COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2014
·
IF 2.354
Chengcheng Ren,Fang Wang,Zhiqing Zhang,Huihui Nie,Nan Li,Mei Cui
A novel class of Gemini imidazolium surfactants 1,3-bis(3-alkylimidazolium-1-yl) propane bromide [C n -3-C n im]Br 2 ( n = 8, 10, 12) were synthesized and characterized by FT-IR, 1 H NMR and elemental analysis. The surface activity and aggregation behavior of [C n -3-C n im]Br 2 ( n = 8, 10, 12) were investigated by surface tension, conductivity and steady fluorescence methods. A series of surface active parameters, including cmc, Γ max , p C 20 , cmc/ C 20 , A min , γ cmc and Π cmc were obtained from surface tension measurement. It was indicated that Gemini imidazolium surfactants with the longer alkyl chain showed the higher surface activity. The thermodynamic parameters of micellization process, namely, standard Gibbs free energy (Δ G m ο ), enthalpy (Δ H m ο ) and entropy (Δ S m ο ) were derived from conductivity measurement at different temperatures. The micropolarity and the mean aggregation number ( N agg ) of micelles were evaluated from steady fluorescence spectra. The results revealed that the micropolarity and N agg of micelles decreased with the increase of hydrocarbon chain length.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2014
·Vol. 32
·期 11
·1550-1563
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IF 1.42
Yan Hua,Lu Chun-xiang,Jing De-qi,Hou Xiang-lin
Chemical degradation of diglycidyl ether of bisphenol A (DGEBA) epoxy resin cured with an aliphatic amine in supercritical 1-propanol was investigated under different reaction temperature and time. The combination of GC-MS and LC-MS proved that the epoxy resin was decomposed to five main products including phenol, 4-isopropylphenol, 4-isopropenylphenol, bisphenol A, and 4,4′-(cyclopropane-1,1-diyl)diphenol. The 13 C-NMR results verified the chemical structures of the degradation products. The change of the products’ yield with time was evaluated by an effective means of HPLC. In addition, the GPC analysis confirmed the formation of soluble low molecular weight clusters during the degradation reaction. A possible free-radical reaction mechanism was proposed for chemical depolymerization of the epoxy resin in supercritical 1-propanol. After the homolytic cleavage of the aromatic ether linkages, the resulting bisphenol A biradical either produced 4,4′-(cyclopropane-1,1-diyl)diphenol after intramolecular rearrangement or generated bisphenol A after capturing hydrogen from 1-propanol.
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FLUID PHASE EQUILIBRIA
·
2014
·
IF 2.241
Fufeng Cai,Jessica Juweriah Ibrahim,Lijing Gao,Ruiping Wei,Guomin Xiao
Methanol and dimethyl carbonate (DMC) mixture is present in the industrial manufacturing process of DMC, which is made from the catalytic oxidative carbonylation of methanol. The separation of methanol and DMC is important but difficult due to the formation of an azeotropic mixture. This work has been focused on a study of phosphoric-based ionic liquids (ILs) as green solvents for the separation of methanol and DMC in the extraction process. The knowledge of liquid–liquid equilibrium (LLE) of this mixture is essential for the design of the extraction separation process. For this reason, LLE data for the ternary systems {methanol + DMC + 1-methyl-3-methylimidazolium dimethylphosphate ([MMIM][DMP])} and {methanol + DMC + 1-ethyl-3-methylimidazolium diethylphosphate ([EMIM][DEP])} were measured at T = (298.2 and 313.2) K and atmospheric pressure. The solute distribution ratio and selectivity of the methanol, derived from the tie-lines data, were calculated and analyzed in order to evaluate the capacity of the studied ILs as solvents in liquid extraction process. The experimental results show that the values of selectivity for the studied ILs follow this order: [MMIM][DMP] > [EMIM][DEP]. Finally, the experimental LLE data for the studied ternary systems were compared with the calculated values obtained by means of the non-random two liquid (NRTL) model. The NRTL model was verified to accurately correlate the experimental LLE data.
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JOURNAL OF STRUCTURAL CHEMISTRY
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2015
·Vol. 56
·期 3
·458-462
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IF 0.508
Huang Q. -W.,Liu S. -G.,Li G. -B.,Wang S. -X.,Su W. -Y.,Liang D. -M.,Mao S. -Q.
