JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Yi Yu,Xiaoqiang Gao,Zhouxuan Zang,Li Xu,Guoji Liu
In this work, the solubility of 2-methyl-1,4-naphthoquinone (2-MNQ, Vitamin K3) and its by-product 2-naphthaldehyde in binary and ternary systems was studied. Three phase diagrams were established based on the experimental solubility data. Each ternary phase diagram contains three crystallization regions (pure 2-MNQ, pure 2-naphthaldehyde and mixture of 2-MNQ and 2-naphthaldehyde), two co-saturated curves and one co-saturated point. The crystalline region of 2-MNQ is larger than that of 2-naphthaldehyde at three temperatures (283.15, 293.15 and 303.15) K. The solubility of the binary (2-MNQ + ethanol and 2-naphthaldehyde + ethanol) system was correlated by λh equation, modified Apelblat equation and NRTL model. The ternary (2-MNQ + 2-naphthaldehyde + ethanol) system was correlated by NRTL model. The calculated values agree well with the determined solubility data. Interaction energy between solute and solvent molecules were calculated to illustrate the solubility behavior of 2-MNQ and 2-naphthaldehyde in ethanol. RDF shows that when adding pure 2-naphthaldehyde in solution of 2-MNQ + ethanol, the interaction between 2-MNQ and ethanol molecules will become stronger, which leads to an increase in solubility of 2-methyl-1,4-naphthoquinone. This study can provide basic data and theoretical foundation for the separation process.
研究领域:
化学工程
·
分子生物学
·
药物化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Sicheng Liang,Li Liu,Bing He,Wenjing Zhao,Wei Zhang,Lijun Xiao,Mingming Deng,Xiaoling Zhong,Su Zeng,Xiaoyi Qi,Muhan Lü
Oral intake of 1,4-naphthoquinones could be a potential risk factor for hyperuricemia and gout via activation of xanthine oxidase (XO). Herein, 1,4-naphthoquinones derived from food and food-borne pollutants were selected to investigate the structure and activity relationship (SAR) and the relative mechanism for activating XO in liver S9 fractions from humans (HLS9) and rats (RLS9). The SAR analysis showed that introduction of electron-donating substituents on the benzene ring or electron-withdrawing substituents on the quinone ring improved the XO-activating effect of 1,4-naphthoquinones. Different activation potential and kinetics behaviors were observed for activating XO by 1,4-naphthoquinones in HLS9/RLS9. Molecular docking simulation and density functional theory calculations showed a good correlation between -LogEC 50 and docking free energy or HOMO-LUMO energy gap. The risk of exposure to the 1,4-naphthoquinones was evaluated and discussed. Our findings are helpful to guide diet management in clinic and avoid adverse events attributable to exposure to food-derived 1,4-naphthoquinones.
研究领域:
营养学
·
毒理学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FLUID PHASE EQUILIBRIA
·
2015
·
IF 2.2
Fang Zhang,Long Wang,Yaocun Tang,Xiaoqiang Gao,Li Xu,Guoji Liu
The solid–liquid equilibrium or the ternary system of 2-methyl-1,4-naphthoquinone + phthalic anhydride + acetone were determined at three temperatures of (283.15, 293.15 and 303.15) K, respectively. Three isothermal phase diagrams of the system were constructed on the basis of the measured solubility. Two pure solid phases were formed at (283.15, 293.15 and 303.15) K, including pure PA and pure 2-MNQ, which were confirmed and determined by the method of Schreine makers' wet residue. The densities of equilibrium liquid phase were determined experimentally at the corresponding temperatures versus mass fraction of component. The phase diagram at 283.15 K is similar to those at (293.15 and 303.15) K and the crystalline fields of 2-MNQ and PA decrease with an increase in temperature. The ternary diagram can provide the fundamental basis for separation of 2-MNQ and PA.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhimin Li,Guanhui Chen,Huan Yang,Congcong Meng,Ziyu Zhang,Shengwei Wang,Hongshan Chen,Zhongai Hu
