ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
·
2023
·Vol. 238
·期 4
·799-800
·
IF 0.3
Yu-Pei Xia
C 4 H 13 Cl 2 N 5 , monoclinic, P 2 1 (no. 4), a = 7.1868(6) Å, b = 5.8408(4) Å, c = 12.6534(11) Å, β =
105.134
(
2
)
∘
, V = 512.73(7) Å 3 , Z = 2, R
gt ( F ) = 0.0354, wR
ref ( F
2 ) = 0.0961, T = 298 K.
研究领域:
化学晶体学
·
材料科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Songlin Li,Chen Wang,Zhaohui Lei,Shanfu Sun,Jie Gao,Pengfei Cheng,Hai Wang
A deep understanding of the relationship between the properties and structure of transition metal oxide semiconductor gas sensors is essential for optimizing sensor design. Comparing and analyzing the sensing properties of nanomaterials with different morphologies and crystal facets by combining the experiment analysis and the density functional theory (DFT) calculations could identify and understand the corresponding mechanisms at the atomic or ionic level. Here, grown Co 3 O 4 nanosheet (Co 3 O 4 -NS) with exposed (1 1 1) facets, and Co 3 O 4 nanorods (Co 3 O 4 -NR) with exposed (1 1 0) facets on alumina ceramic tubes were prepared and studied in sensing ethanol. The adsorption characteristics of ethanol on the sensor surface were analyzed by DFT calculation. The results demonstrated that the sensing performance of Co 3 O 4 -NR was superior to Co 3 O 4 -NS. The adsorption of hydroxyl groups in ethanol was better than the methyl groups on the surface. The oxygen and hydrogen atoms from the hydroxyl groups in ethanol had the lowest adsorption energies (E ads = −3.44 eV) when they interact with the Co atom and the indirectly adjacent low-coordinate oxygen atoms on the (1 1 0) surface, respectively. The synergistic adsorption of target gases by exposed surface atoms induced superior sensing properties of the material.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
BIOCATALYSIS AND BIOTRANSFORMATION
·
2021
·
IF 2.181
Lu Dong,Shujuan Qi,Jianwei Jia,Yun Zhang,Yunfeng Hu
Bacillus sp. DL-1 was isolated from the deep sea of the Western Pacific Ocean and behaved very good resistance to NaCl. The extracellular proteases of Bacillus sp. DL-1 were found to exhibit excellent enantioselectivity for the kinetic resolution of (±)-1-phenylethyl acetate. To improve the stability of the enzyme, the immobilized extracellular proteases were preparated by using 60 g kieselguhr and 1-L crude fermentation broth containing extracellular proteases of Bacillus sp. DL-1, shaking at 25 °C, 200 r/min for 10 h. Every gram of kieselguhr adsorbed 25.7 mg extracellular protease and the enzymatic activity recovery was 79.86%. The immobilized proteases preserved about 35.8% of its activity after 6 repeated uses, which were also used as biocatalyst to asymmetrically hydrolyse (±)-1-phenylethyl acetate for the preparation of (R)-1-phenylethanol and (S)-1-phenylethyl acetate with high optical purities. The effects of pH, temperature, enzyme concentration, substrate concentration, reaction time and additives (metal ions/surfactants) on the resolution were investigated by single factor experiments. Under the optimal reaction conditions (10 mM (±)-1-phenylethyl acetate, 40 mg/mL immobilized extracellular proteases, pH 7.5 (Tris-HCl), 5% (v/v) methanol and 45 °C for 2 h), (R)-1-phenylethanol was generated with the e.e.p being > 97%, and the yield being 53%, respectively. Analogously, under the optimal reaction conditions (10-mM (±)-1-phenylethyl acetate, 360 mg/mL immobilized extracellular proteases, pH 6.0 (PB), 5% (v/v) DMSO and 35 °C for 1.5 h), (S)-1-phenylethyl acetate was generated with the e.e.s being over 99% and the yield being 79%, respectively. Compared with the extracellular proteases from Bacillus sp. DL-2, the immobilized extracellular proteases from Bacillus sp. DL-1 exhibited higher hydrolytic activity and could asymmetrically hydrolyse (±)-1-phenylethyl acetate by using higher substrate concentrations, shorter reaction times to obtain higher yields. Notably, the extracellular proteases of Bacillus sp. DL-1 were demonstrated to behave the same enantio-preference as those of most other reported esterases/lipases. Proteases from deep-sea Bacillus sp. DL-1 are promising biocatalysts for the synthesis of valuable chiral chemicals.
