JOURNAL OF INTERFERON AND CYTOKINE RESEARCH
·
2019
·Vol. 39
·期 9
·554-563
·
IF 1.774
Yan Yan,Pengchong Wang,Ying Sun,Yalin Dong,Jianfeng Xing
Previously, we reported that 3, 4-oxo-isopropylidene-shikimic acid (ISA) has therapeutic potential in experimental colitis in rats. This study aimed to elucidate the potential mechanisms of ISA on the inflammatory response in rats with 2, 4, 6-trinitrobenzenesulfonic acid-induced colitis. After the induction of colitis, rats were orally administered ISA for 12 days. Then, the expression levels of inflammatory cytokines, cell adhesion molecules, and matrix metalloproteinase (MMP) in the blood and colon tissues, and the protein level of nuclear factor kappa B (NF-κB) p65 in cytoplasm and nucleus of colon tissues were evaluated. As a result, an enhanced inflammatory response was observed in rats with experimental colitis. However, the treatment with ISA significantly ameliorated the inflammatory response, which was manifested as a significant decrease in the levels of tumor necrosis factor (TNF)-α, interleukin (IL)-1β, interferon (IFN)-γ, IL-8, TNF-α mRNA, P-selectin, E-selectin, intercellular cell adhesion molecule-1, MMP9 and MMP9 mRNA in rat blood and colon tissues, respectively, and a significant decrease in the levels of IFN-γ/IL-4, and the NF-κBp65 activity coefficient. Therefore, the therapeutic effect of ISA on experimental colitis may be related to its inhibitory effect on the expression of cytokines, adhesion molecules, and MMP9, which may be involved in the inhibition of the activation and nuclear translocation of NF-κBp65.
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PROCESS BIOCHEMISTRY
·
2019
·
IF 2.883
Zhe-Ming Wu,Chang-Ling Hao,Tao Tong,Ren-Chao Zheng,Yu-Guo Zheng
( S )-3-Cyano-5-methylhexanoic acid (( S )-CMHA) is the key chiral intermediate of pregabalin . In this paper, an aqueous two-phase system (ATPS) was developed to extract ( S )-CMHA from nitrilase-catalyzed bioconversion broth. Inorganic salts and hydrophilic solvents were screened to form ATPS, among which an acetone/ammonium sulfate ATPS was investigated in detail, including phase diagram, effect of phase composition and stability of ( S )-CMHA. The maximum product recovery of 99.15% was obtained by an optimized ATPS system composed of 15% (w/w) ammonium sulfate and 35% (w/w) acetone with the removal of 99% cells and 86.27% proteins. The total ( S )-CMHA yield reached 92.11% after back-extraction. The recycling use of ammonium sulfate was investigated, and 93.10% of salt in the salt-rich phase was recovered with the addition of methanol. The results demonstrated the efficiency of the two-step extraction process for separation of ( S )-CMHA.
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CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Zhuo Zhou,Haiming Xu,Dongya Li,Zhongwei Zou,Dongsheng Xia
La(OH) 3 /BiOCl n-n heterojunction (BCL) was successfully fabricated by facile microwave technique. Photocatalytic performance experiments confirmed that BCL-20 can degrade 20 mg/L tetracycline hydrochloride (TC-HCl) about 85% in 60 min, which is 2 and 0.5 times higher than that of BiOCl and La(OH) 3 , respectively. The photocatalytic mechanism reveals that the co-effect of oxygen vacancies (OVs) and rebuilt internal electric field induced by heterostructure not only broaden the light-responsive range but also augment the separation efficiency of photogenerated carriers, thus improving the photocatalytic properties of BCL. This work provides a new avenue for improving the photocatalytic performance of Bi-based photocatalysts by heterojunction and OVs.