Reducing the loss of active components in electrode materials is an important goal of electrode design and material optimization for electrochemical energy storage devices. All-solid-state devices have rapidly developed in recent years, maintaining high energy density while offering a certain level of safety. Meanwhile, as a new kind of alternatives in active components, organic active small molecules have a significant advantage, such as a wide range, less difficult preparation by solvent method and low cost. In this study, a flexible frame with rich hydroxyl groups (polyvinyl alcohol, PVA) bondage electrochemically active small molecule (2,3-dichloro-1,4- naphthoquinone, DNQ) acting by hydrogen bonding and nano-conductive sheets (reduced graphene oxide, rGO) as electron transfer agent in the hydrogel electrode (DNQ/rGO/PVA-2) has been successfully built. The electrode demonstrated good flexibility and an area sensitivity of 618.2 mF/cm 2 at the current density of 1 mA/cm 2 . After 10,000 charge/discharge cycles, it still maintained 91.1 % stability. The SEM images and XPS analysis after cycling test indicated that the designed structure is stable and effective. An all-solid-state flexible symmetric supercapacitor was assembled using the layer-stacked assembly method. It has an energy density of 49.5 μWh/cm 2 and does not significant capacitance loss when bent at different angles. The DNQ/rGO/PVA-2 hydrogel synthesized exhibits excellent electrochemical and mechanical properties, making it an ideal candidate for flexible supercapacitors.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2017
·Vol. 22
·期 5
·798
·
IF 2.861
Jia Wang,Guangzhi Zeng,Xiaobing Huang,Zhe Wang,Ninghua Tan
Plant-parasitic nematodes are destructive pathogens causing enormous economic losses worldwide. With the withdrawal of fumigants, organophosphates and carbamates, pathogenic nematode control is more difficult. Phytochemicals are the plant secondary metabolites and are friendly for men and the environment. For developing new nematocidal candidates, we screened 790 phytochemicals using the model organismCaenorhabditis elegansand found 10 active compounds, 3 of which were further evaluated for their inhibitory activities against egg hatching ofC. elegansand J2Meloidogyne incognita.Among them, 1,4-naphthoquinone (1,4-NQ) was the only compound that could kill more than 50% of targets at 50 μg/mL, prompting us to investigate how 1,4-NQ triggers nematode lethality. InC. elegans, we observed that 1,4-NQ could influence reactive oxygen production, superoxide dismutase activity, and the heat-shock transcription factor (HSF)-1 pathway, which indicated that 1,4-NQ stimulated significant oxidative stress. Furthermore, using quantitative RT-PCR and transgenetic nematodes, we revealed that 1,4-NQ lethality was related to the Insulin/IGF signaling (IIS) pathway, and the effect of 1,4-NQ on IIS pathway related genes indicated that 1,4-NQ could activate this pathway and suppress the expression of DAF-16 target genes. The triggering of oxidative stress and activation of the IIS pathway indicated that 1,4-NQ operates through the generation of oxygen radicals, which can be lethal toC. elegans, thus making it an interesting lead compound for the development of future nematocides.Keywords:plant-parasitic nematode;phytochemical;nematocidal;1,4-naphthoquinone;oxidative stress;insulin/IGF signaling pathway;Caenorhabditis elegans
研究领域:
植物科学
·
分子生物学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2024
·
IF 8.3
Tian Gao,Ping Fu,Wan-Long Li,Wan-Ting Lin,Yuan-Hui Yu,Xiao-Jun Huang,Zhi-Kang Xu,Ling-Shu Wan
Nanofiltration (NF) membranes with superior permeability and selectivity are highly desirable for the applications. The development of non-polyamide loose NF membranes with high permeability and dye/salt selectivity has aroused great attention in recent years. In this work, 2-hydroxy-1,4-naphthoquinone, a natural compound commonly existed in plants, was chosen to prepare loose NF membranes via the co -deposition with polyethyleneimine (PEI). By optimizing the deposition conditions, we successfully fabricated amine-quinone network coatings on the surface of polyacrylonitrile (PAN) ultrafiltration membranes, and further cross-linked the coatings with glutaraldehyde to improve the compactness and stability. For this kind of loose NF membrane, the rejections to dyes with a molecular weight larger than 600 Da reach 98 %, and the water permeance keeps above 10 L·m −2 ·h −1 ·bar −1 . In contrast, the rejections to inorganic salts (NaCl, Na 2 SO 4 , MgCl 2 , and MgSO 4 ) are only about 10 %, and the selectivity of the dye molecule alcian blue against NaCl can reach 430. These results prove that this novel composite membrane can realize effective separation for dyes with different molecular weights and desalination for dye solutions. The present work will open up an avenue for designing loose NF membranes with novel separation layers.
