FOOD HYDROCOLLOIDS
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2021
·
IF 9.147
Xiuying Han,Huiliang Wen,Yu Luo,Jun Yang,Wenhao Xiao,Xiaoyao Ji,Jianhua Xie
To overcome the limited surface area of starch and improve the adsorption capacity of starch, porous starch has been widely produced in various fields. In this study, the different enzyme activities of α-amylase (AM), glucoamylase (GAM), and mixed enzyme (ME) were used to prepare different types of porous maize starch, and the microstructure, particle morphology, adsorption, and gelatinization characteristics of the porous starch were studied. Scanning electron microscopy showed porous structures with diverse pore size distribution and pore area depending on the enzyme type and its activities; AM produced the largest holes, GAM produced the deepest holes, and ME produced large and deep holes. Adsorptive capacity was significantly affected by enzymatic modification being greater influenced by GAM. The porous starches had higher relative crystallinity as deduced from X-ray diffraction and Fourier transform infrared spectroscopy . The MA-treated starch had higher solubility whereas swelling capacity, peak viscosity, final viscosity, breakdown, and setback of both treatments were decreased compared to the native starch. The results indicate porous maize starch can provide different functions according to the action pattern of enzymes. The type of enzyme and its enzyme activity can be used to produce the ideal cavity and pore size starch granules , which expands its application scope.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Chengfu Deng,Zhibing He,Jinglin Huang,Lei Liu,Yansong Liu,Tao Wang,Guo Chen,Yong Yi,Kai Du
Aqueous asymmetric sodium-ion supercapacitors (ASSCs) with high energy density assembled from all-inorganic materials are expected to provide high-efficiency power sources for intelligent electric vehicles and off-grid systems. However, it is still challenging to fabricate high-performance positive materials by a simple method and rationally assemble ASSCs to meet the demand of ultralong cycle life and high energy/power density. Here, a simple pre-activation strategy was introduced into the α-MnO 2 electrode with a microcrystalline nanosheet structure to improve the Na-storage performance. The sodium-ions concentration was optimized by tuning charge-discharge parameters. Impressively, the pre-activated electrode achieved superior capacitance retention after 10,000 cycles, high volumetric capacitance of 377 F cm −3 and low charge transfer resistance of 5.9 Ω. Based on the facile operability of the proposed pre-activation strategy, it can be expected to be easily ported to other Li/K/Zn-storage, providing a novel avenue for the exploration of positive electrode materials with outstanding electrochemical behaviors. A novel ASSC was fabricated by matching α-MnO 2 //WO 3 electrodes, exhibiting wide voltage of 2.0 V, high energy/power density (0.965 W h cm −3 /65.2 W cm −3 ) and ultralong cycle life. This work proposes a simple strategy to develop high-performance positive materials and assemble ASSC with high energy/power density and long-term stable operation.
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高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 37
·15495-15501
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IF 0
Guangdi Nie,Xiaofeng Lu,Junyu Lei,Ziqiao Jiang,Ce Wang
V2O5-doped α-Fe2O3 composite nanotubes have been successfully fabricated via a simple one-step electrospinning technique followed by calcination treatment. For the first time, we found that the magnetic properties of the as-prepared samples were significantly dependent on the contents of the dopant. In comparison with pristine α-Fe2O3, perfect reversibility, more excellent capacitance and better cycling stability were simultaneously observed for the hybrid metal oxide with an appropriate mass ratio of V2O5 (VFNT1) when it was utilized for supercapacitor electrodes, indicating that the doped α-Fe2O3 tubular nanostructures are fairly promising for practical applications not only in magnetic recording but also in the energy storage field.
