CARBOHYDRATE RESEARCH
·
2021
·
IF 2.104
Lin Yue,Meihong Zheng,Min Wang,Imran Mahmood Khan,Bin Wang,Xiaoyuan Ma,Chifang Peng,Zhouping Wang,Wenshui Xia
The objectives of the present study are to synthesize a series of chitosan oligosaccharide-O-Terpenol (COS–O-Ter) derivatives and their implication to evaluate in vitro antibacterial activity . Herein, a general strategy is described for preparing COS–O-Ter derivatives, including substitution and deprotection reactions . The structures of COS–O-Ter derivatives were characterized by FT-IR, 1 H NMR, XRD, TGA , and elemental analysis . COS–O-Ter derivatives revealed the excellent solubility and in vitro antibacterial activity. Moreover, their antibacterial activities were more sensitive to Staphylococcus aureus ( S. aureus ) than Escherichia coli ( E. coli ) indicating the effective potential application of COS–O-Ter derivatives as natural antibacterial agents . The aforementioned study opens a pave to expand the application scope of COS and its derivatives in the food and pharmaceutical industries .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2021
·
IF 5.221
Zhu Wen-Yuan,Niu Kun,Liu Peng,Fan Yu-Hang,Liu Zhi-Qiang,Zheng Yu-Guo
L-methionine is an important natural amino acid with broad application prospects. A novel gene encoding the enzyme with the ability to catalyze O-succinyl-L-homoserine (OSH) to L-methionine was screened and characterized. The recombinant O-succinyl-L-homoserine sulfhydrylase from Thioalkalivibrio sulfidiphilus (tsOSHS) exhibited maximum activity at 35°C and pH 6.5. OSHS displayed an excellent thermostability with a half-life of 21.72 h at 30°C. Furthermore, the activity of OSHS increased 115% after Fe2+ added. L-methionine was obtained with a total yield reaching 42.63 g/L under the concentration of O-succinyl-L-homoserine 400 mM (87.6 g/L). These results indicated that OSHS is a potential candidate for applying in the large-scale bioproduction of L-methionine.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Chunyu Zhang,Guozhu Liu,Bo Ning,Shuairen Qian,Danning Zheng,Li Wang
The electrochemical oxygen reduction reaction (ORR) via two-electron pathway is a sustainable way of producing hydrogen peroxide. Nanostructured carbon materials are proved to be effective catalysts for 2e − ORR. Herein, a series of mesoporous carbon with tunable nitrogen species and oxygen functional groups were synthesized by varying the added amount of dopamine hydrochloride as nitrogen and oxygen source. The modified catalysts exhibited higher content of pyrrolic-N and ether C–O groups which are confirmed by a series of characterization. Raman spectra and correlation analysis revealed that the increased proportion of defect sites in carbon materials are closely related to the introduced pyrrolic-N and ether C–O groups. And the rotating ring-disk electrode (RRDE) measurement carried out in 0.1 M KOH electrolyte showed the H 2 O 2 selectivity increased with the content of defect sites. Among them, the optimized catalyst (NOC-6M) exhibited a selectivity of 95.2% and a potential of 0.71 V vs. RHE at −1 mA cm −2 . Moreover, NOC-6M possessed the high H 2 O 2 production rate of 548.8 mmol g cat −1 h −1 with faradaic efficiency of 92.4% in a two-chamber H-cell. Further mechanistic analysis revealed that the introduction of pyrrolic-N and ether C–O are likely to improve the binding energy of the defect sites toward ∗OOH intermediate, resulting in a more favorable 2e − ORR pathway for H 2 O 2 production.
