Cunyu Li,Yunfeng Zheng,Guoping Peng
A specific, sensitive, rapid, precise, and reliable UPLC–MS/MS-based method was designed for the first time for the simultaneous determination of 1-deoxynojirimycin (DNJ) and N-methyl-1-deoxynojirimycin (N-CH 3 -DNJ) in rat plasma. Miglitol was served as the internal standard (IS). An MN-NUCLEODUR HILIC column was assessed to separate the two compounds by isocratic elution using acetonitrile : water with 0.05% formic acid and 6.5 mM ammonium acetate (72:28, v/v) at a flow rate of 0.4 mL/min. A triple quadrupole mass spectrometer was operated in the positive ionization mode using multiple reaction monitoring (MRM), and it was employed to determine transitions of m / z 164.1 → 110.1, 178.1 → 100.1, and 208.1 → 146.1 for DNJ, N-CH 3 -DNJ, and IS, respectively. The method of the two constituents was validated and the results were acceptable. The absolute bioavailability of DNJ and N-CH 3 -DNJ in rats was 50 ± 9% and 62 ± 24%, respectively. The method was then successfully used for the first time to study the pharmacokinetic behavior and absolute bioavailability of DNJ and N-CH 3 -DNJ in rats after intravenous (10 mg/kg) and oral administration (80 mg/kg). The results of this study might provide more information on preclinical pharmacokinetics and a solid basis for assessing the clinical efficacy of DNJ and N-CH 3 -DNJ.
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PubMed
高影响因子
CHROMATOGRAPHIA
·
2024
·Vol. 87
·期 6
·407-418
·
IF 1.2
Hong Lei,Mao Huihui,Huang Xiaowei,Fu Xinyang,Lin Yanfang
To analyze 1-methyladenosine (m1A) and 1-methylinosine (m1I) in urine samples obtained from patients with breast cancer and healthy people, we used magnetic dispersive solid-phase micro-extraction (MDSPME) combined with high-performance liquid chromatography. The structure and morphology of magnetic nanoparticles, Fe 3 O 4 @GO, were investigated by FT-IR, XRD, TEM, and TGA. m1A and m1I in urine samples were enriched by the solid phase micro-extraction technology of Fe 3 O 4 @GO. Several parameters affecting the extraction efficiency, including adsorption time, pH, ionic strength, mass of adsorbent, extraction time, eluent solvent, elution time, and elution temperature, were researched and optimized. Under the optimized conditions, the corresponding linearity range of the two analytes showed a good linearity ( r 2 > 0.9998) and significant addition recoveries ranging from 88.50 to 109.38%, while the limit of detection was between 0.10 and 0.11 ng/mL. The enrichment factors of m1A and m1I were 108 and 134, respectively. The method was simple, sensitive, and reliable for the detection and purification with good detection limit, and it was suitable for the detection of m1A and m1I in urine samples. In addition, the analysis of modified nucleosides is of great value for the early diagnosis of patients with breast cancer.
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RARE METALS
·
2025
·
IF 11
Li Bo-Kang,Fu Lv-Ping,Gu Hua-Zhi,Huang Ao,Yang Shuang
High-temperature industries, as the primary consumers of energy, are greatly concerned with energy savings. Designing refractory linings with low thermal conductivity to reduce heat dissipation through high-temperature furnace linings is a critical concern. In this study, a series of novel entropy-stabilized spinel materials are reported, and their potential applications in high-temperature industries are investigated. XRD and TEM results indicate that all materials possess a cubic spinel crystal structure with the \(Fd\overline{3} m\) space group. Furthermore, these materials exhibit good phase stability at high temperatures. All entropy-stabilized spinel aggregates demonstrated high refractoriness (> 1800 °C) and a high load softening temperature (> 1700 °C). The impact of configurational entropy on the properties of entropy-stabilized spinel materials was also studied. As configurational entropy increased, the thermal conductivity of the entropy-stabilized spinel decreased, while slag corrosion resistance deteriorated. For the entropy-stabilized spinel with a configurational entropy value of 1.126 R , it showed good high-temperature stability, reliable resistance to slag attack, and a low thermal conductivity of 2.776 W·m −1 ·K −1 at 1000 °C. Graphical abstract
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CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Huan Pei,Luyong Zhang,Huanhuan Cheng,Shibin Wang,Zhihua Yang,Fangfang Zhang,Shilie Pan
Four hydroxyfluorooxoborates, α-K2[B3O3F4(OH)] (I), β-K2[B3O3F4(OH)] (II), Cs(NH4)3[B3O3F4(OH)]2 (III), and RbCs5[B3O3F4(OH)]3 (IV), with identical fundamental building block (FBB) [B3O3F4(OH)]2–, were obtained successfully and characterized comprehensively. A phase transition between I and II was detected, which led to a space group evolution from centrosymmetric to noncentrosymmetric. The F– and OH– substitution effect was studied based on II and its hydroxyborate derivative K2[B3O3(OH)5], which reveals the corresponding changes in the band gap and the nonlinear optical properties. In addition, the cationic-size effect on the arrangement of the [B3O3F4(OH)]2– FBBs and the birefringent properties were discussed for the title compounds. This study contributes to the advancement of structural chemistry and sheds some light on the structure–property relationship studies of hydroxyfluorooxoborates.
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高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Yunchuan He,Yang Gao,Qiulin Chen,Hainuo Hong,Jiamei Geng,Ying Zhou,Zeng-Rong Zhu
Analyzing the role of herbivore-induced volatiles in plant–herbivore–natural enemy interactions is crucial for developing integrated pest management strategies. This study identified 1-octen-3-ol and 2-ethyl-1-hexanol as the primary C8 volatiles induced by Megalurothrips usitatus infestation in cowpea flowers. The concurrent accumulation of glycosides of these volatiles, along with the upregulation of LOX and HPL expression, suggested that the increased emissions of 1-octen-3-ol and 2-ethyl-1-hexanol result from enhanced de novo biosynthesis regulated by herbivore-induced jasmonate. 1-Octen-3-ol exhibited strong repellent effects against M. usitatus and attracted its natural enemy, Orius similis, at low concentrations. By contrast, 2-ethyl-1-hexanol repelled M. usitatus but did not exert a significant attractant effect on O. similis. These volatiles prime the defense mechanism in cowpea plants against M. usitatus, which highlight their promising role in controlling thirp populations and enhancing cowpea cultivation.
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PubMed
高影响因子
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
·
2023
·Vol. 238
·期 3
·471-473
·
IF 0.3
Li Liu,Huan-Mei Guo,Li-Li Liu,Xin-Ru Qian
C 27 H 26 N 9 O 10 Pr, monoclinic, P 2 1 / c , a = 13.2280(12) Å, b = 5.5628(5) Å, c = 41.140(3) Å, β = 105.109(2)°, V = 2922.6(4) Å 3 , Z = 4, R gt
( F ) = 0.0426, w R ref
( F
2 ) = 0.0803, T = 298.15 K.
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