INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
·
IF 5.162
Huifang Wang,Yisheng Zhang,Wenman Xue,Xinyu Zhang,Xiaoli Jia,Tianren Xue,Ruijie Guo,Baolong Niu,Hong Yan
In this contribution, a novel soluble and antibacterial polymer, O-xanthonyl-chitosan (CTMC-Xan), was synthesized successfully by grafting 1,3-dihydroxy-xanthone (Xan) to the side chains of O -carboxymethyl- N , N , N -trimethyl chitosan (CTMC). The chemical structure and physical properties of the polymer were analyzed by 1 H NMR, FT-IR spectra, UV spectra and XRD. The results showed that Xan could covalently bond with the carboxyl groups of CTMC by esterification at a grafting ratio of 9.1%. XRD patterns indicated that CTMC-Xan does not exhibit crystallization. The solubility tests showed that CTMC-Xan was completely dissolved and stable in neutral solution but unstable in acid or basic conditions. Moreover, it was found that the antibacterial activity against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) of CTMC-Xan was much stronger than that of Xan and CTMC, and the minimal bactericidal concentration (MBC) was 125 μg·mL −1 . Due to the enhanced solubility and antibacterial activity, CTMC-Xan could potentially serve as a desirable biomaterial for food and pharmaceutical applications .
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高影响因子
Polymer Chemistry
·
2017
·Vol. 8
·期 9
·1573-1578
·
IF 5.375
Ze Li,Chunyong Wu,Lifeng Liu,Meijiang Li,Xiongfa Yang,Chaowei Hao,Qiu Chen,Ziqiang Hu,Mengxian Luo,Guoqiao Lai,Tien-Yau Luh
Macrocyclic polysiloxanes are useful materials for the development of interpenetrating polymer networks and thermally stable materials. The main drawbacks of reported methods for the preparation of macrocyclic polysiloxanes are that mixtures of linear and cyclic polysiloxanes are commonly obtained, and complex and time-consuming separation processes are needed. Moreover, the preparation of macrocyclic polysiloxanes occasionally needs harsh conditions, and in general has low efficiency. In this research, we find that highly pure macrocyclic poly(methylvinylsiloxane)s (cPMVSs) can be chemoselectively prepared from 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane with water catalyzed by anhydrous iron(III) chloride in high efficiency. The structure of cPMVSs is characterized by gel permeation chromatography, infrared spectroscopy, 1H- and 29Si-nuclear magnetic resonance (NMR), and viscosity. Thermogravimetric analysis shows that cPMVSs have excellent thermal stability. A metathetical ring-expanding polymerization mechanism is proposed.
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RSC Advances
·
2014
·Vol. 5
·期 8
·5674-5679
·
IF 3.708
Gang Wang,Li Peng,Yaochen Zheng,Yanqin Gao,Xuedong Wu,Tianhui Ren,Chao Gao,Jin Han
We describe a novel triethylamine catalyzed S → O acetyl migration reaction for yielding thiol compounds under mild conditions through the formation of a transitional 5-membered ring. A series of epoxy compounds have been transformed into their thiol counterparts which could be used for construction of topological and functional sulfur-containing polymers. The one-pot two-step processes including the S → O acetyl migration and the following thiol-click reactions avoided separation of thiol intermediates. Applying these processes on a new-type latent polythiols overcomes crosslinking problem usually met in preparation of multithiol compounds due to the formation of disulfide bonds.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Hanguang Wang,Xiaoxue He,Shiyuan Tong,Xinyue Dai,Qiqi Wu,Jiayu Hu,Chao Dong,Jingjing Wang,Chengxin Lei,Juhua Feng,Wei Li,Li Zhang,Qianming Huang,Xiang Pu
Rhynchophylline (RIN) and isorhynchophylline (IRN) have been evaluated as the pivotal medicinal ingredients in Uncaria rhynchophylla. They display excellent antihypertensive and neuroprotective effects. But in U. rhynchophylla , the gene elements responsible for the biosynthesis of secologanin, a critical precursor for RIN and IRN, remain unidentified. In this study, one UrLAMT gene and three UrCYP72A genes ( UrCYP72A1177 , UrCYP72A1178 , and UrCYP72A1179 ) are mined and cloned from U. rhynchophylla . Biochemical verification reveals that UrLAMT exhibits C11-carboxy O -methyltransferase activity for loganic acid and UrCYP72A1177–UrCYP72A1179 display C7-C8 bond scission activity for loganin. Evolutionary origin analyses imply that the genes responsible for iridoid biosynthesis cluster in adjacent region in O. pumila and L. japonica , but UrLAMT and UrCYP72A1178 – UrCYP72A1179 distribute scatteredly in U. rhynchophylla . Kinetic parameter analyses reveal that UrCYP72A-catalyzed C7-C8 scission is a rate-limiting step. The enzymatic activities of UrCYP72A1177–UrCYP72A1179 are significantly improved by D396E, F327G + P393V, and L321G + V390I mutation, respectively. Two-step biosynthesis of secologanin is facilitated by co-expression of UrLAMT and UrCYP72As in tobacco. The highest secologanin yield (3.35 μg g −1 ) in tobacco is achieved in UrLAMT and UrCYP72A1177-D396E co-expression group. This study newly uncovers two adjacent biosynthetic steps for secologanin in a RIN-producing plant, proposes a plausible mechanism for UrCYP72A-mediated C C bond cleavage, and boosts the secologanin yield in tobacco. These findings would accelerate the schedule of RIN biomanufacture.