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Yu Lu,Cheng Li,Jie Liu,Wenqi Huang,Yuerong Yang,Yue Jia,Tingting Liu,Linjuan Huang,Zhongfu Wang
Goat milk oligosaccharides represent an unexplored multi-functional ingredient for the dairy industry. Here, we qualitatively and quantitatively compared the N/O -glycome at different lactation stages via online hydrophilic interaction chromatography-tandem mass spectrometry. Complex N -glycans and high mannose N -glycans constituted 82.1% and 17.9% of the glycan pool, respectively. N -glycans with isomers containing non-bisected antenna complex structures accounted for 30.8%. N -glycans modified with Neu5Ac, Neu5Gc and fucosylated were 3.7%, 5.3% and 35.3%. The triantennary trifucosylated complex N -glycan (H5N5F3) was reported for the first time. A comparison between colostrum and mature milk revealed a 1.20-fold decrease in total N -glycans and 1.66-fold decrease in fucosylation with ongoing lactation, echoing the trend in human milk. Similarly, Neu5Ac- and Neu5Gc-modified sialylation decreased by 1.69 and 3.62 times, respectively. In the O -glycome, 46.2% of structures were O -linked core 1, 23.1% were O -linked core 2, 7.7% were O -linked core 3 and core 4. As lactation progressed, overall O -glycans content decreased by 1.26-fold. Unlike human milk, Neu5Ac- and Neu5Gc-modified sialylation increased by 4.4 and 2 times, respectively. These findings will facilitate research on the structure-function relationship of goat milk oligosaccharides and the development of formula food targeting different age groups.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Results in Chemistry
·
2021
·
IF 0
Liu Yang,Hong Zheng,Lian Liu,Wenjie Wu,Shuya Wang
Biomass carbon materials have been widely used as electrode materials for super-capacitors (SC) due to their economic, environmental, and sustainable characteristics. In this work, we proposed that the Sapindus Mukorossi Peel (SMP) was used as a precursor to prepare a Sapindus Mukorossi Peel-based activated carbon material (SMPC) through carbonization and KOH activation. The morphology and structure of SMPC were characterized by various test methods. Cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and electrochemical impedance spectroscopy (EIS) were used to characterize its electrochemical performance. The results show that SMPC has suitable pore size distribution, a large number of heteroatom functional groups and excellent electrical conductivity. In addition, the amount of activator also has an important influence on the performance of SMPC. When the mass ratio of carbon material to KOH is 1:3, the prepared sample SMPC-3 has the largest specific surface area (SSA) was 1254.5 m 2 /g. Moreover, SMPC-3 also has excellent electrochemical properties, high specific capacitance (at 1 A/g, the specific capacitance can reach 314.5F/g), good cycle stability (at 5 A/g, cyclic charge and discharge 5000 times, the specific capacitance is only lost by 4.2%.), superior rate performance (when the current density is increased from 0.5 A/g to 10 A/g, the specific capacitance retention rate is 80.4%). Assembling SMPC-3 // SMPC-3 into a symmetrical SC shows higher energy density (at 0.1 A/g, the energy density is 6.68 Wh/Kg) and power density (at 5 A/g, the power density is 3250 W/Kg).
✓ 已验证
产品关联
DOI
Journal of Flow Chemistry
·
2021
·Vol. 11
·期 2
·171-179
·
IF 2.786
Lan Zhou,Lu Yangcheng
The matching of the micro-dispersion method and the reaction kinetics is of the utmost importance for the fast and strongly exothermic nitration reaction. Taken as an example to discuss this issue, a synthesis of 3,4-dichloronitrobenzene via the nitration of o -dichlorobenzene with mixed acid of nitric acid and sulfuric acid was conducted in continuous-flow reactors in this work. Through combining the adiabatic reaction environment, the use of a micropacked-bed reactor, and introducing partial product circulation, it successfully achieved the matching of the micro-dispersion state and the reaction kinetic characteristics. The good two-phase dispersion state can be maintained throughout the micropacked-bed reactor and the reaction can be completed within 5 s with above 89% selectivity under adiabatic condition. Furthermore, the reaction activation energy was conveniently obtained by processing the temperature distribution data, providing a fundamental to realize a reliable design of the nitration reaction process with high efficiency and inherent safety. Graphical abstract
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 27
·9337-9344
·
IF 7.059
Aili Wang,Lili Zhao,Hui Liu,Ziqian Zhou,Chengbo Li,Yong Xiang,Weijia Zhou,Feng Hao
The development of low-dimensional non-precious metal catalysts for the hydrogen evolution reaction (HER) is highly desired for clean energy utilization. Herein, we have reported a facile synthesis protocol of Cu–Mo–O (CMO) nanowires and nanosheets on Cu foam (CMOW/CF and CMOS/CF) through a one-step reaction of Cu nanowires with (NH4)6Mo7O24 solution directly under mild conditions. The final product morphology has been tuned by mechanical stirring. The as-synthesized CMOS/CF exhibits a low operating overpotential of 112 mV at a current density of 10 mA cm−2 with a high electrochemical active area of 25.1 mF cm−2 and excellent long-term stability in the 1 M KOH electrolyte. Moreover, by using the CMOS/CF as cathodic and anodic electocatalysts, a two-electrode electrolyzer capable of driving 10 mA cm−2 at a cell voltage of 1.69 V was achieved, along with promising stability. The high performance of the CMOS/CF can be attributed to higher electrochemical area and more Mo catalytic sites induced by mechanical stirring. This work provides a facile method for the synthesis and catalytic site regulation through a simple method of low-dimensional nanomaterials for the HER with relatively high electrochemical active area and catalytic activity.
