JOURNAL OF POLYMER SCIENCE
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2023
·Vol. 61
·期 9
·842-851
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IF 3.4
Zhoufeng Wang,Bolin Wang,Yingying Liu,Junwei Hu
A series of bisphenols, 4,4′-sulfobisphenol (BPS)/2,2-bis(4-hydroxyphenyl)butane (BPB) co-polyarylates with amorphous structures were synthesized from two BPS and BPB, and two different structures of benzoyl chloride monomers. The results of DFT calculations showed that the reaction activation energy of BPB with isophthaloyl chloride (IPC) and terephthaloyl chloride (TPC) was 8.05–8.40 Kcal/mol. The reaction activation energy of BPS with IPC and TPC was 38.73–39.09 Kcal/mol. GPC test results were consistent with theoretical calculations with BPS content from 0% to 15% resulting in a copolymer Mn of 22,000–11,600 and a Mw of 46,100–34,800. The intrinsic viscosity of co-polyarylates ranged from 0.55 to 0.71 dL/g. The glass transition temperature ( T g ) and 5% thermal weight loss of the co-polyarylates were 179.3–205.4 °C and 461.4–487.8 °C, respectively. Improved solubility of co-polyarylates in polar solvents. At the same time, the introduction of BPS did not result in any loss of mechanical properties, with Young's modulus in the range of 1444.32–1870.45 MPa, elongation at break in the range of 23.7%–30.8%, and tensile strength in the range of 52.21–59.38 MPa. Graphical
研究领域:
材料科学
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化学工程
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高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2016
·Vol. 181
·期 4
·1347-1359
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IF 1.606
Dai Yong,Huan Bin,Zhang Hai-Sheng,He Yu-Cai
To increase the biocatalytic activity of Escherichia coli CCZU-T15 whole cells, choline chloride/glycerol ([ChCl][Gly]) was firstly used as biocompatible solvent for the effective biotransformation of ethyl 4-chloro-3-oxobutanoate (COBE) into ethyl ( S )-4-chloro-3-hydroxybutanoate [( S )-CHBE]. Furthermore, L-glutamine (150 mM) was added into [ChCl][Gly]–water ([ChCl][Gly] 12.5 vol%, pH 6.5) media instead of NAD + for increasing the biocatalytic efficiency. To further improve the biosynthesis of ( S )-CHBE (>99 % e.e. ) by E. coli CCZU-T15 whole cells, Tween-80 (7.5 mM) was also added into this reaction media, and ( S )-CHBE (>9 % e.e. ) could be effectively synthesized from 2000 and 3000 mM COBE in the yields of 100 and 93.0 % by whole cells of recombinant E. coli CCZU-T15, respectively. TEM image indicated that the cell membrane was permeabilized and lost its integrity and when the cell was exposed to [ChCl][Gly]–water media with Tween-80. Clearly, this bioprocess has high potential for the effective biosynthesis of ( S )-CHBE (>99 % e.e. ).
研究领域:
生物化学
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合成生物学
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PubMed
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Zhigang Yin,Yuehua Hu,Wei Sun,Chenyang Zhang,Jianyong He,Zhijie Xu,Jingxiang Zou,Changping Guan,Chenhu Zhang,Qingjun Guan,Shangyong Lin,Sultan Ahmed Khoso
A novel compound 4-amino-5-mercapto-1,2,4-triazole was first synthesized, and its selective adsorption mechanism on the surface of chalcopyrite was comprehensively investigated using UV–vis spectra, zeta-potential, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy measurements (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), and first principles calculations. The experimental and computational results consistently demonstrated that AMT would chemisorb onto the chalcopyrite surface by the formation of a five-membered chelate ring. The first principles periodic calculations further indicated that AMT would prefer to adsorb onto Cu rather than Fe due to the more negative adsorption energy of AMT on Cu in the chalcopyrite (001) surface, which was further confirmed by the coordination reaction energies of AMT-Cu and AMT-Fe based on the simplified cluster models at a higher accuracy level (UB3LYP/Def2-TZVP). The bench-scale results indicated that the selective index improved significantly when using AMT as a chalcopyrite depressant in Cu−Mo flotation separation.