研究领域:
生物催化
·
酶学
·
微生物学
·
有机化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xingxing Cui,Hongyang Lyu,Yongming Chai,Bin Liu,Dongfeng Zhao,Chenguang Liu
The strong acidity on the external surface of ZSM-5 is a primary factor resulting in the low BTX selectivity and catalyst deactivation during the olefin aromatization. In this study, a membrane-restricted Silicalite-1@ZSM-5 core–shell structured catalytic catalyst was designed and constructed for 1-hexene aromatization using a hydrothermal coating method. TEM and NMR results confirmed the complete coverage of Silicalite-1 on the surface of ZSM-5, with a shell thickness of 50 nm. The further reaction of the TIPB (1,3,5-triisopropylbenzene) molecular probe reactions demonstrated the passivation of the acid sites on ZSM-5 external surface. The inert shell layer passivated the acid sites on the external surface, thereby suppressing the isomerization of PX and the side-chain alkylation reaction of light aromatics. Compared to ZSM-5, the Silicalite-1@ZSM-5 catalyst exhibited a 37.15 % increase in BTX selectivity, a 58.65 % increase in PX selectivity, significantly reduced coke deposition, and demonstrated better stability. This strategy of in-situ epitaxial growth of inert shell layers holds significant promise for enhancing the selectivity of shape-selective catalysts and extending catalyst lifetime.
研究领域:
催化化学
·
材料科学
·
石油化工
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DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Yangrui Wang,Mengtong Sun,Xiaoling Cui,Yongyue Gao,Xinran Lv,Jianrong Li,Fengling Bai,Xuepeng Li,Defu Zhang,Kai Zhou
Vibrio harveyi is one of the main pathogenic bacteria in the aquaculture industry, and quorum sensing (QS) plays key role in its pathogenicity. Previous studies have demonstrated that a metabolite with protein properties isolated from Lactococcus lactis LY3-1 showed anti-QS activity against V. harveyi . In this study, this metabolite of L. lactis LY3-1 was identified as peptide LQLY3-1, with a 1.09 kDa molecular mass, which was purified via ethyl acetate extraction followed by ultrafiltration, Sephadex G25 gel chromatography, and high-performance liquid chromatography. Its amino acid sequence was ALSLVKIHGR, as demonstrated by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Crude extracts of peptide LQLY3-1 at sub-minimum inhibitory concentrations inhibited V. harveyi biofilm formation and the production of virulence factors, including exopolysaccharide, proteolytic enzymes, hemolysin, gelatinase, and motility, albeit without inhibiting bacterial growth. Scanning electron microscopy images indicated that the crude extracts of peptide LQLY3-1 disrupted the integrity of the V. harveyi biofilm. Additionally, molecular docking analysis indicated that peptide LQLY3-1 could competitively bind to the LuxN receptor protein with its natural ligand N-octanoyl- l -homoserine lactone, thereby blocking the signal transmission of the QS system. These results suggested that peptide LQLY3-1 can be used as a promising QS inhibitor to control V. harveyi pathogenicity.
研究领域:
微生物学
·
海洋生物学
·
水产养殖
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2016
·
IF 2.74
Xue Wang,Mingjie Wang,Zhiyun Chen,Xiaoyi Tao,Weiguo Shen
The liquid-liquid equilibrium data and the specific heat capacities for the binary room temperature ionic solution {1-butanol + 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide} have been reported. The corresponding critical exponents β and α were obtained and found to be well coincided with the 3D-Ising criticality. The critical complete scaling theory was applied to successfully describe the asymmetric behavior of the diameter of the coexistence curve with the consideration of the heat capacity related term. The large values of the reduced critical density, the reduced critical temperature and the critical amplitude related to the heat capacity were deduced, which indicated a solvophobic criticality of the studied system.
