Catalysts
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2023
·Vol. 13
·期 5
·809
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IF 3.9
Elrasheed Elhaj,Huajun Wang,Enaam A. Al-Harthi,Waseem A. Wani,Sahar Sallam,Nasser Zouli,Mohd Imran
In this work we demonstrate one-pot glycidol synthesis, via trans-esterification between glycerol and dimethyl carbonate, by making use of commercially available sodium methoxide as a catalyst. An excellent glycerol conversion (99%) and remarkable glycidol yield (75%) was obtained using dimethyl carbonate/glycerol (molar ratio 2:1) in the presence of 3 wt% catalyst amount (with respect to glycerol weight) at 85 °C for a reaction time of 120 min. Sodium methoxide was recycled and reused twice with only a slight decrease in glycerol conversion. The water content of the glycerol reached 2.5 wt%; this did not reduce the glycerol conversion efficiency of the catalyst. A plausible mechanism for the trans-esterification involved in the preparation of glycidol was proposed.Keywords:glycerol carbonate;one-pot glycidol synthesis;sodium methoxide-catalysed;stability of sodium methoxide catalyst;trans-esterification of glycerol
研究领域:
化学工程
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催化化学
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Xiaojing Lv,Jianghai Lin,Liang Luo,Dou Zhang,Senlin Lei,Wenjuan Xiao,Yuan Xu,Yingxue Gong,Zehuan Liu
Sodium methoxide ( CH 3 ONa) with glycerol pretreatment (CWGP) was performed to improve the enzymatic digestibility of sugarcane bagasse (SCB). Response surface methodology was utilized to optimize the CWGP parameters for pretreating SCB from the perspective of total fermentable sugar yield (TFSY) and total fermentable sugar concentration (TFSC). Under the optimal CWGP conditions, 0.5666 g/g of TFSY (0.82% CH 3 ONa, 1.11 h, 150 °C) and 17.75 g/L of TFSC (0.87% CH 3 ONa, 1.38 h, 149.27 °C) were achieved, corresponding to delignification of 79.05% and 79.34%, respectively. Compared the pretreatment using glycerol or CH 3 ONa alone, the CWGP has significant synergies to enhance the enzymatic efficiency of SCB. The physical and chemical characteristics of untreated and pretreated SCBs were analyzed using FT-IR, XRD, and SEM, and the results suggest that CWGP significantly increased the susceptibility of the substrates to enzymatic digestibility. Ultimately, CWGP might be a prospective candidate for the pretreatment process of enzyme-based lignocellulosic biorefineries.
研究领域:
生物化学
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可再生能源
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生物质转化
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Ping Dai,Yuchao Yao,Enzheng Hu,Dongyan Xu,Zhongcheng Li,Chuansheng Wang
In this work, a composite consisting of ZIF-67 and graphene oxide (GO) was successfully synthesized by a facile in-situ synthesis method and applied in hydrogen release from the methanolysis of sodium borohydride (NaBH 4 ). Physicochemical properties of pure ZIF-67 and the ZIF-67@GO composites are well characterized by XRD, BET, SEM and HRTEM. It was observed that the ZIF-67 crystals are intimately anchored on GO sheets. An increase of GO in the composite led to a marked decrease of the BET surface area and an increased average pore size. However, the ZIF-67@GO precursor with high GO doping exhibited much higher activity toward the methanolysis of NaBH 4 , which suggests that the good conductivity of GO is beneficial to improve the catalytic performance. The ZIF-67@GO precursor experienced a structure reconstruction during the methanolysis reaction due to the presence of reducible Co 2+ . Moreover, the reduced ZIF-67@GO displayed a slightly higher activity as compared to the pristine composite and retained excellent durability after five cycles. A possible mechanism for the hydrogen generation from the methanolysis of NaBH 4 using a ZIF-67@GO catalyst was proposed.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
·
IF 3.898
Tengjie Wang,Wenkai Li,Xuehui Ge,Ting Qiu,Xiaoda Wang
High-purity ethylene carbonate (EC) is widely used as battery electrolyte, polycarbonate monomer , organic intermediate, and so on. An economical and sustainable route to synthesize high-purity ethylene carbonate (EC) via the transesterification of dimethyl carbonate (DMC) with ethylene glycol (EG) is provided in this work. However, this reaction is so fast that the reaction kinetics, which is essential for the industrial design, is hard to get by the traditional measuring method. In this work, an easy-to-assemble microreactor was used to precisely determine the reaction kinetics for the fast transesterification of DMC with EG using sodium methoxide as catalyst. The effects of flow rate, microreactor diameter, catalyst concentration, reaction temperature, and reactant molar ratio were investigated. An activity-based pseudo-homogeneous kinetic model, which considered the non-ideal properties of reaction system, was established to describe the transesterification of DMC with EG. Detailed kinetics data were collected in the first 5 min. Using these data, the parameters of the kinetic model were correlated with the maximum average error of 11.19%. Using this kinetic model, the kinetic data at different catalyst concentrations and reactant molar ratios were predicted with the maximum average error of 13.68%, suggesting its satisfactory prediction performance.