研究领域:
矿物学
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表面化学
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材料科学
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计算化学
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PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2019
·
IF 3.714
He Li,Xiang-Yi Tang,Chun-Jian Wu,Shu-Juan Yu
The 2,3-dihydro-3,5-dihydroxy-6-methyl-4(H)-pyran-4-one (DDMP) is one of the Mallard reaction product with intense bitter and strong antioxidant activity . Insight into DDMP formation pathways is important to manage Maillard reaction products quality. In this work, wet- and dry-heating glucose-amino acid model reactions were investigated to understand the DDMP formation pathways. Lysine and proline facilitated the DDMP generation in wet- and dry-heating system, respectively, suggesting the reaction intensity and amino acid properties are primary factors mediating DDMP generation. Fundamental mechanism on DDMP formation or inhibition was evaluated via quantitatively monitoring enolization products, which suggested that the formation of DDMP was facilitated at lower moisture content condition caused by more 1-deoxyglucosone (1-DG) generation via 2,3-enolization. However, increasing moisture content resulted in the decay of DDMP because of the transformation of 2,3-enolization to 1,2-enolization, which inhibited DDMP generation but transformed to form 5-hydroxymethylfurfural (HMF).
研究领域:
食品科学
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生物化学
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DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Peihang Shen,Zelong Liu,Yibo Zhang,Zelin Meng,Mingyang Song,Heming Zhao,Jianglei Hu,Fengwei Shi
Vinyl-functionalized SBA-15 was synthesised using a one-pot co-condensation method followed by carboxylation via nitric acid, with the intermediate product named SBA-15C. MIL-68 was then synthesised in-situ by adsorption of Al 3 + ions via carboxylate groups on SBA-15C to give the composite xMIL-68(Al)@SBA-15C. A series of characterizations were conducted by Fourier transform infrared spectroscopy, Brunner-Emmet-Teller measurements, X-ray diffraction, X-ray photoelectron spectroscopy, Scanning electron microscope, and Transmission Electron Microscope. xMIL-68(Al)@SBA-15C maintained robust catalytic performance in the NaBH 4 -mediated reduction of 4-nitrophenol to 4-aminophenol, with no significant decrease in activity after five cycles of reuse.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Yu-Cai He,Zhi-Cheng Tao,Jun-Hua Di,Liang Chen,Lin-Bing Zhang,Dan-Ping Zhang,Gang-Gang Chong,Feng Liu,Yun Ding,Chun-Xia Jiang,Cui-Luan Ma
It was the first report that the concentrated hydrolyzates from the enzymatic hydrolysis of dilute NaOH (3 wt%)-soaking rice straw at 30 °C was used to form [Bmim]PF 6 -hydrolyzate (50:50, v/v) media for bioconverting ethyl 4-chloro-3-oxobutanoate (COBE) into ethyl ( R )-4-chloro-3-hydroxybutanoate [( R )-CHBE] (>99% e.e. ) with recombinant E. coli CCZU-A13. Compared with pure glucose, the hydrolyzates could promote both initial reaction rate and the intracellular NADH content. Furthermore, emulsifier OP-10 (20 mM) was employed to improve the reductase activity. Moreover, Hp-β-cyclodextrin (0.01 mol Hp-β-cyclodextrin/mol COBE) was also added into this bioreaction system for enhancing the biosynthesis of ( R )-CHBE from COBE by E. coli CCZU-A13 whole-cells. The yield of ( R )-CHBE (>99% e.e. ) from 800 mM COBE was obtained at 100% in the [Bmim]PF 6 -hydrolyzate (50:50, v/v) media by supplementation of OP-10 (20 mM) and Hp-β-CD (8 mM). In conclusion, an effective strategy for the biosynthesis of ( R )-CHBE was successfully demonstrated.
研究领域:
生物化学
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微生物学
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DOI
高影响因子
ACS Omega
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2025
·
IF 4.3
Qingquan Guo,Yudong Zhang,Chuanjin Tang,Qiuru Li,Fei Liu,Zhenming He,Chenyang Jiang,Jun Xu,Haishan Zhao
This study investigates the skin-whitening potential of 4-Hydroxyacetophenone (4-HAP), a compound commonly used as a preservative in cosmetics. Despite its widespread use, its whitening activity has not been extensively reported. Our preliminary research identified several commercial cosmetic formulations exhibiting whitening effects without known whitening agents. We hypothesized that 4-HAP might be a key ingredient. To test this, we employed a mushroom tyrosinase model, B16 mouse melanoma cells, and zebrafish to systematically evaluate the whitening activity of 4-HAP. Our findings demonstrate that 4-HAP is a potent tyrosinase inhibitor, significantly reducing melanin content in vitro and in vivo. Additionally, molecular docking and dynamics analyses revealed that the stable binding of 4-HAP to tyrosinase is crucial for its whitening effect. In formulations containing 2% 4-HAP, human skin models showed nearly complete recovery from UV-induced pigmentation after 4 weeks, while control groups exhibited persistent UV marks. These results confirm the efficacy of 4-HAP as a stable whitening agent in cosmetic formulations, highlighting its potential for further development in skin lightening products. This study has confirmed that 4-HAP holding the potential to become an effective whitening ingredient in the cosmetics field.