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 9
·2109
·
IF 3.267
Changzhou Chen,Peng Liu,Haihong Xia,Minghao Zhou,Jiaping Zhao,Brajendra K. Sharma,Jianchun Jiang
It is of great importance to explore the selective hydrogenolysis of β-O-4 linkages, which account for 45–60% of all linkages in native lignin, to produce valued-added chemicals and fuels from biomass employing UV light as catalyst. TiO2exhibited satisfactory catalytic performances in various photochemical reactions, due to its versatile advantages involving high catalytic activity, low cost and non-toxicity. In this work, 20 wt.% Ni/TiO2and oxidant PCC (Pyridinium chlorochromate) were employed to promote the cleavage of β-O-4 alcohol to obtain high value chemicals under UV irradiation at room temperature. The Ni/TiO2photocatalyst can be magnetically recovered and efficiently reused in the following four consecutive recycling tests in the cleavage of β-O-4 ether bond in lignin. Mechanism studies suggested that the oxidation of β-O-4 alcohol to β-O-4 ketone by oxidant PCC first occurred during the reaction, and was followed by the photocatalysis of the obtained β-O-4 ketone to corresponding acetophenone and phenol derivates. Furthermore, the system was tested on a variety of lignin model substrates containing β-O-4 linkage for the generation of fragmentation products in good to excellent results.Keywords:lignin;β-O-4;photocatalyst;Ni/TiO2;oxidant PCC
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Yuting Li,Qiaoling Huang,Xiangying Yu,Yujia Liu,Lin Li,Bing Li,Xia Zhang,Sui Chen,Zhan Liu,Xianglong Zhao,Jingjing Ma
The reaction of N ε -(carboxymethyl) lysine (CML) with eight kinds of non-flavonoid o -benzoquinones and five kinds of flavonoid o -benzoquinones were investigated by cyclic voltammetry at pH 5.0, 7.0 and 8.0 and scan rate of 10, 50 and 100 mV/s. The reactivity of o -benzoquinones towards CML is weakened by the electron-donating substituent and strengthened by the electron-withdrawing substituent on the o -benzoquinone rings. The steric hindrance of the substituents on o -benzoquinone rings also weakens the quinone reactivity. Reaction of 4-methylbenzoquinone with CML (38.0 ± 1.3%) was found to be faster than that with l -lysine (31.3 ± 1.5%) and Nα-acetyl- l -lysine (14.5 ± 0.1%) but slower than that with l -cysteine (≥100.0%) and Nα-acetyl- l -cysteine (≥100.0%) at pH 7.0 and scan rate of 10 mV/s. Products obtained by the reaction of CML with o -benzoquinones were found to include a CML-quinone adduct according to the cyclic voltammetry and UPLC-QTOF-MS/MS analysis.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xiaoyan Li,Rui Zhao,Hongfang Li,Jing Jiang,Lunhong Ai,Xuejuan Cao,Juanli Liu,Hanjun Zou,Youyu Duan
Suffering from inefficient separation and transfer of photogenerated carriers, the deeply photocatalytic oxidation of NO-to-NO 3 – over g-C 3 N 4 is still a daunting challenge. Well-designed heterojunction photocatalysts have been proven to be effective in steering charge transfer for achieving a particular migration path and more active sites, which hold huge promise in further performance stimulation. Herein, in-situ face-to-face hydrothermal approach is developed to prepare a multilayer heterostructure O doping g-C 3 N 4 (O-g-C 3 N 4 ) with W 18 O 49 (O-g-C 3 N 4 @W 18 O 49 ). The experimental and theoretical results show that the unique multilayer heterostructure can improve the separation efficiency of carriers by changing the electron migration path. Moreover, doping O atoms are identified as the newly formed active centers to largely facilitate the activation of NO. Impressively, the O-g-C 3 N 4 @W 18 O 49 photocatalyst thus exhibits largely improved photocatalytic NO removal rate (56.7 %, 0.1 g of sample) and high selectivity of NO to NO 3 – (98.3 %). It outperforms the reported photocatalysts materials in visible light. This study not only provides a facile strategy for experimentally screening advanced photocatalytic materials, but also paves the way for the deep oxidation of NO.