MACROMOLECULAR RAPID COMMUNICATIONS
·
2013
·Vol. 35
·期 5
·566-573
·
IF 4.929
Xuepeng Zhang,Minxin Cui,Rui Zhou,Changle Chen,Guoqing Zhang
Primary alcohol-functionalized β-diketones (bdks) are successfully synthesized via facile one-step Claisen condensation between aromatic monoketones and ε -caprolactone ( ε -CL). To demonstrate application potentials, these bdk alcohols are used to chelate with various Lewis acids, including Tb (III), Eu (III), and B (III). It is discovered that the resulting Tb (III) and Eu (III) diketonate complexes can serve as both catalysts and initiators for ring-opening polymerization (ROP) under solvent-free conditions, using lactide monomer as an example. The polylactides (PLAs) thus obtained exhibit luminescence properties characteristic of Tb (III) and Eu (III), respectively. On the other hand, boron-chelated diketone can initiate ROP of lactide in the presence of Sn(oct) 2 , and affords a PLA material with dual-emission, i.e., fluorescence and room temperature phosphorescence. The synthesis described here represents a shortcut for the preparation of bdk-based macroligands and subsequent functional materials.
研究领域:
有机化学
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材料科学
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Haijun Xu,Shenmei Sun,Jiangxiong Wei,Qijun Yu,Qiang Shao,Chun Lin
A novel monovinyl β-cyclodextrin monomer (MA-β-CD; MA = methacrylate) was employed to synthesize polycarboxylate superplasticizers modified with β-CD as pendant groups, and their dispersing performance was tested in the absence and presence of montmorillonite. Adsorption measurement and X-ray diffraciton analysis indicated that their interactions with Ca-montmorillonite originated from electrostatic attractions between carboxylate groups and the positive charge of Ca-montmorillonite particle. Compared with conventional polycarboxylate superplasticizers (PCEs) only with poly(ethylene oxide) (PEO) chains, polycarboxylate superplasticizers with β-CD as pendants displayed enhanced robustness toward clay. This was attributed to the steric hindrance instigated from β-CD groups with the structure of a hollow truncated cone by hindering the sorption of polycarboxylate polymers on the surfaces of Ca-montmorillonite.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2015
·Vol. 22
·期 13
·10107-10115
·
IF 2.828
Wang Guanghui,Wang Yin,Hu Suhang,Deng Nansheng,Wu Feng
It is necessary to find an effective soil remediation technology for the simultaneous removal of hydrophobic organic contaminants and heavy metals from contaminated soils. In this work, a novel cysteine-β-cyclodextrin (CCD) was synthesized by the reaction of β-cyclodextrin with cysteine, and the structure of CCD was confirmed by 1 H-NMR, 13 C-NMR, FT-IR spectroscopy and elemental analysis. Pot-culture experiments were conducted to investigate the effects of CCD on the phytoremediation of soil co-contaminated with phenanthrene and lead. The results showed that CCD can enhance the phytoremediation of soil co-contaminated with phenanthrene and lead. When CCD was added to the co-contaminated soil, the concentrations of phenanthrene and Pb in roots and shoots of ryegrass ( Lolium perenne L . ) significantly increased, the presence of CCD is beneficial to the accumulation of phenanthrene and Pb in ryegrass, and the residual concentrations of phenanthrene and Pb in soils significantly decreased. Under the co-contamination of 500 mg Pb kg −1 and 50 mg PHE kg −1 , the bioconcentration factor of phenanthrene and Pb in the presence of CCD was increased by 1.43-fold and 4.47-fold, respectively. After CCD was added to the contaminated soils, the residual concentration of phenanthrene and Pb in unplanted soil was decreased by 18 and 25 %, respectively. However, for the planted soil, the residual concentration of phenanthrene and Pb was decreased by 48 and 56 %, respectively. CCD may improve the bioavailability of phenanthrene and Pb in co-contaminated soil; CCD enhanced phytoremediation technology may be a good alternative for the removal of hydrophobic organic contaminants and heavy metals from contaminated soils.
