JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC
·
2016
·
IF 2.189
Xiqian Sheng,Ming Yan,Lin Xu,Miao Wei
We identified and characterized YqiG, a novel Old Yellow Enzyme (OYE) from Bacillus subtilis str.168 , as a member of the “thermophilic-like” subfamily. It is most related to XenA from Pseudomonas putida , with 37.9% identity, but it exhibits certain differences in sequence and enzyme properties. The YqiG can reduce various activated alkenes and exhibits high temperature (60 °C for 12 h) and pH stability (pH 4.0 and 9.0 for 12 h), which indicates that it has a great potential for biocatalysis. However, it shows low tolerance toward organic solvents. Also the YqiG shows high activities towards maleimide, dimethyl maleate and acyclic ketones (55.5 U/mg, 6.22 U/mg and 2.97 U/mg, respectively). Besides, The YqiG can catalyze citral to (S)-citronellal with a low rate but high ee% (>99%).
研究领域:
生物化学
·
酶学
·
微生物学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 18
·10081-10088
·
IF 2.936
Xiaofeng Li,Haixia Xu,Guanglei Zhao,Hui Wu,Yigang Yu,Furao Lai,Xinglong Xiao
Acylation modification of phenol glycosides is currently of great interest due to the improved bioavailability and multiple functions. In this work, mono- or diesters of arbutin, an important phenol glycoside derivative, can be controllably synthesized by using whole-cell biocatalytic systems. Among fourteen microbial strains selected, Candida parapsilosis cells showed the best catalytic activity and high organic solvent tolerance. Compared with the best pure solvent tetrahydrofuran, the use of a binary solvent pyridine-isooctane gave a slightly lower conversion (98.3% vs. 97.2%) and selectivity (85.3% vs. 80.5%) and much higher substrate solubility (37.1 vs. 214.0 mg mL−1), in a 24 h bioconversion of arbutin with a VP-arbutin molar ratio of 15 and whole cell dosage of 30 mg mL−1. The production of various arbutin esters with different fatty acid chain lengths can be realized by using this whole-cell strategy, with the substrate conversion and 6′-regioselectivity of 54.1–98.3% and 83.2–99.0%, respectively.
研究领域:
生物化学
·
药物化学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Xueting Zhao,Qingqing Qiu,Jinshan Sun,Xinhao Cheng,Lifen Liu,Jiefeng Pan
Nanofiltration (NF) membrane technology serves as an efficient method for separation and purification, playing a vital role in various industrial fields such as water treatment, food processing, and pharmaceutical manufacturing. However, there are still drawbacks, such as limited flux due to densely crosslinked composite layer and poor stability in solvents. In this study, we report the fabrication of the thin-film composite (TFC) NF membrane using Tröger’s base-derived building block, aiming to manipulate intrinsic pore structures of the as-synthesized ultra-thin composite layer by introducing rigid dihedral units. The interfacial polymerization process is employed to enable the polycondensation of Tröger’s base-based diamine monomer and tri-aldehyde monomer via Schiff base reaction. The effects of monomer concentration, immersion time, interfacial polymerization reaction time, heat treatment time and temperature on the performance of NF membrane were studied. The optimized NF membrane presents a rejection of Methyl blue (MB) above 95.3 % and achieves a high water permeance of 43.4 L·m −2 ·h −1 ·bar −1 . The water permeance is 2–3 times higher than the reported NF membranes with similar rejection ability. In addition, Tröger’s base-derived TFC NF membrane exhibits excellent long-term stability and good organic solvent tolerance. Considering the high water permeance and separation efficiency, the present membrane has significance in dye removal and separation processes.