研究领域:
化学工程
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材料科学
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反应动力学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
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2024
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IF 4.3
Jiaxiang Liu,Wenqi Song,Huizhe Niu,Ying Lu,Haiyan Yang,Wentao Li,Yu-zhen Zhao,Zongcheng Miao
In order to facilitate the practical application of circularly polarized luminescence (CPL) active molecules, the CPL brightness (BCPL) must be optimized. We have applied a binary modular strategy to synthesize two chiral organo-Tb3+ complexes, [Tb(Coum)3(1R,2R-Ph-PyBox)] (2) and [Tb(Coum)3(1S,2S-Ph-PyBox)] (5), combining 3-acetyl-4-hydroxy-coumarin (Coum) and enantiopure 2,6-bis(4-phenyl-2-oxazolin-2-yl) pyridine (1R,2R/1S,2S-Ph-PyBox). The photophysical properties of these novel complexes have been fully characterized. The combined point-chiral induction capability of chiral bis(oxazoline) derivatives and the outstanding photophysical properties of the coumarin-derived ligand have resulted in an intense excited-state chiroptical activity (|glum| = 0.097–0.103) for both Tb3+ enantiomers, with a bright Tb3+-centered high-purity green emission (ΦPL = 74%) and enhanced antenna-centered absorption behavior (ε320 nm = 47820–47940 M–1 cm–1). A superior BCPL (1132.7–1205.8 M–1 cm–1 at 5D4 → 7F5) has been established for complexes 2 and 5. The strategy adopted in this work provides a new route to chiroptical organo-Tb3+ luminophores with outstanding comprehensive performance.
研究领域:
化学
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材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
Metabolites
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2024
·Vol. 14
·期 2
·96
·
IF 3.4
Chen Zeng,Wen-Jing Cai,Liu-Cheng Jiang,Tiantian Ye,Yu-Qi Feng
Gibberellins (GAs) play a pivotal role in modulating plant growth and development. Glucose–conjugated gibberellins (Glc–GAs), a prevalent conjugated form of GAs, regulate intracellular GA levels by the coupling and decoupling of glucose groups. However, the diversity of Glc–GAs identified within individual species remains limited, hinting at a multitude of yet undiscovered gibberellin metabolites. This lacuna poses considerable impediments to research efforts dedicated to comprehensively delineating the GA metabolic pathway. In this study, we developed a structure–oriented screening and identification method for Glc–GAs in plant species by employing LC–MS/MS coupled with chemical derivatization. Through the application of chemical derivatization technique, carboxyl groups on Glc–GAs were labeled which effectively enhanced the sensitivity and selectivity of mass spectrometry detection for these compounds. Concurrently, the integration of mass spectrometry fragmentation and chromatographic retention behavior facilitated the efficient screening and identification of potential Glc–GAs. With this strategy, we screened and identified 12 potential Glc–GAs from six plant species. These findings expand the Glc–GA diversity in plants and contribute to understanding GA metabolic pathways.
