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.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
·
IF 4.4
Feng Zhu,Kang Wang,Tongmou Geng
A first hexaphenylsilole-based conjugated microporous polymer, termed THPS, was prepared by a Friedel-Crafts arylation reaction of 1,1,2,3,4,5-hexabenylthirole with 2,4,6-trichloro-1,3,5-triazine catalyzed by anhydrous aluminium trichloride (AlCl 3 ) in 1,2-dichloroethane. Its Brunauer–Emmett–Teller and Langmuir surface area reached up to 1579 and 2081 m 2 g −1 , and total pore volume and micropore pore volume were severally 0.8325 and 0.7322 cm 3 g −1 . THPS could fluorescence-sense o- nitrophenol with high sensitivity and selectivity. Its fluorescence quenching constant (K SV ) and limits of detection (LODs) were severally 8.32 × 10 3 L mol −1 and 3.61 × 10 -10 mol L −1 . The fluorescence quenching of THPS by o- nitrophenol was originated from the combined action of both photo-induced electron transfer mechanism and resonance energy transfer mechanism.
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npj Biofilms and Microbiomes
·
2023
·Vol. 9
·期 1
·1-13
·
IF 9.2
Zhao Tong,Zhang Yue,Nan Linhua,Zhu Qing,Wang Shukai,Xie Yutao,Dong Xinling,Cao Cui,Lin Xiaoliang,Lu Yu,Liu Yuxia,Huang Linjuan,Gong Guiping,Wang Zhongfu
Understanding how dietary polysaccharides affect mucin O -glycosylation and gut microbiota could provide various nutrition-based treatments. Here, the O -glycan profile of the colonic mucosa and gut microbiome were investigated in C57BL/6J mice fed six structurally diverse dietary polysaccharides and a mixture of six fibers. Dietary polysaccharides increased total O -glycans, mainly by stimulating neutral glycans. Highly branched arabinogalactan promoted terminally fucosylated core 1 O -glycans; whereas linear polysaccharides, including pectin, konjac glucomannan, inulin, and the fiber mixture, favored terminally di-fucosylated O -glycans. The last three polysaccharides also lowered the level of sulfated O -glycans and sialylated mono-fucosylated O -glycans. Varied monosaccharide composition in mixed polysaccharides had a synergistic beneficial effect, boosting fucosylated neutral glycans, decreasing acidic glycans, and stimulating microbial richness and diversity. Dietary polysaccharides containing arabinose and sulfate groups enhanced the relative abundances of Akkermansia and Muribaculaceae , respectively. The present comparison reveals the relationship between dietary polysaccharide structure, mucin O -glycan composition, and intestinal microorganisms.
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JOURNAL OF SURFACTANTS AND DETERGENTS
·
2023
·Vol. 26
·期 6
·771-778
·
IF 1.6
Peng Wei,Faming Wu,Qinghua Zhang,Zhirong Liu
Oil-in-dispersion (O/D) emulsions are the focus in many fields due to their new microstructures and new functions. Herein, O/D emulsions were successfully prepared using series of cationic gemini surfactants 12-s-12 (s = 2, 3, and 6) and alumina nanoparticles. The microstructures and type of emulsions were identified using optical microscopy, zeta potential and contact angle methods. Gemini surfactants with two head groups carry more charges than that of conventional surfactants when adsorbed at the oil–water interface. The O/D emulsions can be stabilized at lower surfactant concentrations compared with the conventional single-headed surfactants. In the presence of 0.1 wt% alumina nanoparticles, gemini surfactants 12-s-12 (s = 2, 3, and 6) can stabilize emulsions at the concentration of 3 × 10 −4 mM (1.84 × 10 −5 wt%), 6 × 10 −4 mM (3.76 × 10 −5 wt%) and 1 × 10 −3 mM (6.68 × 10 −5 wt%), respectively. Addition of excessive organic salts such as sodium salicylate and sodium p-methylbenzenesulfonate shielded the head group charges of gemini surfactants, leading to gemini surfactants to behave as nonionic surfactants Adsorption of surfactants at the alumina nanoparticles occurred, resulting in the transformation from the O/D emulsions to Pickering emulsions. This work shows the advantages of preparing O/D emulsions using gemini surfactants and also provides a new methods of emulsion type transformations by adding excessive oppositely charged organic salts.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Chaogang Zhou,Chaojin Zhou,Jiawei Zhang
The poly(o-phenylenediamine)-ZnO (PoPD-ZnO) composite were synthesized by in-situ polymerization, and the waterborne polyurethane was used as the binder. The corrosion inhibition performance of the PoPD-ZnO composite coating on stainless steel was investigated. The structures of homopolymer PoPD and PoPD-ZnO composite were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Cyclic voltammetry demonstrates the redox properties and stability of the composite. After soaking in 3.5% NaCl for a certain period of time, the corrosion resistance of the polymer coating was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results show that the homopolymer PoPD coating and the PoPD-ZnO composite coating can protect the stainless steel. The corrosion rate of the PoPD-ZnO composite coating with good corrosion resistance is 1.9% of bare steel. In addition, the addition of nano-ZnO facilitates the formation of a compact and low-defect coating, thereby impeding the erosion of corrosive media and improving the corrosion resistance of PoPD coatings.