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CELLULOSE
·
2019
·Vol. 27
·期 3
·1451-1463
·
IF 3.917
Zhou Lipeng,Gao Dongting,Yang Jingru,Yang Xiaomei,Su Yunlai,Lu Tianliang
Abstract Conversion of cellulose to chemicals is an economic and environmental route for biomass utilization. In this work, efficient conversion of cellulose to alkyl levulinates and levulinic acid was realized by oxidation pretreatment combined with alcoholysis over Al 2 (SO 4 ) 3 catalyst. Proper pre-oxidation conditions including oxidation temperature and time are important. By pre-oxidation, part of hydroxymethyl groups on cellulose was converted to carboxyl groups which provide the Brønsted acid sites near the glycosidic bonds to improve the depolymerization of cellulose to monosaccharide. Al 2 (SO 4 ) 3 ·18H 2 O can play both Brønsted and Lewis acid roles in methanol and catalyze the conversion of monosaccharide to alkyl levulinates and levulinic acid. After pre-oxidation at optimized conditions, cellulose can be converted into methyl levulinate and levulinic acid over Al 2 (SO 4 ) 3 in methanol efficiently, and total yield of methyl levulinate and levulinic acid can reach 66.8% at 180 °C for 3 h. Furthermore, the simple and cheap Al 2 (SO 4 ) 3 catalyst is recyclable which is important for the practical application. Graphic abstract
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2019
·
IF 2.29
Kun Fu,Pan Zhang,Dong Fu
The viscosities ( η ) of CO 2 -loaded 3-(dimethylamino)propan-1-ol (3DMA1P) aqueous solutions, CO 2 -unloaded and CO 2 -loaded 2-(ethylamino)ethanol (EAE)- 3DMA1P aqueous solutions were measured by using the NDJ-5S rotational viscometer . The temperature ranged from 303.2 K to 323.2 K. The mass fractions of 3DMA1P and EAE ranged from 0.3 to 0.5 and 0.01 to 0.03 respectively. The Weiland equation was used to model the viscosity and the calculated results agreed well with the experimental results. The effects of mass fractions of amines ( w ), temperature ( T ) and CO 2 loading ( α ) on viscosity were demonstrated on the basis of experiments and calculations.
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GREEN CHEMISTRY
·
2019
·Vol. 21
·期 7
·1702-1709
·
IF 9.405
Shujing Zhang,Hong Ma,Yuxia Sun,Yang Luo,Xin Liu,Meiyun Zhang,Jin Gao,Jie Xu
The selective hydrogenation and rearrangement of 5-hydroxymethylfurfural (5-HMF) to 3-hydroxymethyl-cyclopentone (HCPN) were studied over a MOF-derived bimetallic nickel–copper catalyst in water. The combination of nickel and copper dramatically improved the efficiency in both the selective hydrogenation of the carbonyl group of 5-HMF and the hydrogenative ring-rearrangement of the C5 ring, affording 70.3% yield for HCPN and 99.8% yield for the rearrangement products. Moreover, it was indicated that water acted as a solvent, reactant, and proton donor by dissociation at an elevated temperature, which supplied slightly acidic conditions and promoted the rearrangement reaction.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Chunli Li,Xuefei Wang,Hao Li,Cong Duan,Le An,Qing Liu
Experimental liquid–liquid equilibrium (LLE) data for the system ethylene glycol (EG) + 1,2-butanediol (1,2-BD) + 3-heptanone were measured at atmospheric pressure at 293.15, 303.15, and 313.15 K and the ternary LLE for systems of EG + 1,2-BD + anisole were also investigated at 303.15 K at 101.3 KPa by using liquid–liquid equilibrium kettle method. Distribution coefficient and selectivity were obtained and applied to evaluate the extraction capacity of 3-heptanone and anisole. The reliability of the experimental data was confirmed by the Hand correlation and the Othmer–Tobias correlation. The experimental LLE data were correlated by NRTL and UNIQUAC models, and the corresponding parameters were obtained. The root-mean-square deviations (RMSD) between the experimental data and calculated values were less than 1.22%. Topological concepts related to the Gibbs stability test were used to validate the consistency between model parameters and experimental data. The liquid–liquid equilibrium data provide the basic physicochemical properties for design of extraction process of 1,2-BD from EG by 3-heptanone and anisole. According to comprehensive correlation coefficient analysis, 3-heptanone is more suitable for the extraction of 1,2-BD from EG than anisole.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Dongxue Luo,Ping Lei,Yunxuan Huang,Guorong Tian,Xingde Xiang