研究领域:
膜科学
·
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Fang Zhang,Yanqing Zhu,Yi Yu,Li Xu,Guoji Liu
The solid–liquid equilibria (SLE) in the ternary system of 2-methyl-1,4-naphthoquinone (2-MNQ) + phthalic anhydride (PA) + 1,4-dioxane were determined experimentally by using the isothermal dissolution equilibriam method within temperatures 283.15, 293.15, and 303.15 K, respectively. The ternary phase diagram could be helpful in the separation of 2-MNQ and PA. On the basis of the experimental data on solubilities the phase diagrams of the system were plotted. Two pure solid phases were formed at 283.15, 293.15 and 303.15 K, including pure PA and pure 2-MNQ, which were confirmed and determined by Schreinemakers’ wet residue method. The phase diagram at 283.15 K is similar to those at 293.15 and 303.15 K and the crystalline regions of 2-MNQ and PA decrease with increasing temperature. NRTL and Wilson model were employed to correlate and calculate the solubility data for the ternary system. A comparison between the two models shows that the NRTL model agrees better with the experimental data than those with the Wilson model. In addition, the densities of equilibrium liquid phase were obtained at the corresponding temperatures versus composition in the system.
研究领域:
化学工程
·
物理化学
·
热力学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yi Sun,Junfeng Su,Amjad Ali,Tinglin Huang,Shuai Zhang,Yitian Min
The coexistence of multiple pollutants and lack of carbon sources are challenges for the biological treatment of wastewater. To achieve simultaneous removal of nitrate (NO 3 − -N) and cadmium (Cd 2+ ) at low carbon to nitrogen (C/N) ratios, 2-hydroxy-1,4-naphthoquinone (HNQ) was selected from three redox mediators as an accelerator for denitrification of heterotrophic strain Pseudomonas stutzeri sp. GF2 and autotrophic strain Zoogloea sp. FY6. Then, halloysite nanotubes immobilized with 2-hydroxy-1,4-naphthoquinone (HNTs-HNQ) were prepared and a bioreactor was constructed with immobilized redox mediator granules (IRMG) as the carrier, which was immobilized with HNTs-HNQ and inoculated with the two strains. The immobilized HNQ and the inoculated strains jointly improved the removal ability of NO 3 − -N and Cd 2+ and the removal efficiency of NO 3 − -N (25.0 mg L −1 ) and Cd 2+ (5.0 mg L −1 ) were 92.81% and 93.94% at C/N = 1.5 and hydraulic retention time (HRT) = 4 h. The Cd 2+ was removed by adsorption of iron oxides (FeO(OH) and Fe 3 O 4 ) and IRMG. The electron transport system activity (ETSA) of bacteria was improved and the composition of dissolved organic matter in the effluent was not affected by HNQ. The HNQ promoted the production of FeO(OH) and up-regulated the proportion of Zoogloea (54.75% in the microbial community), indicating that Zoogloea sp. FY6 was dominant in the microbial community . In addition, HNQ influenced the metabolic pathways and improved the relative abundance of some genes involved in nitrogen metabolism and the iron redox cycle.
研究领域:
环境工程
·
微生物学
·
污水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-10
·
IF 4.259
Yang Li,Cai Tianming,Ding Dahu,Cai Tianjin,Jiang Canlan,Li Hua,Yang Qian,Chen Liwei
2-hydroxy-1,4 naphthoquinone (lawsone) is widely used and induces environmental pollutions during its production and application. In the present study, a lawsone-degrading bacterium strain, LH-3 was successfully isolated from the activated sludge. Based on the 16S rRNA gene analysis, the strain LH-3 phylogenetically belonged to the Pseudomonas taiwanensis . It could degrade 200 mg L −1 lawsone completely in 9 h with an inoculum quantity of 1% (v/v). The effects of environmental conditions on the degradation process and the degradation pathway were systematically investigated. LH-3 could maintain its high degradation efficiency under high salt condition. The identified intermediates of salicylic acid, 2-hydroxy-4-oxo-chroman-2-carboxylic acid, and catechol elucidated the potential degradation pathway. Furthermore, the immobilized LH-3 strain cells prepared with alginate gel and biochar performed excellent stability in nine successive degradation runs. It could sucessfully survive in laboratory scale sequencing batch reactor and become to be the dominant species. This study clearly revealed that LH-3 could serve as an attractive candidate for the microbial remediation of lawsone-containing wastewater.
研究领域:
环境微生物学
·
生物修复
·
废水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）