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FOOD HYDROCOLLOIDS
·
2023
·
IF 10.7
Bo-wen Yang,Sheng-yang Ji,Tian Zhao,Zhang-tie Wang,Yan-song Zhang,Qian-nan Pan,Wei-su Huang,Bai-yi Lu
Although phytosterols (PS) showed various excellent health functions, their applications in the food industry were limited by poor water solubility and high oxidation sensitivity. This study investigated the fabrication of phytosterol-enriched emulsions stabilized by different emulsifiers and evaluated the effect of different interfacial layers on the photooxidation of phytosterols and emulsions. The emulsions were prepared with Tween 20, whey protein isolate (WPI), and soy protein isolate (SPI) to achieve interfacial membranes with different properties. The SPI-dextran mixture or dextran-glycated SPI was adopted as the additional emulsifier. Compared with Tween 20, high molecular weight emulsifiers (proteins and their mixtures) exhibited stronger photooxidation stabilities and high viscosity and density of droplet interfacial membrane. The stability of PS emulsions that undergo photooxidation was impacted by the inclusion of these emulsifiers, whereas the extent of phytosterols photooxidation was, from highest to lowest, in the following order: SPI/dextran mixture > glycated SPI mixture > WPI > SPI > Tween 20. The proper SPI concentration (1.5 wt%) showed the highest interface pressure and viscosity and the higher PS stability. Moreover, the higher rheological properties and surface pressure of droplets reveal extra oxidative stability and lower oxidation rate of PS, as well as the formation of additional 7β-OH products. This work demonstrates that emulsions may be tuned toward better photooxidation oxidative stability by modifying interface composition and interfacial properties.
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LASERS IN MEDICAL SCIENCE
·
2019
·Vol. 34
·期 8
·1535-1545
·
IF 2.076
Zheng Yixin,Yu Endian,Weng Qi,Zhou Leilei,Li Qingyong
Antibiotics and photodynamic therapy (PDT) are widely employed in curing acne. However, antibiotics as an effective treatment would lead to bacterial resistance and severe side effects. In this study, we aimed to develop a novel TBO hydrogel, which could prolong the retention time of photosensitizer (TBO) at the lesion site and improve therapeutic effect. In vitro antibacterial experiments (against Staphylococcus aureus and Escherichia coli ), the response surface methodology was used to optimize the formulation of TBO hydrogel. The results indicated that the optimal formulation was 0.5% ( v / v ) carbomer, 0.01 mg/mL TBO, 0.5% ( v / v ) ethanol concentration, 0.5% ( v / v ) Tween 80, the mass ratio of NaOH to carbomer of 0.4 ( w / w ). The TBO hydrogel formulation showed the strong antibacterial activity for Propionibacterium acnes . The stability, pH, and antibacterial activity of TBO hydrogel did not significantly change under 4 °C, 25 °C, and 40 °C during 6-week storage. Furthermore, TBO combined with carbomer hydrogel showed the 51.28% (4 h) and 69.80% (24 h) release. In summary, the hydrogel TBO might be a vital therapeutic strategy to promote the PDT applied in the topical therapy of acne.
A TBO hydrogel for photodynamic therapy in the treatment of acne
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IUBMB LIFE
·
2018
·Vol. 71
·期 3
·330-339
·
IF 3.236
Qing Wang,Maikun Teng,Xu Li
Catechol- O -methyltransferase (COMT 1 ) catalyzes the transfer of a methyl group from S-adenosylmethionine (SAM) to various catechol substrates. COMTs play vital roles in physiological processes in animals, plants, and fungi, as well as bacteria, and have essential application values in industry. sp COMT is a probable COMT from Schizosaccharomyces pombe . It has an extraordinary intracellular distribution different from other homologs and would thus be predicted to perform a distinct physiological function. In this report, recombinant sp COMT was purified and kinetically characterized for the first time. The enzymology assays indicate that sp COMT is a metal-dependent enzyme and belongs to class I OMTs. In addition, the crystal structures of apo- sp COMT and SAM-complexed sp COMT were also presented, revealing that sp COMT possesses a conserved SAM-binding site and Mg 2+ pocket, but a distinct substrate pocket was not present in homologs. The mutagenesis ITC analysis revealed the SAM recognition characteristics of sp COMT. Based on all of the above findings, we speculated about the putative substrates’ characteristics and the substrate recognition mechanisms of sp COMT. This work will help in elucidating the physiological functions of sp COMT in S. pombe . © 2018 IUBMB Life, 71(3):330–339, 2019
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Chinese Herbal Medicines
·
2018
·
IF 0
Ding Liu,Yan-peng Li,Hong-xiu Shen,Yang Li,Jun He,Qi-zhi Zhang,Yun-mei Liu
Objective To design and synthesize a series of chrysin derivatives and evaluate the antitumor activities with MTT assay , so as to investigate molecular structure-activity relationship with molecular docking . Methods Target products were synthesized with high yield by substitution reaction, hydrolysis reaction, esterification reaction, and saponification reaction in sequence, and activities of all compounds were evaluated with human gastric carcinoma cell lines MGC-803 and human breast carcinoma cell lines MCF-7 through standard MTT assay. Molecular docking results were calculated with Surflex Geom X programme of Sybyl X-2.0 version workstation. Results 7- O -amino acids chrysin derivatives 6a – 6l were synthesized and their inhibitory effects were evaluated by comparing the material chrysin with positive control drug 5-fluorouracil (5-FU). Among these derivatives, compound 5b (IC 50 = 24.50 ± 2.26 µmol/L), 5k (IC 50 = 24.30 ± 2.19 µmol/L), and 6f (IC 50 = 24.61 ± 2.01 µmol/L) showed better inhibitory activities against MGC-803 cell lines, and compound 5g (IC 50 = 13.15 ± 1.73 µmol/L) and 5j (IC 50 = 12.34 ± 1.25 µmol/L) showed better inhibitory activities against MCF-7 cell lines than chrysin and 5-FU. Molecular docking scores showed a credible consistency compared with MTT results. Conclusion Compounds 5b, 5d, 5g, 5j, 5k , and 6f showed good antiproliferative effects on specific tumor cells, and compound 5g should be researched further when according to molecular docking.
