CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Long Chen,Yanhua Song,Qiwen Yu,Hao Dong,Chenying Pan,Di Wang,Jun Liu,Xing Chen
Gas sensing requires precise gas detection, hence the need for the development of semiconductors with highly selective and sensitive properties. Herein, different amounts of Tb-doped Fe 2 O 3 nanotubes (NTs) are successfully fabricated for detecting acetone gas using electrospinning followed by calcination at 550 °C. Specifically, the gas sensing investigation indicated that 5% Tb–Fe 2 O 3 NTs to 50 ppm acetone reached 53.2 at 170 °C, which is 13 times higher than that of pure Fe 2 O 3 NTs. In addition, the sensor also displays good selectivity and a low detection limit (200 ppb) for acetone. The significant increase in acetone sensing performance could be ascribed to hollow structures with a high specific surface area and the increase in oxygen vacancies by Tb doping. The proposed Tb-doped Fe 2 O 3 NTs offer an effective strategy for fabricating a highly sensitive acetone sensor, which can work well at a relatively low temperature.
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CRYSTAL RESEARCH AND TECHNOLOGY
·
2022
·Vol. 57
·期 10
·2100243
·
IF 1.599
Chunyu Sun,Xinzhan Wang,Pengfei Qiu,Xuejiao Mou,Wanbing Lu,Xiaoyun Teng,Guangsheng Fu,Wei Yu
Temperature-dependent photoluminescence (PL) properties of high quality cubic phase α-CsPbI 3 nanocrystals are investigated, and thermal transfer from free excitons to trapped excitons is observed. Free exciton recombination is the main origin of the high PL quantum yield (97%) at room temperature. Little change of PL peak energy is observed with decreasing temperature from 280 to 200 K, and it shifts from 1.84 to 1.81 eV in the region of 200 and 80 K. The PL peak intensity decreases with decreasing temperature first and then increases, and the minimum value is observed at 180 K. Two PL bands are obtained by Gaussian fittings in the PL spectra detected at different temperatures, and the high energy band is attributed to the emission of free excitons, while that for the low energy band is related to the transition of trapped excitons. The PL integrated intensity ratio of trapped exciton and free exciton transition increases from 0.18 to 2.10 with decreasing the temperature, which suggests that thermal transfer from free exciton to trapped exciton states leads to the dominant optical emission of trapped exciton recombination in the low temperature region.
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Biomolecules
·
2021
·Vol. 11
·期 9
·1358
·
IF 4.879
Li Liu,Bohao Wang,Sheng Li,Fengyuan Xu,Qi He,Chun Pan,Xiangdong Gao,Wenbing Yao,Xiaoda Song
The activity and function of proteins can be improved by incorporation of non-canonical amino acids (ncAAs). To avoid the tedious synthesis of a large number of chiral phenylalanine derivatives, we synthesized the corresponding phenylpyruvic acid precursors.Escherichia colistrain DH10B and strain C321.ΔA.expΔPBAD were selected as hosts for phenylpyruvic acid bioconversion and genetic code expansion using theMmPylRS/pyltRNACUAsystem. The concentrations of keto acids, PLP and amino donors were optimized in the process. Eight keto acids that can be biotransformed and their coupled genetic code expansions were identified. Finally, the genetic encoded ncAAs were tested for incorporation into fluorescent proteins with keto acids.Keywords:keto acids;biotransform;evolution
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Hai Zhang,Yu-Tong Ye,Jun-Ling Deng,Pei Zhao,Yu-Fen Mao,Zhong-Xiu Chen
α-Amylase plays an important role in food processing and in-vivo digestion. Many biological functions of α-amylase are affected by unfolding. The pre-steady-state rapid unfolding kinetics of α-amylase remains unknown. In this study, the rapid unfolding kinetics of porcine pancreatic α-amylase (PPA) with guanidine hydrochloride (GdmHCl) were investigated by stopped-flow spectroscopy. Structural characterization of PPA by fluorescence spectroscopy, and molecular dynamics simulation showed that the unfolding process of PPA might start from the internal active center, where the β-sheet structure was destroyed, followed by the exposure of hydrophobic amino acid residues. Further research revealed that GdmHCl denaturized PPA not by complexing with PPA. The surrounding H-bond network of water was changed by GdmHCl. This research improves our understanding of the unfolding kinetics of the PPA on the microsecond scale. It also provides the evidence experimentally of the surrounding water contribution to protein denaturization.