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JOURNAL OF PHYSICAL CHEMISTRY B
·
2014
·
IF 3.377
Long Huang,Lili Zhang,Xinan Huang,Tao Li,Bo Liu,Dan Lu
In this work, the α-conformation (individual locally separated chain) of the conjugated polymer poly(9,9-dioctylfluorene) (PFO) in dilute solution is studied by the following three points: the Mark–Houwink exponent a, the fractal dimension D, and the form factor Rg/Rh. From the result of a, the α-conformation of PFO is considered to have a semirigid chain conformation in dilute solution. We establish the mathematical relationship between the Mark–Houwink exponent a and the fractal dimension D in dilute solution. To prove the rationality of this mathematical relationship, the classic polymer polystyrene (PS) is used for comparison. According to the result of D, it can be known that the α-conformation of PFO has a relatively loose and extended chain conformation. Moreover, we use light scattering to get the form factor Rg/Rh of the PFO solution in which the α-conformation and β-conformation coexist. It is found that Rg/Rh increases with the proportion of α-conformation, which indicates that the α-conformation of PFO has a loose and extended chain conformation, and this result agrees well with the conclusions drawn from a and D. On the basis of the fact that the β-conformation (ordered conformation) and α-conformation of PFO can transform into each other in solution, this work is significant for the control of the β-conformation and will have a potential meaning to increase the charge carrier mobility and efficiency from the PFO solution to films.
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2019
·
IF 2.683
Weikang Liu,Bin Cheng,Tingting Miao,Jihao Xie,Liang Liu,Jinru Si,Guangjun Zhou,Hongwei Qin,Jifan Hu
The raw nano α-Fe 2 O 3 powders consisting of nanorods with 50–100 nm in length and 8–14 nm in width exhibit superparamagnetism. The vacuum annealing of the raw nano α-Fe 2 O 3 at 400 °C for 3 h leads to ferromagnetic-like behaviors at room temperature (RT), due to the appearance of ferrimagnetic Fe 3 O 4 . The α-Fe 2 O 3 /Fe 3 O 4 composite structure has an antiferromagnetic α-Fe 2 O 3 layer and a ferrimagnetic Fe 3 O 4 layer contains a certain amount of Fe 2+ and oxygen vacancies. In addition, nano α-Fe 2 O 3 annealed in H 2 at 300 °C for 3 h completely become Fe 3 O 4 . Some magnetic properties of the α-Fe 2 O 3 /Fe 3 O 4 , such as magnetization, magnetic remanence (Mr), coercivity (Hc) and exchange bias (EB), can be modulated almost reversibly and non-volatilely by applied external RT electric field without loop current. However, for both the raw nano α-Fe 2 O 3 and the Fe 3 O 4 , these magnetic properties cannot be modulated by applied external RT electric field. The electric field control of magnetic properties for the α-Fe 2 O 3 /Fe 3 O 4 should be due to the mechanism of phase transition induced by migration and redistribution of oxygen vacancies within the interface of α-Fe 2 O 3 /Fe 3 O 4 .
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Fangchao Wang,Rui Liu,Hongyi Cui,Ali Ramazani,Ali Morsali,Guoying Zhang
The epoxidation of long-chain α-olefins presents a significant challenge in synthetic chemistry, particularly when employing molecular oxygen from air as the sole oxidant under additive-free conditions. In this study, we demonstrate that manganese supported on mesoporous silica (Mn/MSN) effectively catalyzes the aerobic epoxidation of long-chain α-olefins without requiring initiators or sacrificial agents. Mechanistic investigations reveal a synergistic interplay between Mn(II) and Mn(III) species, which facilitates the selective cleavage the peroxo bonds (O–O) in alkyl hydroperoxide intermediates. Strategic incorporation of iron and zirconium into the Mn/MSN framework modulates the manganese oxidation states, enriching the Mn(II)/Mn(III) ratio and achieving a remarkable space-time yield of up to 200 mol epoxide mol⁻¹ Mn h⁻¹ . Radical trapping experiments combined with high-resolution mass spectrometry corroborate the formation of allyl carbon-centered and alkoxy radical intermediates during the reaction. This work provides a feasible strategy for long-chain α-olefin aerobic epoxidation without any additives.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lin Ma,Xiaotong Chen,Hua Kang,Zijiang Liu,Guixin Wan,Shuyi Ma,Tingting Wang,Liang Cheng,Nina Ma,Ping Ni
Recently, materials derived from metal-organic frameworks (MOFs) have garnered increasing attention owing to their exceptional gas-sensing performance. In this study, hollow ship-like α-Fe 2 O 3 with oxygen vacancy defects and thin shells were successfully synthesized via a simple calcination method using MIL-88A (Fe) as a precursor. Characterization results revealed that the α-Fe 2 O 3 exhibited a porous structure composed of nanoparticles featuring a rough surface. Notably, under the optimum operating temperature of 180 °C, the sensor based on α-Fe 2 O 3 demonstrated remarkable performance in detecting triethylamine gas (TEA), exhibiting an ultra-high response (527 at 50 ppm), rapid response/recovery times (20/8 s at 2 ppm), and excellent selectivity. These outstanding TEA-sensing properties are primarily attributed to the unique morphologic structures and suitable defects, suggesting that this research will facilitate the efficient and rapid development of high-performance gas sensors for TEA.