研究领域:
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 MEMBRANE SCIENCE
·
2023
·
IF 9.5
Fan Yang,Su Li,Hongyan Qi,Weibo Sun,Jinbao Li,Mei Zhang,Zheng Chen,Jinhui Pang,Zhenhua Jiang
Although poly (ether ether ketone) (PEEK) exhibits excellent solvent resistance , it could not be prepared directly by non-solvent induced phase separation (NIPS) method due to its poor solubility. Herein, PEEK porous membranes were successfully fabricated by combining NIPS and acid hydrolysis. The superhydrophilic thermo-responsive poly (N-isopropylacrylamide) (PNIPAm) polymer was in-situ grafted on the PEEK membrane surface via the UV grafting polymerization and improved the membrane interface hydrophilicity, making the membrane water contact angle changed from 89.5° to 0° at 25 °C. After heating the membrane surface to 40 °C, the membrane exhibited hydrophobicity (100°), realizing the thermo-responsiveness via switching the temperature. Furthermore, due to the transferred membrane wettability at different temperatures, PEEK-g-PNIPAm could separate different types of oil-bearing systems with high rejection above 99.0 %. What’s more, the PNIPAm layer also enhanced the membrane anti-fouling capacity. Benefiting from the extraordinary solvent resistance of the PEEK matrix, PEEK-g-PNIPAm maintains its intact morphology after 6 h immersion in various organic solvents , addressing the commonly reported problem of polymer membranes having certain solubility in solvents. The PEEK-based membranes with excellent solvent resistance could be useful in the oil-bearing separation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Fan Luo,Jiaqi Zhang,Zhenggong Wang,Jian Jin
Organic solvent nanofiltration (OSN) membranes with ideal flux and rejection rates, as well as a wide range of solvent resistance and good stability are highly required in daily chemical production. Chemical cross-linking strategies can improve the stability of polymer membranes for stable separation properties in a wide range of organic solvents, and they also play a crucial role in the aging and compaction resistance of membranes. However, the chemical cross-linker occupies free volume in the molecular chain, resulting a decrease in permeance. And they also break down the structure of the polymer backbone, affecting the membrane’s mechanical properties. This work proposes a metal organic framework (ZIF-8) based cross-linker to enhance the organic resistance of polymer membrane with largely improved permeance. Typically, nano-sized ZIF-8 particle were dispersed into a carboxyl-functionalized polyimide (C-PI). The obtained polymer membrane was in situ crosslinked by forming coordination bond between –COOH group of C-PI and Zn 2+ on the surface of ZIF-8. ZIF-8 crosslinked polymer membrane remained stable in a wide range of organic solvents including acetone, methanol, acetonitrile, dimethylformamide, etc. The methanol permeance of the crosslinked membrane is largely enhanced by 428 %. The optimized ZIF-8 crosslinked membrane showed a methanol permeance of 20.8 L m -2 h −1 bar −1 and a rejection rate of 91.3 % for Congo Red. The present study confirms the feasibility and advantage of framework-based material as a cross-linker to obtain OSN membranes with robust chemical stability and excellent separation performance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Shengping Dai,Jingping Yao,Longhua Zeng,Jinlong Shuai,Yan Zhong,Hongmei Chen,Cheng Liu,Wentong Chen,Yan Sui
High bonding strength and adhesion stability performance adhesives are essential for many fields, including electronic packaging, and interface bonding, etc. However, ultra-high and stable adhesion imposes higher requirements on the structure and properties of soft adhesives. Herein, A ultra-high adhesion, adhesion stability performance soft adhesive was developed by soft polyurethane foam. PuFA x (polyurethane foam adhesive) demonstrated outstanding flexibility (maximum compressive strength of 62.86 kPa), and ultra-high adhesion strength (up to 81.42 MPa for Cu). The gas generated by the physical foaming of PuFA x serves as an internal driving force, facilitating the formation of a mechanical interlocking structure between the polyurethane chains and the substrates. Thus, it forms a synergistic effect with chemical coupling, further enhancing the bonding strength. In terms of environmental adaptability, PuFA x exhibited excellent solvent-resistant adhesion stability performance under harsh conditions, including exposure to solvents such as DMSO, CH 2 Cl 2 , C 2 H 5 OH, HCl, NaOH, NaCl, and H 2 O. Furthermore, PuFA x demonstrated outstanding stable adhesion properties even in high-temperature aqueous solutions with a temperature as high as 100 °C and throughout a prolonged aging process that can extend up to 12 months. The design strategy of PuFA x provided a new way to develop an outstanding soft adhesive candidate with ultra-high and stable adhesion.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Jing Gao,Yun Wang,Yingjie Du,Liya Zhou,Ying He,Li Ma,Luyan Yin,Weixi Kong,Yanjun Jiang
The synthesis of silica-based colloidosome with a magnetic solid core via Pickering emulsification and its use as an immobilized enzyme system is described in this work. Lipase B from Candida antarctica (CALB) was physically adsorbed on the material to form the immobilized enzyme (LP@colloidosome) and the enzyme loading was 166.3 mg/g support . The specific hydrolytic activity of LP@colloidosome was 209.6 U/g support and its immobilization yield was 22.08%. The stability test indicated that LP@colloidosome can retain 49% of original activity after incubation at 50 °C for 6 h and 105.6% of original activity after incubation in t -butanol for 96 h, while the free lipase lost most the initial activity under the same condition. These findings showed that LP@colloidosome had the enhanced thermal stability and tolerance in organic solvents. Meanwhile, LP@colloidosome can be easily recovered by magnet due to the addition of modified Fe 3 O 4 nanoparticles in the solid core. LP@colloidosome was successfully used to catalyze the esterification of fatty acids and alcohols with different length in organic solvent. The yields of the corresponding esters that catalyzed by LP@colloidosome were significantly higher than those catalyzed by free lipase. Additionally, the versatility of LP@colloidosome was also verified in the synthesis of glycerol carbonate through transesterification. The results indicated that biosynthesis of glycerol carbonate from glycerol using the LP@colloidosome (6.1 wt%) as catalyst afforded 85.20% of conversion rate at 60 °C. This work offers insight into the design of colloidosome for efficient immobilization of lipase as well as improvement of the lipase’s properties.