研究领域:
物理化学
·
材料科学
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产品关联
DOI
高影响因子
ChemCatChem
·
2022
·Vol. 14
·期 7
·e202101728
·
IF 5.497
Shiqing Wang,Xiaocheng Lan,Boyang Liu,Babar Ali,Tiefeng Wang
Graphical Octylamine synthesis : Ni x Fe 1 /Al 2 O 3 was used as catalyst for 1-octanol amination and provided the highest yield among the reported nonprecious metal catalysts. The generation of Ni−FeO x interactions provided sufficient Fe 2+ /Fe 3+ −O 2− sites for the activation of 1-octanol. Meanwhile, the cooperation between Ni site and Lewis acid-base pairs significantly enhanced the amination of 1-octanol to 1-octylamine. The synthesis of 1-octylamine, a primary platform molecule, remained a great challenge in catalysis. In this work, Ni x Fe 1 /Al 2 O 3 was used for direct amination of 1-octanol to 1-octylamine. Catalyst evaluation indicated that the promotion effect of Fe/Ni ratio on the catalytic amination activity followed a volcano curve while the selectivity to 1-octylamine was positively correlated with the Fe loading. Compared with the Ni/Al 2 O 3 catalyst, the amination activity was increased by 2.8 times by optimizing the Fe/Ni ratio to 0.33, and the selectivity to 1-octylamine was increased from 84.0 % to 96.3 % when increasing the Fe/Ni ratio from 0 to 1. Based on catalyst characterizations, the good performance of Ni x Fe 1 /Al 2 O 3 was ascribed to the combined modification effect of the NiFe alloy and Ni−FeO x interface. The FeO x species enriched on the Ni particle surface provided sufficient Fe 2+ /Fe 3+ −O 2− sites for the activation of 1-octanol, and the cooperation between Ni sites and Lewis acid-base pairs enhanced the amination of 1-octanol to 1-octylamine. This work sheds new light on the design of Ni-based catalysts without using a noble metal for primary amine preparation.
研究领域:
催化
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化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Communications Biology
·
2023
·Vol. 6
·期 1
·1-13
·
IF 5.9
Sun Weijia,Li Yuheng,Li Jianwei,Tan Yingjun,Yuan Xinxin,Meng Haoye,Ye Jianting,Zhong Guohui,Jin XiaoYan,Liu Zizhong,Du Ruikai,Xing Wenjuan,Zhao Dingsheng,Song Jinping,Li Youyou,Pan Junjie,Zhao Yunzhang,Li Qi,Wang Aiyuan,Ling Shukuan,Dai Rongji,Li Yingxian
Mechanical force loading is essential for maintaining bone homeostasis, and unloading exposure can lead to bone loss. Osteoclasts are the only bone resorbing cells and play a crucial role in bone remodeling. The molecular mechanisms underlying mechanical stimulation-induced changes in osteoclast function remain to be fully elucidated. Our previous research found Ca 2+ -activated Cl − channel Anoctamin 1 (Ano1) was an essential regulator for osteoclast function. Here, we report that Ano1 mediates osteoclast responses to mechanical stimulation. In vitro, osteoclast activities are obviously affected by mechanical stress, which is accompanied by the changes of Ano1 levels, intracellular Cl − concentration and Ca 2+ downstream signaling. Ano1 knockout or calcium binding mutants blunts the response of osteoclast to mechanical stimulation. In vivo, Ano1 knockout in osteoclast blunts loading induced osteoclast inhibition and unloading induced bone loss and. These results demonstrate that Ano1 plays an important role in mechanical stimulation induced osteoclast activity changes.
研究领域:
生物学
·
生物力学
·
细胞生物学
·
骨生理学
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产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2024
·Vol. 16
·期 21
·e202401010
·
IF 3.8
Ziwei Wu,Han Sun,Quanzheng Deng,Lu Han,Penggang Lv,Haijun Chen,Hongchang Duan,Kake Zhu
Graphical Mono-quaternary 1-(1-methylpropyl)-4-aza-1-azoniabicyclo[2.2.2]octane hydroxide is proposed to direct the Faujasite-to-Chabazite inter-zeolite conversion to generate 35–258 nm CHA crystals with Si/Al ratio of 7.2. The Cu-CHA zeolite exhibits superior hydrothermal stability and catalytic performance in standard NH 3 -SCR process. Cu-exchanged chabazite zeolite is the state-of-the-art used on-board catalyst for NO x selective reduction by ammonium (NH 3 -SCR), and the zeolite is currently generated in the presence of N , N , N -trimethyl-1-adamantylammonium hydroxide, serving as organic structure-directing agent (OSDA). The expensiveness of this OSDA increases the catalyst production cost, while its low degradability brings about environmental concerns in post treatment of waste water. Here, a new type OSDA, 1-(1-methylpropyl)-4-aza-1-azoniabicyclo[2.2.2]octane hydroxide, is proposed to direct Faujasite-to-Chabazite inter-zeolite conversion and generate chabazite with Si/Al ratio up to 7.2. The obtained zeolite possesses high hydrothermal stability for the high crystallinity, siliceous framework and low concentrations of Si(2Si, 2Al) sites. The Cu-form catalyst exhibits better catalytic performance in standard NH 3 -SCR process for the tiny crystallite size (35–258 nm) and formation of highly dispersed copper sites. The synthesis offers a new type of OSDA to fabricate zeolites and expands the toolkit to regulate their physicochemical properties.