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高影响因子
Food Bioscience
·
2025
·
IF 5.9
Jingyang Liu,Jihang Hou,Zhiyi Zhang,Yongkang Liu,Rong Liu,Zeyuan Deng,Ting Luo
Ulcerative colitis (UC) is a chronic, recurring gastrointestinal disease that not only threatens human health but also increases the risk of colon cancer. Camellia oil has potential for the treatment of colitis. However, bioactive compounds, namely squalene and α-tocopherol, vary greatly in Camellia oil from different regions, and their therapeutic efficacy in colitis varies. We therefore investigated the effect of Camellia oil with different concentrations of squalene and α-tocopherol on colitis. Our results showed that Camellia oil attenuated the weight loss, decreased disease activity index (DAI), increased colon length, improved colon histology in DSS-induced colitis in mice, and reduced the gene expression and serum concentrations of TNF-α and IL-6. Camellia oil supplemented with squalene (final concentration of 375 mg/kg of Camellia oil) and α-tocopherol (final concentration of 600 mg/kg of Camellia oil) had the most potent effects on the alleviation of colitis symptoms. In conclusion, the intake of Camellia oil relieved DSS-induced colitis, and the modulation of squalene and α-tocopherol contents in Camellia oil further impacted its efficacy, which provides a theoretical basis for the development of novel Camellia oil with potent therapeutic potential to lower the risk of colitis.
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高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Tao Chen,Changdong Lin,Weihang Lu,Shuo Wang,Cheng Shen,Juyuan Luo,Yulin Li
In the present study, six 7- O -glycosyl acylation of flavonoids derived from lutonarin and saponarin were obtained from barley seedlings by medium-pressure LC, high-speed counter-current chromatography and preparative HPLC guided by UPLC-QTOF-MS/MS. Their inhibitory effects on α-glucosidase were investigated. Structure–activity relationship showed 7- O -glycosyl acylation enhanced inhibitory effect on α-glucosidase with coumaroyl > feruloyl > hydroxybenzoyl > sinapoyl. The IC₅₀ values for saponarin and its four acylated products were 802.4 ± 0.48 μg/mL, 374.6 ± 0.16 μg/mL, 461.6 ± 0.27 μg/mL, 523.8 ± 0.24 μg/mL and 585.8 ± 0.42 μg/mL, respectively. Steady-state fluorescence spectroscopy revealed 7- O -glycosyl acylation enhanced the fluorescence quenching rate of α-glucosidase. Molecular docking revealed 7- O -glycosyl acylation formed more hydrogen bonds and hydrophobic interactions with α-glucosidase. Synchronous fluorescence spectroscopy showed all compounds altered the hydrophobic microenvironment surrounding the tryptophan residues in α-glucosidase. Circular dichroism spectroscopy indicated 7- O -glycosyl acylation modified the conformation and secondary structure of α-glucosidase.