研究领域:
生物化学
·
材料科学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Huixin Lu,Xiaotian Wang,Tao Deng,Xi Du,Zhenhuan Li,Maliang Zhang
To meet the separation requirements of polyphenylene sulfide (PPS) membranes in extremely harsh environments and to enhance the separation performance of PPS membrane material, this study utilizes Zeolitic imidazolate framework (ZIF) material with a porous structure to modify the structure of the PPS membranes. Using the Contra-diffusion synthesis method, we successfully created PPS composite membranes that were modified by ZIF-8. At the end of the three-hour reaction time, a continuous and dense layer of ZIF-8 crystals with uniform crystal size and regular crystal shape was produced on the matrix membrane's surface. The permeance to rhodamine B aqueous solution is 42.54 L m −2 h −1 bar −1 , and the retention rate is 99.5 %, which has high permeability and retention performance. In the anti-pollution performance test, the composite membrane's flux recovery rate is 72.9 %, which has good anti-pollution performance. After immersion in strong acids, strong alkalis, and a variety of organic solvents, the appearance shows no evident flaws, and the separation performance in strong alkalis and five different types of organic solvents stays steady, demonstrating excellent alkali and solvent resistance. This proves that composite membranes have great potential for application in dye wastewater treatment.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 24
·52332
·
IF 3.057
Xibin Wu,Zhimei Wei,Jie Yang,Gang Zhang,Shengru Long,Xiaojun Wang
The purification of dye wastewater plays a critical role in water pollution treatment. Adsorption is a cheap and effective separation technology but is limited by the reuse of adsorption materials. Ultrafiltration membranes have a relatively high flux but their pores are too large to reject small dye molecules. In this study, negatively charged oxidized poly (arylene sulfide sulfone) (O-PASS) membrane, NMP pretreatment oxidized O-PASS (N-O-PASS) membrane, and O-PASS@UiO-66-NH 2 /O-PASS composite membranes were fabricated to retain cationic methylene blue (MB) from wastewater by combining ultrafiltration and adsorption techniques. The increased porosity of the N-O-PASS membrane provides more available adsorption sites for an equilibrium MB adsorption amount of 22.5 (mg g −1 ) and 100% rejection in the first 10 min during ultrafiltration with a pure water flux of 162.32 (L m −2 h −1 bar −1 ). Due to the enhanced hydrophilicity and separating property by deposited UiO-66-NH 2 particles and PASS resin, O-PASS@UiO-66-NH 2 /O-PASS composite membrane shows a flux of 170.32 (L m −2 h −1 bar −1 ) and a 100% MB rejection in 60 min with great reusability. The O-PASS@UiO-66-NH 2 /O-PASS composite membrane is a new promising membrane for the removal of dyes from wastewater. Meanwhile, the superior solvent resistance endows it great adaptability in wide applications, especially in harsh conditions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2021
·
IF 6.064
Xiaoyun Li,Zhen Wang,Xin Jing,Xudong Li,Junwei Wang,Maoqing Kang,Yuhua Zhao,Qifeng Li
Hydrogen bonds, which can be divided into many types along with the deepening of research, exist in many compounds and have certain impact on properties of substances. In this work, effect of intramolecular hydrogen bond on solvent resistance of polymeric membranes was studied from two aspects. On the one hand, the existence of intramolecular hydrogen bond on solvent resistance of polymeric membranes was studied by constructing and shielding special hydroxyl groups in typical polymer polyurethane. On the other hand, content of intramolecular hydrogen bond on solvent resistance was investigated by building different ratios of inter- and intra-molecular hydrogen bonds in polyvinyl alcohols. The structures, solvent resistance and hydrogen bonding interactions were systematically investigated by FT-IR, XRD, Ds and performances before and after immersed in solvents. Permeabilities of the membranes for practical application were also characterized. The results showed that distinct type and ratio of hydrogen bonds played different role on solvent resistance. A good agreement between the swelling performances and content of intramolecular hydrogen bond proved the positive effect of intramolecular hydrogen bond on solvent durability of polymeric membranes. In addition, polyurethane membranes exhibited good impermeability to water vapor, oxygen and chloride ions which showed potential application in many fields.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Pengxin Shen,Junbin Liao,Quan Chen,Huimin Ruan,Jiangnan Shen