Rechargeable aqueous sodium-ion batteries (SIBs) are urgently pursued as a low-cost candidate for grid-scale storage of intermittent renewable energies. NASICON-type NaTi 2 (PO 4 ) 3 holds great promises as anode material for aqueous SIBs owing to the high theoretical capacity and low redox potential , but being severely challenged by poor cycling performance and low reaction kinetics. Herein, graphene-integrated NaTi 2 (PO 4 ) 3 /C composite is prepared with a facile sol-gel approach as anode material for aqueous SIBs. Electrochemical properties of the material in high-concentration aqueous electrolyte (6 M NaClO 4 ) are systematically investigated by using cycling voltammetry , galvanostatic technique and electrochemical impedance spectroscopy . It is found that it shows an improved charge/discharge performance with a high practical capacity of 104.6 mAh g −1 at 100 mA g −1 , excellent high-rate capability with a reversible capacity of 88.0 mAh g −1 at 2000 mA g −1 , and good cycling stability with 92% capacity retention after 100 cycles. The improved electrochemical performance is attributed to the synergetic contribution of carbon-blending nanostructure and high-concentration electrolyte, which largely enhances structural stability and reaction kinetics of the material. In addition, the redox mechanism is discussed based on experimental results from cyclic voltammetry and X-ray diffraction technique.
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JOURNAL OF FOOD PROCESS ENGINEERING
·
2019
·Vol. 43
·期 5
·e13081
·
IF 1.448
Weijun Chen,Haiyang Wang,Wenjun Wang,Xiaobin Ma,Mingming Guo,Tian Ding,Xingqian Ye,Donghong Liu
The binding affinity of whey protein isolate (WPI) for (-)-epigallocatechin-3-gallate (EGCG) and the antioxidant activity of the formed complexes as influenced by ultrasound pretreatment were investigated. After treated by ultrasound at 200 W for 20 min, the apparent binding constant and the number of binding sites could be increased by 10.92 times and 23.05%, respectively. This indicated that ultrasound pretreatment did enhance the binding interaction between WPI and EGCG. Ultrasound pretreatment could increase the random coil content, cause the molecular unfolding and expose more hydrophobic groups inside the molecules to be exposed to the surface. These ultrasound-induced conformational changes observed in WPI might account for its enhanced binding affinity for EGCG. Moreover, complexing with WPI could protect EGCG antioxidant activity and better protection was observed for that of ultrasound pretreated WPI. This study confirmed that ultrasound pretreatment could help the design of WPI based delivery system for EGCG. Practical applications Due to its good ligand-binding properties, whey protein isolate (WPI) have great potential being used as a protective carrier for (-)-epigallocatechin-3-gallate (EGCG) via the formation of WPI-EGCG complexes. As a relatively low-cost, nonhazardous, and ecofriendly technique, ultrasound has been widely applied in the modification of WPI. However, the interaction between WPI and EGCG as influenced by ultrasound pretreatment is still unknown. In this study, the effects of ultrasound pretreatment on binding capacity of WPI for EGCG and the antioxidant activity of the formed complex were investigated. The results showed that the binding interaction between WPI and EGCG could be enhanced by ultrasound pretreatment. Moreover, complexing with WPI could provide preservation of EGCG antioxidant activity and better protection were obtained by complexing EGCG with ultrasound pretreated WPI. These results were helpful for the utilization of WPI as a protective vehicle for EGCG and other polyphenols in food industry.