研究领域:
环境科学
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土壤修复
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DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Wu Peiling,Chen Haofeng,Chen Yueyang,Zhang Yang,Yuan Jifeng
Microbial synthesis of chemicals using renewable feedstocks has gained interest due to its sustainability. The class of β,γ-diols has unique chemical and physical properties, making them valuable for diverse applications. Here, we report a biosynthetic platform in Escherichia coli for the synthesis of branched-chain β,γ-diols from renewable feedstocks. Firstly, we identify an acetohydroxyacid synthase from Saccharomyces cerevisiae to catalyze the condensation of branched-chain aldehydes with pyruvate, forming α-hydroxyketones. Next, de novo production of branched-chain β,γ-diols (4-methylpentane-2,3-diol, 5-methylhexane-2,3-diol and 4-methylhexane-2,3-diol) is realized from branched-chain amino acids (BCAA) metabolism. After systematic optimization of the BCAA pathway, we have achieved high-specificity production of 4-methylpentane-2,3-diol from glucose, achieving 129.8 mM (15.3 g/L) 4-methylpentane-2,3-diol with 72% of the theoretical yield. In summary, our work demonstrates the synthesis of structurally diverse branched-chain β,γ-diols, highlighting its potential as a versatile carbon elongation system for other β,γ-diol productions.
研究领域:
生物化学
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代谢工程
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合成生物学
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DOI
PubMed
高影响因子
Journal of Environmental Sciences
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2012
·
IF 1.66
Baoxiu Zhao,Mou Lv,Li Zhou
Perfluorooctanoic acid (PFOA) is a new-found hazardous persistent organic pollutant, and it is resistant to decomposition by hydroxyl radical (HO) due to its stable chemical structure and the high electronegativity of fluorine. Photocatalytic reduction of PFOA with β-Ga 2 O 3 in anoxic aqueous solution was investigated for the first time, and the results showed that the photoinduced electron (e − cb ) coming from the β-Ga 2 O 3 conduction band was the major degradation substance for PFOA, and shorter-chain perfluorinated carboxylic acids (PFCAs, C n F 2n+1 COOH, 1 ≤ n ≤ 6) were the dominant products. Furthermore, the concentration of F − was measured by the IC technique and defluorination efficiency was calculated. After 3 hr, the photocatalytic degradation efficiency was 98.8% and defluorination efficiency was 31.6% in the presence of thiosulfate and bubbling N 2 . The degradation reaction followed first-order kinetics ( k = 0.0239 min −1 , t 1/2 = 0.48 hr). PFCAs (C n F 2n+1 COOH, 1 ≤ n ≤ 7) were detected and measured by LC-MS and LC-MS/MS methods. It was deduced that the probable photocatalytic degradation mechanism involves e − cb attacking the carboxyl of C n F 2n + 1 COOH, resulting in decarboxylation and the generation of C n F 2n + 1 . The produced C n F 2n + 1 reacted with H 2 O, forming C n F 2n + 1 OH, then C n F 2n + 1 OH underwent HF loss and hydrolysis to form C n F 2n+1 COOH.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 3.8
Jiayan Du,Youtong Bao,Jingyuan Zhu,Xueqing Pang,Depeng Ren,Xinjian Yin,Pingping Zhou
Astaxanthin, a potent antioxidant widely applied in health supplements, cosmetics, and animal feed, faces production challenges in microbial synthesis due to inefficient β-carotene hydroxylase activity. This study identified rate-limiting enzymes and demonstrated that the expressing phytoene desaturase BtCrtI from Blakeslea trispora in Saccharomyces cerevisiae increased β-carotene production 2.8-fold compared to XdCrtI from Xanthophyllomyces dendrorhous . Integrating of XdCrtYB, BtCrtI, CrtE03M, and tHMG1 achieved 208.7 mg/L β-carotene. However, introducing β-carotene ketolase and β-carotene hydroxylase into this strain unexpectedly increased lycopene accumulation, likely due to feedback inhibition by the product and enzyme imbalance. To address this, we utilized a moderate β-carotene producer YJYast-02 for astaxanthin production. Truncating the N-terminal 39 amino acids of β-carotene hydroxylase from Haematococcus pluvialis improved astaxanthin titer by 37.7 %. Rational engineering of the hydrophobicity of the substrate-binding pocket in β-carotene hydroxylase, specifically through mutations such as N183A, C191A and T213A, further increased astaxanthin titer by 15.8 %, 30.5 %, 36.8 %, respectively. The final engineered strain, YJYast-03(t5t39 T213A ), expressing t5OBKTM30 and t39OcrtZM1 T213A , achieved 26.0 mg/L (3.6 mg/g DCW) astaxanthin. This work pioneers the use of molecular docking for engineering β-carotene hydroxylase, offering potential to significantly enhance catalytic activity and optimize astaxanthin biosynthesis in yeast.