研究领域:
植物生理学
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分析化学
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植物化学
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产品关联
DOI
PubMed
高影响因子
BIOMACROMOLECULES
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2025
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IF 5.4
Yu Sun,Yushuang Shang,Xinyu Zhang,Zhaoyan Ge,Fengni Liu,Jian Shen,Jiang Yuan
Mimicked by the structure of dimethyl sulfoxide propionate (DMSP), a novel zwitterion monomer of N-methylacryloyl S-methyl l-cysteine methyl sulfonium salt (NMASMCMS) was synthesized and characterized for the first time through three steps using l-cysteine as a starting material. Poly(NMASMCMS) brushes were constructed on PET sheets via surface-initiated reversible addition–fragmentation chain-transfer (SI-RAFT) polymerization. The physical and chemical structures were characterized by water contact angle (WCA), attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). The polymer brush grafted sheets (PET-B) had good hydrophilicity and high lubricity. Moreover, PET-B sheets exhibited excellent antifouling and hemocompatible properties with low protein adsorption, bacterial adhesion, platelet adhesion, and hemolysis.
研究领域:
材料科学
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生物医学工程
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高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Matter
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2025
·
IF 17.5
Shang Chi,Yaping Li,Tingting Ye,Jiawei Kang,Zhihui Xiang,Xiaoqing Kuang,Chenggang Yi,Yiying Qi,Wei Wang
This work developed a de novo sonosensitizer based on carnosine_zinc piezoelectric metal-organic frameworks (PMOFs) that possesses a prominent reactive oxygen species (ROS)-generating function, biocompatibility, and degradability. Further, the PMOF was modified by a carbon monoxide (CO) donor through a metal complexation reaction to result in a multifunctional CO-PMOF to launch CO/ROS-mediated antimicrobial under ultrasound (US). However, the heat generated during sonodynamic therapy (SDT) may harm wounds. To minimize the waste energy and promote wound self-closure rate, a strong adhesive, and rapid thermal-responsive contraction (52.4%, 4 min), injectable hydrogel was designed to load CO-PMOF. The resulting ultrasonic triple-responsive hydrogel (UTGel) exhibits an effective biofilm destruction capability based on a CO/ROS-mediated antimicrobial therapy. After administration in an infected diabetic skin wound model in mice, UTGel can efficiently harvest the thermal energy by the CO-PMOF under US to trigger a centripetal shrinkage of the hydrogel and guide rapid wound self-closure.
研究领域:
生物医学工程
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药剂学
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组织工程
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产品关联
DOI
高影响因子
Nano Today
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2024
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IF 13.2
Xingyou Wang,Xiaoqing Sun,Jiahui Lei,Linsen Li,Nanhang Zhu,Yue Yu,Yating Zeng,Ke Kang,QiangYing Yi,Yao Wu
Bacterial infected wounds pose a significant threat to patient survival, necessitating prompt and effective therapeutic intervention. Biomaterials that are responsive to wound microenvironments, possess well-defined structures and are facile to fabricate are favored for fulfilling their mission of efficient wound repair. Drawing inspiration from the immunoregulatory properties of natural zwitterionic capsular polysaccharides (ZPS) and glucomannan (GM) as well as the biogenesis of nitric oxide (NO), this study introduces the zwitterionic lysine glycopolymers (ZLGs), which harmoniously integrate the antibacterial, anti-fouling and immunoregulatory functions into one entity, to effectively promote the healing of infected wounds without addition of any external cytokines or molecular drugs. The ZLGs, exhibiting excellent cytocompatibility, restore sustained NO biogenesis (∼7.1 μM) in wound environment and thus to clean bacteria fast and effectively (12 h clearance rate for S. aureus : 97 %; E. coli : 92 %). Notably, the cell-membrane affinitive ZLGs induce efficient aggregation of mannose receptors and polarize the macrophages to M2 phenotype via the PI3K-Akt/STAT3 pathway, resulting in a synergistic enhanced polarization efficiency increasement of 105 %, as compare to the cumulation of individual building modules. The bioinspired ZLGs accelerate the repair of S. aureus infected wounds in vivo, highlighting the significance of this multi-in-one construction strategy for chronic wound treatment.