研究领域:
材料科学
·
催化
·
无机化学
·
环境工程
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DOI
高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2015
·Vol. 178
·期 3
·558-575
·
IF 1.735
Liang Jiayuan,Zhang Yun,Sun Aijun,Deng Dun,Hu Yunfeng
A novel microbial esterase BSE01281 identified from the Indian Ocean was cloned, expressed, and functionally characterized. Esterase BSE01281 could enanoselectively resolve (±)-1-phenylethanol and (±)-1-phenylethyl acetate through two types of enzymatic reactions. After the optimization of enzymatic reactions, BSE01281 could efficiently generate ( R )-1-phenylethyl acetate with high enantiomeric excess (>99 %) and high conversion (42 %) after 96 h trans-esterification reactions. Additionally, BSE01281 could also produce ( R )-1-phenylethanol ( e.e . > 99 %) and ( S )-1-phenylethyl acetate ( e.e . > 95 %) at a conversion of 49 % through direct hydrolysis of inexpensive racemic 1-phenylethyl acetate for 8 h. Optically pure ( R )-1-phenylethanol generated from direct enzymatic hydrolysis of racemic 1-phenylethyl acetate by BSE01281 is not easily prepared by dehydrogenases, which generally follow the “Prelog’s rule” and give ( S )-1-phenylethanol instead.
研究领域:
生物化学
·
酶工程
·
合成生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Xingchuan Yang,Huanxin Li,Chunmei Cao,Li Xu,Guoji Liu
Liquid-liquid equilibria (LLE) data for ternary systems of water + 1,6-hexanediol + 1-pentanol/ 3-methyl-1-butanol/ 2-methyl-2-butanol were measured at (293.15, 303.15, 313.15 and 323.15) K under 101.3 kPa. Cloud-point method was applied to determine the solubility curves data. Distribution coefficient and separation factors for 1,6-hexanediol were calculated from the measured tie-line data to evaluate the extraction effect of alcohols on 1,6-hexanediol. The reliability of experimental LLE data were tested by Othmer–Tobias equation and Hand equation, NRTL and UNIQUAC models were applied to correlate the measured data and the calculated results show that both models can fit the experimental data very well.
研究领域:
化学工程
·
热力学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2020
·
IF 3.687
Huan Fu,Luna Ruan,Jianhua Liao,An Pei,Jun Liu,Li Zeng,Kai Yang,Lihua Zhu,Bing Hui Chen
In this report, the Ni/C sample was successfully prepared at room temperature (RT) by depositing nickel related species on carbon black by a chemical liquid reduction method with hydrazine hydrate as reducing agent, Pt/C was synthesized via a wetness impregnation method. And Pt was supported on Ni/C by galvanic replacement reaction to form PtNi/C bimetallic nanocatalyst. By comparing the catalytic performance of different catalysts for 1-nitronaphthalene hydrogenation, it could be found that the PtNi/C bimetallic nanocatalyst showed higher catalytic activity than monometallic nanocatalysts (Pt/C and Ni/C), exhibiting 100 % conversion of 1-nitronaphthalene, 100 % selectivity to 1-naphthylamine and turnover frequency of 194.9 h −1 under mild reaction conditions (40 min, 30 °C, 3.0 MPa H 2 ). The as-prepared catalysts were characterized by XRD, XPS, HAADF-STEM, STEM-EDX mapping and line-scanning, TG, HRTEM and H 2 -TPD, which proved that PtNi/C showed most outstanding catalytic behaviors in 1-nitronaphthalene selective hydrogenation due to high dispersion of platinum, the nanostructure of Pt-on-Ni-on-Ni(OH) 2 and thus synergism effect among Pt, Ni and Ni(OH) 2 .
研究领域:
催化化学
·
材料科学
✓ 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）