研究领域:
生物工程
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合成生物学
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微生物学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Ling-Zhi Huang,Yan Ding,Dan-Dan Li,Ming-Guo Ma
Cellulosic triboelectric materials have gained widespread attention in triboelectric nanogenerators (TENGs) recently due to their fascinating merits of renewability, biodegradability, and low cost. However, cellulose-based TENGs still are challenged by the low surface charge density of triboelectric materials. Herein, the negative charged cellulosic triboelectric materials are functionalized as triboelectric layers for self-powered sensors via an electrostatic spinning method, where the electrospun polyvinylidene fluoride (PVDF) nanofibers fill with the porous air-laid paper (AP), boosting the formation of polar β-phase crystals and a negative shift of the surface potential. The TENG constructed with PVDF/12 wt%@AP affords charge output of 60.7 μC m −2 and power output of 233.28 mW m −2 , and the as-prepared contact self-sensor presents unparalleled sensitivity of 6.20 V kPa −1 under pressures from 1.23 kPa to 5.0 kPa. In addition, we design the non-contact self-powered sensor, capable of recognizing different objects and accurately detecting human movements like walking, running, and jumping. Notably, the TENGs can also be used as a wireless sensor terminal for smart devices to provide convenient sensing functions. This β-phase cellulosic materials are a step toward wearable self-powered sensor systems that are durable to capture mechanical energy from the environment.
研究领域:
材料科学
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生物医学工程
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Jing Xue,Zhiwei Jiao,Ran Bi,Runnan Zhang,Xinda You,Fei Wang,Linjie Zhou,Yanlei Su,Zhongyi Jiang
The chlorine resistance is recognized as one of the crucial and essential properties of membranes in water treatment field. In this study, β-cyclodextrin (β-CD) with abundant hydrophilic hydroxyl groups as aqueous phase monomer and trimesoyl chloride (TMC) as organic phase monomer were utilized to fabricate the polyester thin film composite (TFC) nanofiltration (NF) membranes by interfacial polymerization (IP) method. The optimized β-CD polyester TFC membrane with 1.8 wt% β-CDs in aqueous phase was immersed in harsh chlorine environment (10000 ppm NaClO aqueous solution) up to 96 h and exhibited the steady water flux and dye rejection, manifesting the outstanding chlorine-resistant performance of β-CD polyester TFC membranes. The sodium hypochlorite cleaning experiments showed that NaClO was effective to remove the deposited and adsorbed foulants onto the β-CD polyester TFC membranes. Therefore, the superior chlorine resistance of β-CD polyester TFC nanofiltration membranes would find promising potential applications in water treatment processes.
研究领域:
材料科学
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水处理工程
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
·
2015
·Vol. 92
·期 4
·495-502
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IF 1.541
Fu Xiao-bo,Chen Jie,Song Xue-li,Zhang Yuan-ming,Zhu Yi,Yang Jun,Zhang Cheng-wu
A novel carbon solid acid catalyst was prepared by incomplete hydrothermal carbonization of β-cyclodextrin into small polycyclic aromatic carbon sheets, followed by the introduction of –SO 3 H groups via sulfonation with sulfuric acid. The physical and chemical properties of the catalyst were characterized in detail. The catalyst simultaneously catalyzed esterification and transesterification reactions to produce biodiesel from high free fatty acid (FFA) containing oils (55.2 %). For the as-prepared catalyst, 90.82 % of the oleic acid was esterified after 8 h, while the total transesterification yield of high FFA containing oils reached 79.98 % after 12 h. By contrast, the obtained catalyst showed comparable activity to biomass (such as sugar, starch, etc.)-based carbon solid acid catalyst while Amberlyst-15 resulted in significantly lower levels of conversion, demonstrating its relatively high catalytic activity for simultaneous esterification and transesterification. Moreover, as the catalyst can be regenerated, it has the potential for use in biodiesel production from oils with a high FFA content.