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ORGANIC PROCESS RESEARCH & DEVELOPMENT
·
2018
·
IF 3.584
Jie Zhang,Lei Wang,Chuang Li,Shaohua Jin,Changhai Liang
Direct selective hydrogenolysis of dibenzofuran (DBF) derived from coal and shale oil to a value-added chemical, ortho-phenylphenol (OPP), with high selectivity (80%) and yield (48%) has been achieved over Pt/MgO at 400 °C and 1.0 MPa by controlling the C–O bond cleavage as well as minimizing the extent of hydrogenation of aromatic rings. Meanwhile, Pt/SiO2, Pt/Al2O3, and Pt/MgO/Al2O3 catalysts were used for the DBF hydrogenolysis and showed lower selectivity for OPP. The influence of reaction parameters has been studied to unveil the optimal reaction conditions. And the phenomenon of OPP dehydrogenation is found over various catalysts for the hydrogenation reaction of OPP. Extensive reactions and catalyst characterizations demonstrated that the OPP selectivity and the dehydrogenation of OPP to DBF follows the order of supports basicity: MgO-900 > MgO > SiO2 > MgO/Al2O3 > Al2O3, which shows that the acid–base properties of supports impact the adsorption and desorption behaviors of DBF and OPP, and results in the disparity of OPP selectivity and the dehydrogenation of OPP. Finally, a plausible reaction pathway and mechanistic understanding are proposed.
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RSC Advances
·
2019
·Vol. 9
·期 26
·14692-14700
·
IF 3.049
Fangfang Peng,Yangchuan Ke,Shichao Lu,Yi Zhao,Xu Hu,Qingchun Deng
A series of anionic amphiphilic random copolymers with sodium p-styrene sulfonate and dodecyl methacrylate side chains were synthesized via free radical polymerization and their properties in the formation and stabilization of nano-emulsions were investigated. Using poly(sodium p-styrene sulfonate)-ran-poly(dodecyl methacrylate) and Brij 30 as a stabilizer to prepare nanoemulsions, we obtained small droplet size and unimodal distribution nanoemulsions by a low-energy phase inversion composition (PIC) method. The p(SSS)-ran-p(LMA)-Brij 30 co-stabilized nanoemulsions show extraordinary long-term stability and heat resistance, there were almost no variations of droplet size after storing for 35 days and no phase inversion occurred when heating the temperature up to 90 °C. The influence of salinity on the properties of the nanoemulsions was also discussed.
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CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Zhen Zhang,Fujun Jin,Zicong Wu,Ju Jin,Feng Li,Yiliang Wang,Zhiping Wang,Shunqing Tang,Chaoxi Wu,Yifei Wang
Chitosan nanofibers (CSNFs) have potential applications in biomaterials, oil recovery and food packaging, but their instability in moist environment has limited their full utilization. Here we report that CSNFs can be O-acylated in a post-electrospinning treatment by using pyridine as catalyst and short-chain (C2, C3, C4, C5 and C6) and long-chain (C8 and C12) fatty acid anhydrates as acylation agents. The effects of O-acylation to CSNFs were analyzed in detail. FT-IR, 1 H NMR and elemental analysis indicated that the hydroxyl groups of chitosan in CSNFs were acylated in 2 h. XRD spectra indicated that the O-acylation modification altered the crystal structure of the native fibers and the acyl substituents packed in a laterally aligned and layered structure. SEM examinations showed that the acylation modification could effectively control the fibrous structure of CSNFs and improve their stability in moist environment. The O-acylated CSNFs generally have an average diameter about 100 nm except for laurelated CSNFs (∼200 nm). Water contact angle measurement indicated that the wetting properties of O-acylated CSNFs were affected by the length of acyl side chains. This fiber acylation strategy can tune the material properties of CSNFs and expand their potential applications.
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