A new complex Cu(bpbp)Cl 2 ·DMF·H 2 O is synthesized by treatment of CuCl 2 with 2,6-bis(1-phenylbenzimidazol-2-yl)pyidine in DMF. Its structure is characterized by elemental, IR, UV, and single crystal X-ray structure analyses. For the complex: crystal system, triclinic, space group \(P\bar 1\) , a = 1.0537(1) nm, b = 1.1735(1) nm, c = 1.3749(2) nm, α = 112.275(2)°, β = 91.531(2)°, γ = 97.700(2)°, V = 1.553(4) nm 3 , Z = 2. In a distorted trigonal bipyramidal geometry the Cu(II) ion is coordinated by three nitrogen atoms from 2,6-bis(1-phenylbenzimidazol-2-yl)pyridine and two chloride ions. The antiproliferative activities of the complex are screened by MTT assay against HepG2, Huh7, Eca109, and Eca9706 cancer cells. The complex exhibits specific inhibition on Eca9706 cancer cells with the IC 50 value of 28 μM after 48 h treatment. CCDC: 968927.
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Macromolecular Reaction Engineering
·
2017
·Vol. 11
·期 5
·1600055
·
IF 1.571
Qiaoqiao Sun,Lisong Wang,Ruihua Cheng,Zhen Liu,Xuelian He,Ning Zhao,Boping Liu
Phillips catalyst is one of the most significant industrial ethylene polymerization catalysts. Chemical modifications have been carried out to tune the Phillips catalyst performance and improve the polyethylene properties. After the modification of the catalyst by fluorine, the polyethylene product with higher molecular weight (MW) and narrower molecular weight distribution (MWD) is suitable for producing automobile fuel tanks. Vanadium containing Phillips catalyst enhances α-olefin incorporation and MW regulation. In present work, fluorine modified and unmodified chromium–vanadium (Cr–V) bimetallic catalysts are prepared and explored. Compared with the fluorine-free catalyst, the activities of F-modified bimetallic catalysts slightly decrease with the increasing MW of the product and the hydrogen response increases slightly. Due to the synergistic effect of the chromium, vanadium and fluorine on the silica gel support, the short-chain branch distribution (SCBD) of copolymers from F-modified Cr–V bimetallic catalyst (Cr–V–F) 600 is more beneficial than that of Cr–V bimetallic catalyst (Cr–V) 600 and F-modified Cr–V bimetallic catalyst (Cr–V–F) 500 . The fluorination of Cr–V bimetallic catalysts has not only preserved the high polyethylene activity of bimetallic active sites but also produced the advantage of the high MW ability from fluorine.
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INTERNATIONAL MICROBIOLOGY
·
2024
·
IF 2.3
Pan Lixu,Yuan Bo,Li Qingqing,Ouyang Ji,Yang Jie,Zhou Yan,Cui Changzheng
Chlorobenzene (CB), extensively used in industrial processes, has emerged as a significant contaminant in soil and groundwater. The eco-friendly and cost-effective microbial remediation has been increasingly favored to address this environmental challenge. In this study, a degrading bacterium was isolated from CB-contaminated soil at a pesticide plant, identified as Pandoraea sp. XJJ-1 (CCTCC M 2021057). This strain completely degraded 100 mg·L −1 CB and showed extensive degradability across a range of pH (5.0–9.0), temperature (10–37 °C), and CB concentrations (100–600 mg·L −1 ). Notably, the degradation efficiency was 85.2% at 15 °C, and the strain could also degrade six other aromatic hydrocarbons, including benzene, toluene, ethylbenzene, and xylene ( o- , m- , p- ). The metabolic pathway of CB was inferred using ultraperformance liquid chromatography, gas chromatography-mass spectrometry, and genomic analysis. In strain XJJ-1, CB was metabolized to o -chlorophenol and 3-chloroxychol by CB monooxygenase, followed by ortho- cleavage by the action of 3-chlorocatechol 1,2-dioxygenase. Moreover, the presence of the chlorobenzene monooxygenation pathway metabolism in strain XJJ-1 is reported for the first time in Pandoraea . As a bacterium with low-temperature resistance and composite pollutant degradation capacity, strain XJJ-1 has the potential application prospects in the in-situ bioremediation of CB-contaminated sites.