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Yongqi Zhang,Hongrui Cheng,Xin Chen,Yuanhui Zheng
Two-dimensional (2D) Sn-based perovskites have emerged as a promising alternative to Pb-based perovskites due to their nontoxic nature. However, Sn2+ ions tend to get oxidized to Sn4+ during the synthesis process, leading to crystalline defects and rapid nonradiative transitions, which limits their applications. In this study, we present a facile molecular doping strategy for (C18H35NH3)2SnBr4 perovskite by introducing o-phenylenediamine (oPD) in the precursor solution. The oPD serves a dual role: it not only acts as an electron donor, creating a reducing environment to suppress the oxidation of Sn2+, but also functions as a chelating agent, forming stable compounds with Sn2+. This approach results in 20% oPD doped (C18H35NH3)2SnBr4 perovskite, which exhibits a high photoluminescence quantum yield (PLQY) of 95.3% and excellent stability against oxygen. Furthermore, UV-pumped orange and white light-emitting diodes (LEDs) with a CIE coordinate (0.562, 0.431, 0.327, and 0.346) were produced using oPD-doped 2D tin-based perovskite powders, respectively. These findings suggest that the doping strategy has great potential to enhance the stability of 2D Sn-based perovskites and facilitate their application in the field of lighting devices.
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2023
·
IF 12.9
Zhao Sun,Shufan Yu,Sam Toan,Rufat Abiev,Maohong Fan,Zhiqiang Sun
Steam reforming of methanol is a promising approach to achieving hydrogen storage, transportation, and in situ supply. However, this technology is restricted by its high CO selectivity and catalyst deactivation. In this study, CuCr2O4-based catalytic oxygen carriers are tailored for lattice oxygen participating in low-temperature methanol reforming. We found that the low-temperature activation of methanol originated from Cu–O–Cr structure intensification and highly activated lattice oxygen induction. Specifically, methanol can be activated at temperatures as low as 160 °C, on the one hand, attributed to the reinforcement of the Cu–O–Cr structure and, on the other hand, owing to the highly reactive lattice oxygen from the CuO4 tetrahedron in the CuCr2O4 spinel. Combined with XAS and Raman results, the formation of the Cu–O–Cr structure is demonstrated. The hydrogen production rate with an applied CuCr2O4-based catalytic oxygen carrier is 53.2% higher than the control group without Cu–O–Cr formulation. Satisfactory cyclic stability is retained after the 50th lattice oxygen induction and supplement cycle, ascribing to the Cu–O–Cr structure that strongly intensifies Cu–Cr2O3 interactions. DFT results reveal that the process of CH3OH → CH3O* is the rate-determining step. Compared to Cu(111) and Cr2O3(110), the tailored Cu(111)/Cr2O3(110) surface with a Cu–O–Cr structure exhibits the lowest potential barrier during this process, promoting low-temperature methanol reforming.
✓ 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）