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PubMed
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 17
·5859-5867
·
IF 6.119
Yiqing Wei,Huichao He,Chang Liu,Liuqing Yang,Xiaoyong Wang,Aidong Li,Yujie Xiong,Qing Shen,Yong Zhou,Zhigang Zou
The photoelectrochemical (PEC) water oxidation performance of α-Fe2O3 photoanodes is jointly restricted by their high charge recombination and sluggish water oxidation kinetics. Herein, through coupling Ag and CdS nanoparticles with an α-Fe2O3 nanorod film, a new kind of α-Fe2O3/Ag/CdS ternary heterojunction film was constructed and investigated as a photoanode for solar water oxidation. The resultant α-Fe2O3/Ag/CdS photoanode can take full advantages of the α-Fe2O3/CdS heterojunction and the properties of Ag nanoparticles. Specifically, the formation of the α-Fe2O3/CdS heterojunction improves the charge separation and transfer efficiency of the α-Fe2O3 photoanode through band potential differences. Meanwhile, the presence of Ag nanoparticles enlarges the absorption edge of α-Fe2O3/CdS and decreases the electron–hole recombination through their surface plasmon resonance (SPR) effect. In addition, the electrocatalytic properties of Ag nanoparticles could initiate the water oxidation on the α-Fe2O3/Ag/CdS photoanode jointly. As a result, a higher photocurrent density of 3.25 mA cm−2 at 1.23 V vs. RHE was achieved on the α-Fe2O3/Ag/CdS photoanode during water oxidation, which is 2.5 times higher relative to the photocurrent of the α-Fe2O3 photoanode. Furthermore, the onset potential of water oxidation on the α-Fe2O3/Ag/CdS photoanode was negatively shifted about 220 mV relative to the α-Fe2O3 photoanode due to its faster kinetics. With the protection of the amorphous TiO2 layer, the water oxidation activity of the α-Fe2O3/Ag/CdS photoanode can be steadily maintained even after 10 h of reaction at 1.23 V vs. RHE. The present work provides an efficient strategy for the development of α-Fe2O3-based ternary heterojunction photoanodes for solar water oxidation.
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Catalysts
·
2021
·Vol. 11
·期 3
·370
·
IF 4.146
Yue Yang,Xiaochen Liu,Yuanjie Xu,Xing Gao,Yihu Dai,Yu Tang
Hydrodeoxygenation (HDO) is one of the promising catalytic routes for converting biomass derived molecules to high value products. A key step of HDO is the cleavage of an aromatic C–O bond to accomplish the deoxygenation step, however, which is energetically unfavorable. Herein, we report a series of palladium (Pd)-incorporated α-phase of molybdenum carbide (α-MoC) mesoporous composites for enhanced HDO activity of a biomass model molecule, anisole. The catalysts, x%Pd/α-MoC (x% is the molar ratio of Pd/Mo), were investigated by X-ray diffraction (XRD), temperature programmed reduction (TPR), temperature programmed desorption (TPD), Brunauer–Emmett–Teller (BET), Raman, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) techniques. Pd is highly dispersed on α-MoC when x% ≤ 1%, but aggregate to form nanoparticles when x% = 5%. The x%Pd/α-MoC catalysts (x% ≤ 1%) show enhanced HDO activity in terms of turnover frequency (TOF) and apparent activation energy barrier (Ea) compared with α-MoC and β-Mo2C catalysts. The TOF of 1%Pd/α-MoC catalyst at 160 °C is 0.115 h−1and the Ea is 48.2 kJ/mol. Moreover, the direct cleavage of aromatic C–O bond is preferred on 1%Pd/α-MoC catalyst. The enhanced HDO activity is attributed to superior H2dissociation ability by the highly dispersed Pd sites on carbide. This work brings new insights for rational design of the catalyst for selective C–O bond activation.Keywords:hydrodeoxygenation;carbide;palladium;anisole;biomass;C–O bond cleavage
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FOOD HYDROCOLLOIDS
·
2020
·
IF 7.053
Mengting Ni,Xing Hu,Deming Gong,Guowen Zhang