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MARINE ENVIRONMENTAL RESEARCH
·
2025
·
IF 3.2
Jiangbing Qiu,Chao Yin,Aifeng Li,Yongmeng Yang,Guixiang Wang,Dongyue Li
Diarrhetic shellfish toxins (DSTs) are widespread in marine environments, posing potential threats to marine ecosystems, shellfish aquaculture, and human health. Despite their prevalence, knowledge of the stability of dissolved DSTs in seawater is still limited. This study aimed to investigate the effects of bacteria, temperature, and irradiation on the stability of dissolved okadaic acid (OA) and dinophysistoxin-1 (DTX1) in seawater. Results indicated that bacteria did not contribute to the biodegradation of OA and DTX1, while their growth was inhibited by the toxins over the 7-day experiment. During a 28-day period without irradiation at 4°C, 20°C, and 37°C, no degradation of OA was observed, whereas significant degradation of DTX1 occurred, with concentrations dropping to 58% ∼ 78% of the initial concentration at the end of the experiment. Under xenon lamp irradiation at 1000 W, the concentrations of DTX1 decreased by 15% to 19% in seawater after 160 min, while the concentrations of OA showed minimal change. Conversely, both OA and DTX1 underwent significant degradation under mercury lamp irradiation with an irradiation intensity-dependent pattern. Additionally, the degradation rates of OA and DTX1 increased with higher concentrations of dissolved organic matter in the range of 1.2 to 15 mg C L⁻ 1 . This study enhances the understanding of DST stability in seawater under varying temperature and light conditions, highlighting the complexities involved in their degradation processes. The results of this study found that ultraviolet is an important driving environmental factor for OA and DTX1 degradation in the natural marine environment. In case of harmful algal blooms with associated phycotoxins, ultraviolet irradiation can be used as a removal method for OA and DTX1.
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Molecular Catalysis
·
2025
·
IF 4.9
Jingyi Chen,Wenyu Shao,Ziyu Zhang,Zhen Gao,Jiaxing Xu,Bin Wu
Processive endoglucanase with both endoglucanase and exoglucanase activity exhibits great potential in the degradation of cellulose. Carbohydrate Binding Modules (CBMs) can improve the catalytic efficiency by positioning the substrate closer to the catalytic domain and boosting the affinity between the enzyme and substrate. To investigate the impact of CBMs and linker peptides on the catalytic performance of the processive endoglucanase EG5C-1, various EG5C-1 derivatives with different CBMs and linker peptides were constructed. The results suggested the introduction of CBM1 from Volvariella volvacea and flexible peptide (GGGGS) 3 led to a notable 3.4-fold increase on the Avicel and a 3.7-fold increase on the overall enzymatic activity (FPase). In addition, the kinetic parameters of EG5C-1-F3- Vv CBM1 showed higher affinity ( K m ) and higher catalytic efficiency ( k cat / K m ) for insoluble substrates. Moreover, inverse kinetic parameters indicated that 99.5% of attack sites were occupied, surpassing the wild type. The processivity enhanced by 60% compared to EG5C-1. A series of cellooligosaccharides were hydrolyzed, with a pattern similar to EG5C-1. These results suggest that the fusing CBMs and linker peptides to the catalytic domain could effectively design a highly efficient processive endoglucanase.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Haihan Huang,Jie Zheng,Kaiyue Wu,Jian Lin,Xin Lin,Quan Yao,Qianyu Fan,Dechao Wang,Yuanbo Huang,Jianchun Jiang,Zhifeng Zheng
Catalytic pyrolysis technology is one of the most environmental and efficient approach in converting biomass waste into high-value chemicals and fuels. In this study, the ex-situ catalytic pyrolysis of cellulose to produce furans and olefins was reported using various metal-loaded TS-1 as catalysts. The experimental results showed that the Au/TS-1 exhibited an exceptional catalytic activity in the production of furans and olefins, achieving a selectivity of 49.17 % and 40.65 %, respectively. Ni/TS-1 effectively promoted the formation of ethylene, yielding a selectivity of 97.49 % and a yield of 6.11 C-mol%. Under the optimized conditions: pyrolysis temperature of 550 ℃, catalytic temperature of 600 ℃, and catalyst to cellulose mass ratio of 20:1, the Au/TS-1 catalyst achieved a furans selectivity of 41.91 % with a yield of 11.94 C-mol%, while olefins selectivity and yield were 49.84 % and 18.99 C-mol%, respectively. At this condition, Au/TS-1 still has excellent catalytic activity after 10 cycles and has good catalytic effect towards different biomass feedstocks. Furthermore, the possible mechanism to produce furans and olefins was revealed. This research offers valuable insights for guiding the directed conversion of biomass into value-added chemicals, paving the way for a more sustainable future.