The development of organic solvent resistant ion exchange membranes (IEMs) with high ion conductivity is of significance for broader electrodialysis (ED) applications. In this work, a series of organic solvent resistant cation exchange membranes (CEMs) has been fabricated by splitting Kevlar fabrics into small and short nanofibers , followed by modifying with 4-amino-benzenesulfonic acid monosodium salt (ABS) and poly(4-styrenesulfonic acid- co -maleic acid) sodium salt (PSSMA) eater via amide condensation. By tuning the content of ABS, the as-prepared poly- p -phenylene terephthalamide sulfonated polymer (PAP) CEMs (PAP-CEMs) show high ion exchange capacities (up to 2.23 mmol⋅g −1 ), good electrochemical performance and desired capacity of cation/anion separation in ED. To evaluate the organic solvent resistance of as-prepared CEMs, PAP-CEMs were immersed in ethanol and acetone aqueous solutions for 48 h at room temperature, respectively. The investigation demonstrates that ED with the treated CEM (the optimized PAP-0.50 CEM) still exhibits high desalination efficiencies (81.2%, in 60% (V ethanol /V water ) ethanol solution; 82.3%, in 60% (V acetone /V water ) acetone solution) and concentration efficiencies (57.4%, in 60% ethanol solution; 50.9%, in 60% acetone solution). As a result, it is believed that the study here highlights a design of simple route for the preparation of CEMs, which can be potentially applied in ED for organic solvent solution systems.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 10
·2106
·
IF 4.6
Zhaoyang Zhang,Shengkui Ma,Jianfeng Gao
Hydrogen-bonded cross-linked main chain azobenzene (azo) photoactive polymers have broad application prospects in flexible actuators, optical actuators, and other fields. Most of the research on this kind of photoresponsive material is mainly focused on air, and exploration in solvents remains underexplored. In this paper, azobenzene polyamide ester semicrystalline polymer (PEA-6T) with hydrogen-bond cross-linking was synthesized by Michael addition polymerization. The uniaxially oriented polymer film with high orientation (48.85%) and fast response (5 s under UV light and 55 s under visible light) was obtained by a simple solution casting/mechanical stretching method. Compared with PEA-2T and PEA-4T, PEA-6T exhibits enhanced mechanical properties (elastic modulus increased by 17.4%; yield strength increased by 34.1%; breaking strength increased by 75.4%; elongation at break increased by 33.8%; toughness increased by 101.3%; photoinduced stress increased by 43.5%) and reduced light response time (decreased by 58.3% in ultraviolet light and 50% in visible light) due to the elongation of the compliant chain length. The thin PEA-6T film exhibited light-induced deformation not only in air but also in polar solvents such as water, methanol, ethanol, butanol, and saline solutions (e.g., normal saline, 0.9 wt% NaCl, and simulated seawater, 3.5 wt% NaCl). In addition, polarizing optical microscope (POM) observations showed that the brightness and texture direction of the films remained stable (ΔBrightness< 5%), the light response time was consistent (6 s under UV light, 65 s under visible light), the light-induced stress retention rate was 95%, and the films exhibited good solvent resistance. This study bridges the research gap in azobenzene photoresponsive materials in solvent environments, and the material shows potential for applications in marine equipment coatings or biomedical actuators.
研究领域:
材料科学
·
光化学
·
生物医学工程
✓ 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）