研究领域:
化妆品科学
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生物化学
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药理学
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分子生物学
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皮肤科学
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DOI
PubMed
高影响因子
BIOORGANIC CHEMISTRY
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2025
·
IF 4.7
Can Yang,Haiqi Xu,Puchen Zhao,Qin Yin,Na Wang,Lizi Li,Yan Liu,Yanfang Li
2′,4′-dimethoxy-4-hydroxychalcone ( 15b ) has been previously reported as a reversible competitive inhibitor of xanthine oxidase (XOD) with potent activity (> 10-fold vs. allopurinol), but its molecular interactions with the enzyme active site remain uncharacterized. In this research, an integrated approach consisting of multiple spectroscopic methods, isothermal titration calorimetry (ITC), and computer simulations was employed to investigate the binding mode of 15b on XOD. Consequently, ITC data confirmed that the stable 15b -XOD complex was formed spontaneously and driven mainly by hydrophobic interactions with the dissociation constant of the magnitude of 10 −7 mol·L −1 . Three-dimensional fluorescence and circular dichroism spectroscopy indicated that 15b binding induced a conformational transition in the XOD backbone , leading to an increase in global flexibility characterized by enhanced random coil and reduced α-helix/β-sheet. Synchronous fluorescence analysis demonstrated that 15b preferentially perturbed the microenvironment of tyrosine residues over tryptophan residues in XOD. Molecular docking studies (PDB: 1N5X , 2.5 Å) revealed that 15b occupied the xanthine access channel near the molybdenum-pterin (Mo-pt) center, forming critical hydrogen bonds with Arg880 and Thr1010. This binding sterically obstructed substrate xanthine access and subsequent uric acid production. Molecular dynamics simulations indicated that 15b formed a stable binding complex with XOD. Notably, 15b likely bound at the dimer interface and induced inter-subunit proximity, whereas 15b binding preserved the integrity of the surface polarity topology. Furthermore, 15b showed no cytotoxicity in AML-12 hepatocytes at 20 μmol·L −1 (cell viability >90 %) , while suppressing uric acid production (> 40 % reduction at 20 μmol·L − 1 ) . These findings may enrich the interaction mechanism of 15b with XOD and also provide a theoretical basis for ligand-guided design of future novel XOD inhibitors.
研究领域:
生物化学
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结构生物学
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药理学
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生物物理
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计算生物学
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酶学
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DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Danlian Huang,Xingmeng Qin,Piao Xu,Guangming Zeng,Zhiwei Peng,Rongzhong Wang,Jia Wan,Xiaomin Gong,Wenjing Xue
A composting study was performed to investigate the degradation of 4-nonylphenol (4-NP) in river sediment by inoculating Phanerochaete chrysosporium ( Pc ). Pc was inoculated into composting Reactor A, C and D, while Reactor B without inocula was used as control. The results showed that composting with Pc accelerated the degradation of 4-NP, increased the catalase and polyphenol oxidase enzyme activities in contaminated sediment. The dissipation half-life (t 1/2 ) of 4-NP in Reactor A, C and D with inocula of Pc were 2.079, 2.558, 2.424 days, while in Reactor B without inocula of Pc it was 3.239 days, respectively. Correlation analysis showed that the contents of 4-NP in sediment in Reactor A and D were negatively correlated with the actives of laccase, whereas no obvious correlation was observed in Reactor B and C. All these findings also indicated that Pc enhanced the maturity of compost, and the best composting C/N ratio was 25.46:1.