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Regenerative Therapy
·
2024
·
IF 3.4
Min Ge,Li Sun,Defeng Wang,Chunchao Hei,Tingjuan Huang,Zhongxin Xu,Qizhi Shuai
The use of stem cell-based treatment systems is prevalent in regenerative medicine. To enhance the regenerative capabilities of stem cells, growth factors are typically incorporated into the treatment system. Nonetheless, traditional hydrogel-encapsulated or heparinized scaffolds that bind factors have limitations. In this study, we prepared a biomaterial strategy using uniform poly(lactic-co-glycolic) acid (PLGA) microspheres (uPLGA-Ms) fabricated by microfluidic to sustain delivery of insulin-like growth factor 1 (IGF-1), a critical protein for hMSCs biological functions. The uPLGA-Ms loaded IGF-1 were highly monodispersed through precise manipulation of the flow rate of the two-phase of the flow-focusing microchannle. The results showed that the uPLGA-Ms stabilize IGF-1 and provide a more efficient sustained delivery and cost-effective of growth factor. Gene expression analysis demonstrated the uPLGA delivery of IGF-1 results in a (enhanced) supported hMSCs expansion, survival, stemness, and secretion abilities comparable with the conventional soluble IGF-1 group. In summary, this material-based strategy to stabilize and sustain delivery of growth factor has broad potential to regeneration of various tissues and organs.
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ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Peiwen Li,Qiansheng Li,Hong Lu,Ze Fu,Jiti Zhou,Chenghao Sun,Xuehai Wang
Some nano-biochars (nano-BCs) as electron mediators could enter into cells to directly promote intracellular electron transfer and cell activities. However, little information was available on the effect of nano-BCs on SMX degradation. In this study, nano-BCs were prepared using sludge-derived humic acid (SHA) and their effects on SMX degradation by Shewanella oneidensis MR-1 were investigated. Results showed that nano-BCs (Carbon dots, CDs, <10 nm) synthesized using SHA performed a better accelerating effect than that of the nano-BCs with a larger size (10–100 nm), which could be attributed to the better electron transfer abilities of CDs. The degradation rate of 10 mg/L SMX in the presence of 100 mg/L CDs was significantly increased by 84.6% compared to that without CDs. Further analysis showed that CDs could not only be combined with extracellular Fe(III) to accelerate its reduction, but also participate in the reduction of 4-aminobenzenesulphonic acid as an intermediate metabolite of SMX via coupling with extracellular Fe(III) reduction. Meanwhile, CDs could enter cells to directly participate in intracellular electron transfer, resulting in 32.2% and 25.2% increases of electron transfer system activity and ATP level, respectively. Moreover, the activities of SMX-degrading enzymes located in periplasm and cytoplasm were increased by around 2.2-fold in the presence of CDs. These results provide an insight into the accelerating effect of nano-BCs with the size of <10 nm on SMX degradation and an approach for SHA utilization.
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Food Bioscience
·
2025
·
IF 5.9
Chunyun Qu,Jianjun Li,Fuxin Liu,Yu Zeng,Yiyin Xu,Weidong Bai,Hao Dong,Gongliang Liu
To diversify the aromas and enhance the quality of fruit wines, Zygosaccharomyces mellis LGL-1 (LGL-1), as a non-conventional yeast, was applied for fruit winemaking along with biochar facilitating the fermentation. Results demonstrated that LGL-1 exhibited higher synthesis of ethanol and esters compared to the commercial winemaking yeast CV171 during wampee/grape/litchi winemaking. Intriguingly, the main esters produced by LGL-1 were quite different from those of CV171, resulting in diverse flavors. Four kinds of food-grade biochar were applied to facilitate the fermentation of LGL-1 under the mimic solution of fruit juice (MSM medium) respectively, and results showed that the coconut shell granule biochar (G2) was the best choice with both substrate consumption and product formation improved significantly, especially with esters enhanced by 357.87%, owing to the reduced oxidation-reduction potential, improved intracellular ratio of NADH/NAD + and enhanced activities of esterase. When applied for wampee/grape/litchi winemaking, G2 could also facilitate the fermentation of LGL-1 with total content of esters in each wine improved by 173.7%, 71.8% and 44%. The total concentration of higher alcohols in wampee/grape wine was enhanced by 35.6% and 21.1%, but unchanged significantly in litchi wine. The content of total organic acids in grape wine and litchi wine was changed insignificantly but decreased by 16.7% in wampee wine, which might not affect the flavor based on the taste threshold of organic acids. Data above indicated that LGL-1 is a potential candidate for fruit winemaking, and the fermentation fortified by G2 is a promising method for improved aromas of fruit wine.
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