Vitexin, a C-glycosylated flavonoid , is abundant in numerous foods . In this study, vitexin was determined as an uncompetitive α-glucosidase inhibitor and its binding site was different from the active site. It possessed a remarkably higher inhibitory activity than acarbose with its IC 50 value of 52.80 ± 1.65 μM. Interestingly, the combination of acarbose with vitexin showed a strong synergistic inhibition effect. The stable complex between vitexin and α-glucosidase was mainly formed by hydrogen bonds and hydrophobic forces. The presence of vitexin induced a looser conformation of α-glucosidase and decreased its surface hydrophobicity. Computational docking and chemical modification of α-glucosidase found that residues Glu, Asn, Lys, and Thr were essential for the binding course and their importance order was Glu, Asn > Lys > Thr. Molecular dynamics simulation results revealed the molecular mechanism of the interaction between vitexin and α-glucosidase and verified the above experimental results. This work proposed rewarding findings in functional research of vitexin as a potential α-glucosidase inhibitor.
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Food Packaging and Shelf Life
·
2019
·
IF 3.63
Thanakorn Yeamsuksawat,Jun Liang
The aim of this work was to produce the in-situ crosslinking emulsification chitosan film by the casting solution method and to study the effect of sodium tripolyphosphate (TPP), sodium citrate (CT), and glutaraldehyde (GLU) for the physical properties, barrier properties, mechanical properties, and release kinetics of chitosan film incorporated with α-tocopherol. The release of α-tocopherol to the 50% ethanol was also studied and the diffusion coefficient calculated by the Fickian diffusion models. From the results, the crosslinking agent decreased the film lightness and light barrier properties; in addition, it increases the greenness and yellowness of the film. The elongation at break (EB) and tensile strength (TS) tended to decrease when the film was crosslinked. This result can indicate that the crosslinking agent caused the chitosan networks to be linked and then affected the flexibility of the films. The crosslinking agent can increase the hydrophobicity and surface roughness of the film as shown in the increase of the contact angle values and SEM micrographs; instead, there was no significant difference in water vapor permeability values (WVP). The diffusion coefficient of α-tocopherol significantly decreased from when the film was crosslinked, and the slowest release occurred in glutaraldehyde (GLU) due to its ability to generate more crosslinking density that directly affects the mobility of α-tocopherol in the chitosan structure.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Yuyu Li,Fang Luo,Yuhua Xie,Chaofeng Chang,Ming Xie,Zehui Yang
Urea oxidation reaction (UOR) is a promising substitution of oxygen evolution reaction (OER) in overall water splitting technology because of the lower theoretical potential; thereby, a win-win benefit is achieved due to the simultaneous hydrogen generation and water purification . The efficient UOR catalysis substantially depends on the exposed active sites and mass transfer resistance, especially at high current density to meet the requirement of industrial water splitting technology. In this work, we have synthesized α-Ni(OH) 2 porous nanoflowers (α-Ni(OH) 2 –PNF) using ZIF-67 as template. Ascribing to the Kirkendall effect , nanopores are created on α-Ni(OH) 2 nanosheets benefiting for the formation of abundant oxygen vacancies as well as drop-off in mass transfer resistance during UOR catalysis. Meanwhile, the binding strength between active site and CO 2 , rate-determining step of UOR, is weakened by oxygen vacancies; as a result, only 1.477 V vs. RHE is demanded for α-Ni(OH) 2 –PNF to catalyze UOR with 100 mA cm −2 , 67 mV lower than α-Ni(OH) 2 nanosheets. Besides, an exceptional stability is also achieved for α-Ni(OH) 2 –PNF with negligible degradation during 20 h catalysis.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yuan Zhao,Qingshuang Wang,Dongming Yin,Shouliang Li,Chunli Wang,Long Liang,Shaolei Zhao,Chunmin Zhang,Limin Wang,Yong Cheng