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ADVANCED POWDER TECHNOLOGY
·
2019
·
IF 3.25
Kedir Ebrahim Ahmed,Dong-Hau Kuo,Worku Lakew Kebede
Heterojunction construction with low band gap materials is an effective way of utilizing UV light active materials under visible light irradiation. Here, we report the synthesis of Bi 2 (O,S) 3 /Zn(O,S) heterostructure using simple solvothermal method without surfactant. The catalysts were investigated with different characterization techniques. All the composite catalysts showed high light absorption capacity in the whole visible light spectrum. The catalytic activity of the catalysts was evaluated by Cr(VI) reduction. While pure Zn(O,S) catalyst showed no significant Cr(VI) reduction, higher photocatalytic activity than individual components were exhibited after heterojunction construction with Bi 2 (O,S) 3 . 20-BiZnOS catalyst with Bi/Zn molar percentage of 20% showed the best photocatalytic activity among the composites with 99.5% Cr(VI) reduction within 12 min under visible light irradiation. Heterojunction formation between Bi 2 (O,S) 3 and Zn(O,S) nanoparticle, and selective adsorption of Cr(VI) and desorption of Cr(III) on the surface of 20-BiZnOS composite catalyst were ascribed to the enhanced photocatalytic activity of the composite catalyst.
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ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Mingxia Liu,Hong Zhao,Zhiguo Zhang,Xiangjun Li,Lanqun Mao,Ruiping Zhang,Yuekui Wang
A new analytical method based on capillary zone electrophoresis-mass spectrometry (CZE-MS) was proposed and validated for the simultaneous determination of four stereoisomers of 3-hydroxyaspartate with two chiral centers in rat cerebrospinal fluid (CSF) in absence of optically pure single enantiomer standards. The derivatization reagent 9-fluorenylmethyl chloroformate (FMOC-Cl) was found to assist chiral separation and the derivatized enantiomers of 3-hydroxyaspartate can achieve enantioseparation with a lower concentration (6 mM) of β-cyclodextrin (β-CD), while underivatized 3-hydroxyaspartate cannot be separated. The enhanced interactions between derivatized analytes and β-CD were demonstrated by proton nuclear magnetic resonance ( 1 H NMR). The four stereoisomers of FMOC-3-hydroxyaspartate were identified successfully using a new method based on experimental and calculated electronic circular dichroism (ECD) spectra combined with the comparison of CE peak areas. Large volume sample stacking with polarity switching (LVSS-PS) was used to increase sensitivity and the detection limit of 356 nM was achieved for L-THA, which was around 10-fold improvement compared to the normal CE-MS analysis. The composition of the background electrolyte (BGE) was optimized by response surface methodology (RSM). Under the optimal conditions, satisfactory results of L-THA were obtained in terms of linearity over the range of 2–80 μM (R 2 > 0.99) and precision (RSD below 1.43% and 2.56% for migration time and peak area, respectively). The recoveries for all four stereoisomers in spiked rat CSF ranged from 91.2% to 99.5%. The method has been successfully applied to rat CSF analysis and D- erythro -3-hydroxyaspartate (D-EHA) was detected.
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高影响因子
EBioMedicine
·
2018
·
IF 6.183
Song-Yang Zhang,Yong-Qiang Dong,Pengcheng Wang,Xingzhong Zhang,Yu Yan,Lulu Sun,Bo Liu,Dafang Zhang,Heng Zhang,Huiying Liu,Wei Kong,Gang Hu,Yatrik M. Shah,Frank J. Gonzalez,Xian Wang,Changtao Jiang
The adipose Nod-like receptor protein 3 (NLRP3) inflammasome senses danger-associated molecular patterns (DAMPs) and initiates insulin resistance, but the mechanisms of adipose inflammasome activation remains elusive. In this study, Homocysteine (Hcy) is revealed to be a DAMP that activates adipocyte NLRP3 inflammasomes, participating in insulin resistance. Hcy-induced activation of NLRP3 inflammasomes were observed in both adipocytes and adipose tissue macrophages (ATMs) and mediated insulin resistance. Lysophosphatidylcholine (lyso-PC) acted as a second signal activator, mediating Hcy-induced adipocyte NLRP3 inflammasome activation. Hcy elevated adipocyte lyso-PC generation in a hypoxia-inducible factor 1 (HIF1)-phospholipase A2 group 16 (PLA2G16) axis-dependent manner. Lyso-PC derived from the Hcy-induced adipocyte also activated ATM NLRP3 inflammasomes in a paracrine manner. This study demonstrated that Hcy activates adipose NLRP3 inflammasomes in an adipocyte lyso-PC-dependent manner and highlights the importance of the adipocyte NLRP3 inflammasome in insulin resistance.
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