研究领域:
环境科学
·
微生物学
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Ren Suyu,Jin Xiaojie,Bekele Tadiyose Girma,Lv Min,Ding Jing,Tan Feng,Chen Lingxin
4-Methylbenzylidene camphor (4-MBC), a typical organic UV filter (OUVF) in personal care products, is considered to be a potential endocrine disruptor due to its estrogenic activity and bioaccumulation. Although 4-MBC residues have been extensively identified in aquatic waters, little is known about their occurrence, levels, and potential risk in coastal waters. This study developed a reliable sampling approach, based on diffusive gradients in thin films (DGT) with XAD-2 as the binding agent, for monitoring 4-MBC in coastal waters. The diffusion coefficients of 4-MBC in freshwater and artificial seawater were 3.65 × 10 −6 cm 2 /s and 3.83 × 10 −6 cm 2 /s, respectively. XAD-2 binding gel showed rapid adsorption to 4-MBC. The accumulated masses of 4-MBC in XAD-2 DGT increased linearly with deployed time for 7 days in freshwater and seawater, which agreed well with theoretical predictions. The sampling performance was independent of ionic strength (0.0001–0.5 M), pH (4.0–8.5), and dissolved organic matter (0–20 mg/L). Field deployment in the river estuary and bathing beach showed that DGT-measured 4-MBC concentrations were consistent in comparison with grab sampling. Environmental risk assessment showed that 4-MBC may pose a medium risk to aquatic organisms based on computed risk quotient (RQ) values. Sewage discharge is the main source of 4-MBC risk, while the residue in recreation beaches contributes more significantly in summer. The established DGT sampling is suitable for seasonal monitoring, source identification, and risk assessment of 4-MBC in coastal waters. Graphical abstract
研究领域:
环境科学
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分析化学
·
水质
·
毒理学
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PubMed
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2021
·
IF 3.247
Binchao Lu,Liang Wang,Xin Zheng,Zhongce Hu,Zhiyan Pan
Environmental contamination by 4-chlorophenol (4-CP) is a major concern. Photosynthetic bacteria have the ability to biodegrade 4-CP under dark aerobic conditions. In this study, we found that using different carbon sources (i.e. glucose, sodium acetate, sodium propionate sucrose, and malic acid) as co-metabolic substrates accelerated the biodegradation of 4-CP, and this acceleration was especially pronounced in the glucose treatment. A maximum degradation rate of 96.99% was reached under a concentration of 3.0 g·L−1 after 6 days of culture. The optimum conditions were pH 7.5, a temperature of 30°C, and a rotation speed of 135 rpm. The biodegradation of 4-CP was achieved at a range of salinities (0–3.0% NaCl, w/v). The biodegradation kinetics agreed with the Haldane model, and the kinetic constants were rmax = 0.14 d−1, Km = 33.9 mg·L−1, and Ki = 159.6 mg·L−1. Additionally, the coexistence of phenol or 2,4-dichlorophenol (2, 4-DCP) had a certain impact on the degradation of 4-CP under dark aerobic conditions. When the coexisting phenol concentration reached 100 mg·L−1, the maximum degradation rate of 4-CP reached 90.20%. The degradation rate of 4-CP decreased as the concentration of coexisting 2, 4-DCP increased.
研究领域:
环境科学
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微生物学
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PubMed
高影响因子
Science China-Materials
·
2022
·Vol. 65
·期 9
·2585-2590
·
IF 8.64
Chen Zilong,Zeng Hao,Chu Dongdong,Zhang Fangfang,Cheng Meng,Yang Zhihua,Pan Shilie
A new deep-ultraviolet (DUV) birefringent crystal, LiB 5 O 5 F 2 (OH) 4 (LBOFH), was designed and synthesized by a high-temperature solution method. Its structure features a [B 5 O 5 F 2 (OH) 4 ] anionic group that is constructed by four π-conjugated units, i.e., two [BO 3 ] units and two [BO(OH) 2 ] units connected by the [BO 2 F 2 ] unit, which forms a near-coplanar configuration. The group exhibits large anisotropic polarizability and highest unoccupied molecular orbital-lowest unoccupied molecular orbital (HUMO-LUMO) gap, thus providing a good balance between the large birefringence (0.124 at 546 nm) and band gap (7.99 eV) in LBOFH. This work suggests new possibilities for the design and fabrication of advanced DUV birefringent crystals using the novel anionic group and the expansion of their alternative system with new hydroxyfluorooxoborates.
研究领域:
材料科学
·
晶体学
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高影响因子
危险品化学品经营许可证（带存储）