The high dehydrogenation temperature of α-AlH 3 has always been an important factor hindering its development. In order to solve this problem, we synthesize Bi-MOF by hydrothermal method and burn it under inert gas to obtain Bi@C, which is used as catalyst ( x Bi@C, x = 3, 5 and 7 wt%) to improve the hydrogen desorption performance of α-AlH 3 . The dehydrogenation onset temperature of α-AlH 3 +5 wt% Bi@C drop to 80.4 °C, which is reduced by 43.4% compared with pure α-AlH 3 . At 120 °C, it can provide a stable hydrogen capacity of 7.45 wt%. In contrast, pure α-AlH 3 releases only 6.66 wt% hydrogen at the same time. The density functional theory calculations further indicate that the existence of Bi@C catalyst can make the Al–H bond length increase, more conducive to the release of hydrogen. The results show that the synergistic effect of Bi and porous carbon in Bi@C materials can improve the hydrogen desorption kinetics of α-AlH 3 , providing a good prospect for the application of α-AlH 3 in hydrogen storage .
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ACS Applied Electronic Materials
·
2023
·
IF 4.7
Xian Sun,Jiuwu Wang,Chenguang Huang,Yingying Wang,Xiang Cheng,Yue Situ,Hong Huang
Transition metal oxides have attracted extensive research interest for supercapacitors due to efficient ion accessibility of nanostructures. Here, hierarchically hollow α-K0.2MnTi0.07O0.8 nanotubes with high K content are prepared via a self-sacrificial template method. The electrochemical performance of α-K0.2MnTi0.07O0.8 nanotubes is significantly improved when beneficial K+ is intercalated into a considerably ordered α-MnO2 phase with exchangeable Mn–K slabs by a K-pre-reserved reaction. Significantly, the α-K0.2MnTi0.07O0.8 nanotubes activated in a K2SO4 electrolyte exhibit highly capable capacitance behavior with high specific capacitance (334.5 F g–1 at 1 A g–1) and superior cycling stability (88% capacitance retention of the initial after 60,000 cycles). The well-designed α-K0.2MnTi0.07O0.8-based supercapacitor device exhibits an energy density of 25.16 Wh kg–1 at 1600 W kg–1. The morphological electrode-structured designer could be a promising attempt for applications in energy-related fields and even beyond power and storage sources.
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JOURNAL OF BIOLOGICAL CHEMISTRY
·
2023
·
IF 4.8
Yanjie Gao,Bingfeng Zheng,Shuaiqi Xu,Zhibo Zhao,Wanyue Liu,Tingyu Wang,Manman Yuan,Xueqing Sun,Yang Tan,Qiang Xu,Xingxin Wu
Sustainable TGF-β1 signaling drives organ fibrogenesis. However, the cellular adaptation to maintain TGF-β1 signaling remains unclear. In this study, we revealed that dietary folate restriction promoted the resolution of liver fibrosis in mice with nonalcoholic steatohepatitis (NASH). In activated hepatic stellate cells (HSCs), folate shifted toward mitochondrial metabolism to sustain TGF-β1 signaling. Mechanistically, nontargeted metabolomics screening identified that α-linolenic acid (ALA) is exhausted by mitochondrial folate metabolism in activated HSCs. Knocking down serine hydroxymethyltransferase 2 (SHMT2) increases the bioconversion of ALA to docosahexaenoic acid (DHA) which inhibits TGF-β1 signaling. Finally, blocking mitochondrial folate metabolism promoted liver fibrosis resolution in NASH mice. In conclusion, mitochondrial folate metabolism/ALA exhaustion/TGF-βR1 reproduction is a feedforward signaling to sustain profibrotic TGF-β1 signaling and targeting mitochondrial folate metabolism is a promising strategy to enforce liver fibrosis resolution.
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