研究领域:
生物材料学
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医学
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免疫学
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产品关联
DOI
高影响因子
International Journal of Green Energy
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2024
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IF 3.1
Inam Ullah Khan
Biodiesel predominantly originates from edible oil. Exploring non-edible oil resources is crucial to biodiesel manufacturing’s commercial viability and food security. This study examines four non-edible seed oils Hevea brasiliensis, Madhuca longifolia, Azadirachta indica, and Gossypium hirsutum as biofuel feedstocks. This study optimized reaction parameters to improve base-catalyzed transesterification, oil extraction and biodiesel synthesis. The produced esters were identified by nuclear magnetic resonance, Fourier transform infrared, and gas chromatography mass spectrometry. Elements composition was determined using inductively coupled plasma-optical emission spectrometry and elemental analyzer. The biofuel’s physicochemical properties met American Society for Testing and Materials and European standards. The maximum amount of crude oil was seen in Hevea brasiliensis using the soxhlet extraction process, ranging from 52-63%. This was followed by Madhuca longifolia 38-55%, Azadirachta indica 24-33%, and Gossypium hirsutum with 19-27%. The density of the plant sources exhibited a range of 0.88-0.90 g/cm3 @ 15 °C, while the kinematic viscosity showed a range of 3.2-4.1 mm2/s. The elemental composition of biodiesel, expressed as percentages of carbon, hydrogen, nitrogen, and oxygen, varied between the ranges of 70.52-76.30, 11.25-14.02, 1.18-2.75, and 9.11-13%, respectively. Since they may be grown in infertile and unproductive settings, these non-consumable seeds are cost-effective for renewable energy. They also help solve the energy situation by boosting biodiesel production..
研究领域:
能源植物学
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可再生能源工程
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
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IF 6.3
Zhen Huang,Shimin Geng,Yizhen Chen,Ying Li,Mingen Fei,Renhui Qiu,Tingting Chen,Wendi Liu
Traditional polyurethane hot-melt adhesives often fall short in achieving high bonding strength and recyclability, and their dependence on non-renewable resources poses a significant hurdle for sustainable development. In this study, a palm oil-based diethanolamide (POEA) containing a long aliphatic chain was synthesized to develop comb thermoplastic polyurethane hot-melt adhesives (POPUs) with high biobased content, superior adhesion strength, and reusability. The microphase separation structure of POPUs was manipulated through the incorporation of dangling fatty acid chains and hydrogen bonds, resulting in the adhesives with excellent mechanical properties, with an optimum tensile strength of 5.37 MPa and an elongation at break of 282 %. As a hot-melt adhesive, it achieved a maximum lap-shear strength of 7.34 MPa on steel and maintained an average strength of 95 % of its initial value across multiple bonding cycles. Moreover, its lap-shear strengths with wood and glass remained at 6.57 MPa and 3.57 MPa respectively, fully meeting the requirements for interior decoration. Additionally, it was unexpectedly discovered that the adhesives possessed fluorescence characteristics, which can be applied in fields such as cultural relic restoration and anti-counterfeiting.
研究领域:
材料科学
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可持续化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Zhimin Kou,Ye Sha,Meiting Liu,Guixin Zhang,Jie Wang,Meng Zhang,Lihong Hu,Puyou Jia,Yonghong Zhou
The intelligent design and green manufacturing of bio-based adhesives still face severe challenges. In this study, an epoxy adhesive based on β-hydroxyester bonds and multiple hydrogen bonds was prepared using tung oil and lignin. Molecular dynamics simulation was used to regulate the structure and properties of adhesives. The adhesive with a large number of aromatic ring structures and phenolic hydroxyl groups enhanced cohesion and surface adsorption through π–π stacking and hydrogen bonding. Conjugated double bonds and the flexible long chain of tung oil in the structural skeleton of adhesives provided modification sites and endowed the materials with good ductility. The adhesive materials showed remarkable mechanical properties, recyclability, and an adhesive strength of approximately 6 MPa, enabling their effective use in various harsh environments, with a decrease in shear strength of only about 10%. Two adhesive models, one with β-hydroxyester bonds and multiple hydrogen bonds and the other without these structures, were established for comparison. The adhesion energy on the wood surface was calculated to assess the impact of each structural component in the system. In this study, a strategy to analyze the interplay between the microstructure and properties of adhesives was presented, and a potential route for the intelligent design and manufacturing of high-performance bio-based adhesives was provided.
研究领域:
材料科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）