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Ruihan Xiong,Caixiang Zhang,Hanxiang Xiong,Shuxin Huang,Jiasen Li
Glyphosate as an effective broad-spectrum herbicide is frequently detected in various water and soil resources. Given the ubiquity of β-MnO 2 and δ-MnO 2 colloids in groundwater and soil, the abiotic removal of glyphosate by MnO 2 colloids was investigated. β-MnO 2 colloids exhibited superior glyphosate removal efficiency, up to 37%, compared to 21% for δ-MnO 2 colloids at a pH of 4.0. Glyphosate removal involved simultaneous adsorption and oxidation process , identified by HRTEM , NH 3 -TPD, XPS , LC-MS, FTIR analyses and the occurrence of aminomethylphosphonic acid (AMPA) and Mn 2+ . Moreover, adsorption dominated the removal of glyphosate by two MnO 2 colloids. The solution pH had a substantial effect on glyphosate removal. Co-existing ions in the solution, such as carbonate (CO 3 2− ), phosphate (Na 2 HPO 4 , NaH 2 PO 4 ) and humic acid (HA), were also found to impede glyphosate removal. Phosphate, in particular, exhibited a strong competitive effect for adsorption sites on both MnO 2 colloids. Of them, the removal of glyphosate by β-MnO 2 colloids was more prone to occur due to its higher specific surface area , abundant oxygen vacancies , and moderate acid sites. However, δ-MnO 2 colloids presented a stronger oxidation capacity than that of β-MnO 2 colloids due to the quicker generation rate of Mn 2+ . Finally, AMPA was the same products by two MnO 2 colloids in the oxidation process, revealing the degradation pathway based on the cleavage of C–N bond. Therefore, by comparing kinetics and mechanisms of glyphosate removal by β- and δ-MnO 2 colloids, this study improves us better understanding for the behavior of glyphosate in the environment.
研究领域:
环境科学
·
化学
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Xiufang He,Zhansheng Wu,Zhonghai Sun,Xinhui Wei,Zhilin Wu,Xinyu Ge,Giancarlo Cravotto
A novel hybrid material was prepared by grafting β-cyclodextrin (β-CD) onto the surface of oxidized AC for the rapid adsorption of naphthalene . AC and CDACs were characterized using the N 2 adsorption–desorption method, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and solid state CP MAS 13 C NMR. All the results demonstrate that β-CD grafted successfully onto AC. Batch experimental adsorption datas had a higher correlation to Freundlich isotherm model and the pseudo-second-order model. The adsorption equilibrium capacity of 178.73 mg·g −1 was reached in just 10 s at an AC/β-CD grafting ratio value of 1:1. It had a faster adsorption rate than many reported adsorbents. Additionally, the positive free energy change (∆G°), and the positive enthalpy change (∆H°) suggest that it is a viable, spontaneous and endothermic process, which will provided a new path to a highly-efficient and fast-adsorption-rate adsorbent for naphthalene or its analogues discharged into the environment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Lina Yang,Dehua Hu,Hailing Liu,Xiangfeng Wang,Yuan Liu,Qianshu Xia,Suimin Deng,Yun Hao,Yuhao Jin,Mengxia Xie
The pollution caused by the abuse of antibiotics has posed a serious threat to the ecological environment and human health, so development of effective strategies for degradation and disposal of antibiotic residues is urgently needed. In this work, penicillinase, a kind of β -lactamase, was immobilized into zeolitic imidazolate framework-8 (ZIF-8) by self-assembly method and the catalytic performance of the β [email protected] porous materials for degradation of penicillins has been investigated by high performance liquid chromatography coupled with mass spectrometry . The results illustrated that the catalytic activity of the encapsulated enzyme was significantly enhanced comparing with that of free enzyme. Meanwhile, the β [email protected] exhibited excellent stability under denaturing conditions including high temperature, organic solvent and the enzyme inhibitor . The catalytic degradation mechanism of the β [email protected] for penicillins has been probed and verified, and it has been found that the Zn (II) ion on ZIF-8 frameworks could form the complex with the target molecule, which weakened the bond of the four-membered β -lactam ring in the penicillin molecule, and thus enhanced the degradation efficiency of the enzyme. This work provided a promising strategy for eliminating the penicillin residues in water environment.
研究领域:
环境科学
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生物化学
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材料科学
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药学
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DOI
PubMed
高影响因子
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