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DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Kang Liu,Shuang Luo,Jianying Liang,Pengfei Xu,Jinglv Feng,Shumin Qin,Jien Li
Graphical A hydrothermal process is used for co-doping Mo and Zn into tunnel-structured MnO 2 (MZMO), enhancing its ion diffusion kinetics and electrical conductivity by introducing impurity energy levels and generating oxygen vacancies. This co-doping strategy also stabilizes the MnO 2 framework, enabling the MZMO cathode to achieve exceptional capacity, highly reversible H + /Zn 2+ co-intercalation, and prolonged cycle life. To address the rising demand for eco-friendly and efficient energy storage devices, rechargeable aqueous zinc ion batteries (AZIBs) are emerging as a promising candidate for large-scale energy storage. α-MnO 2 has attracted extensive attention for its open channels and exceptional Zn 2+ storage capacity. However, the electrochemical performance of α-MnO 2 is significantly hindered by severe structural collapse and sluggish reaction kinetics. Herein, we propose a simple hydrothermal approach for co-doping Mo and Zn into tunnel-structured MnO 2 (MZMO). The ion diffusion kinetics of MZMO are optimized due to ameliorated electrical conductivity by doped cations and introduced oxygen vacancies within the MnO 2 lattice. Moreover, Mo and Zn co-doping stabilizes the MnO 2 framework, significantly enhancing its electrochemical performance during prolonged cycling. Charge storage mechanism analysis further validates the extraordinary stability of the MZMO phase structure during the Zn 2+ /H + co-intercalation and deintercalation. The MZMO cathode demonstrates rapid and reversible Zn 2+ storage, with a high capacity of 395 mAh g −1 at 0.2 A g −1 , and the capacity remains at 136 mAh g −1 after 1000 cycles at 2 A g −1 . This study demonstrates Mo and Zn co-doping is an effective strategy to enhance the electrochemical performance of MnO 2 , offering valuable insights for developing other promising cathodes for AZIBs.
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DOI
PubMed
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 8
·5801-5807
·
IF 4.6
Zeen Zhang,Tianjiao Li,Yong Dong,Yangcheng Lu
This study focuses on ethylene homopolymerization catalyzed by α-diimine catalysts within a designed microfluidic system. Distinct from conventional batch reactors, this microfluidic configuration effectively eradicates the reaction environment heterogeneity, thereby guaranteeing homogeneous reaction conditions and decoupling the mass transfer from the reaction process. This unique setup enables precise modulation of ethylene concentration, facilitating the isolation of variables to scrutinize the effects of temperature and pressure on the polymerization. By varying residence times, it's revealed that the reaction rate is ethylene concentration-independent. Variable separation studies between concentration and temperature show an inverse relationship between temperature and branching degree (BD), contrasting traditional batch reactions due to ethylene concentration changes. Pressure studies indicate that higher pressure leads to lower BD. Different product structures' steric hindrances influence the reaction rate; greater hindrance slows it down. These novel findings suggest microreactors offer new perspectives on late transition metal-catalyzed ethylene homopolymerization, potentially enabling breakthroughs in mass production.
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PubMed
高影响因子
MARINE BIOTECHNOLOGY
·
2025
·Vol. 27
·期 3
·1-9
·
IF 2.8
Li Jinling,Zhou Zhiyan,Feng Fangjian,Yuan Wei,Zhang Yawen,Wang Jiaxing,Zhang Bin,Jin Haixiao,He Shan,Ding Lijian
Epilepsy is a serious brain disease that urgently needs new drugs to treat it. In this study, three new α -pyrone derivatives, nocardipones A − C ( 1 − 3 ), were isolated from the sponge-associated actinomycete Nocardiopsis sp. NBUDK19 guided by anti-epileptic bioactivity using an in vivo zebrafish model. Compounds 1 − 3 were isolated and purified by silica gel column chromatography combined with semi-preparative HPLC. The structures of 1 − 3 were elucidated by UV, HRESIMS, NMR spectroscopic analysis, optical rotation, and computational chemical calculations. Our pharmacological study showed that compounds 1 − 3 exhibited notable reductions in seizure-like locomotor activity at 5 μg/mL. The qPCR analysis showed that compounds 1 − 3 significantly regulated the mRNA expression levels of c-fos and genes associated with GABAergic-glutamatergic signaling, including gria1b and gat1 . The molecular docking revealed that compounds 1 − 3 strongly binding to 4-aminobutyric acid transaminase, with binding energies of − 7.3, − 7.8, and − 7.3 kcal/mol, respectively. This work enriches bioactive drug discovery to treat epilepsy and illustrates an underlying pharmacological and molecular mechanism of these natural α -pyrones.
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PubMed
高影响因子
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