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PubMed
高影响因子
CARBON
·
2025
·
IF 11.6
Sabarinathan Ravichandran,Angappan Kausalya,Xinru Ji,Senthilkumar Lakshmipathi,Huaneng Su,Daifen Chen,Jie Yu
Defect engineering coupled with heteroatom-induced electronic modulation is crucial for developing highly active metal-free carbon electrocatalysts for anion exchange membrane fuel cells (AEMFCs). However, precisely identifying active configurations in dual-heteroatom-doped carbon and controlling the ORR pathway remains challenging. Herein, we present a lignin-based supermolecule-regulated pyrolysis strategy for synthesizing N, O co-doped porous carbon (LNOC) with a large surface area of 549.7 m 2 g −1 and a hierarchical porous structure. The optimized LNOC-900 catalyst demonstrates excellent ORR activity, featuring a half-wave potential (E 1/2 ) of 0.86 V vs. RHE and a high kinetic current density (j k ) of 83.29 mA cm −2 at 0.85 V, surpassing the benchmark commercial Pt/C electrocatalyst. When employed as the cathode in AEMFCs, LNOC-900 achieves a maximum peak power density (1.05 W cm −2 ) and current density (3.30 A cm −2 ) at 0.8 V. Density functional theory (DFT) reveals that N/O co-doping and defect engineering synergistically optimize ORR intermediate adsorption, with pyridinic-N embedded in a defective sp 2 carbon matrix, facilitating O–O bond cleavage via charge density modulation at defect sites. This work presents a sustainable, low-cost path to next-generation energy storage and conversion devices.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Pengyao Guo,Yuan Qin,Yujie Fang,Lei Ding
This study presents the rational design of a magnetically recoverable CoFe 2 O 4 /BiVO 4 @g-C 3 N 4 (CFO/BVO@CN) ternary heterojunction for highly efficient levofloxacin (LVFX) degradation via peroxymonosulfate (PMS) activation under visible light. The key innovation lies in the synergistic integration of a unique charge transfer pathway with interfacial M-N (M = Co, Fe, Bi, V) chemical bonding, as unequivocally evidenced by XPS. This atomic-level interfacial engineering creates efficient electron channels that not only promote the spatial separation of photogenerated carriers but also dramatically accelerate the dual redox cycles of metal species (Co 2+ /Co 3+ , Fe 2+ /Fe 3+ ).Crucially, the V 4+ /V 5+ pair functions as an efficient electron shuttle, facilitating the rapid regeneration of PMS-active Co 2+ and Fe 2+ sites and sustaining a high-efficiency catalytic process. Consequently, the optimized system achieves an exceptional LVFX removal rate of 98.8% within 30 min, driven predominantly by singlet oxygen ( 1 O₂) and superoxide radicals ( • O 2 − ). The catalyst demonstrates robust stability over multiple cycles, facile magnetic separation, and effective detoxification of LVFX. This work provides a novel paradigm for developing multifunctional photocatalytic systems by marrying heterojunction engineering with atomic-level interface modulation for sustainable water purification.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Du Haoming,Wu Shenghao,Zhao Yuxuan
In this study, a series of non-equimolar ratio high-entropy rock-salt-type oxides (Mg, Co, Ni, Cu, Zn)O were prepared a high-temperature solid-phase method with tailored cation ratios, and their physical phase compositions and electrochemical properties were investigated. The result shows that (Mg, Co, Ni, Cu, Zn)O with varying elemental ratios form single-phase rock-salt structures when they are sintered at 1100°C under non-equimolar conditions. These oxides display a uniformly elemental distribution and irregular spherical particle morphology. With the increase in Ni or Co content, the electrochemical performance is significantly improved. Compared to the other six high-entropy oxides, (Mg0.1625, Co0.1625, Ni0.35, Cu0.1625, Zn0.1625)O powders have demonstrated excellent energy storage properties and rate capability, achieving a specific capacitance of 384.3 F/g at 1 A/g and a coulombic efficiency of 88.9%. These results demonstrate that non-equimolar (Mg, Co, Ni, Cu, Zn)O high-entropy rock-salt-type oxides have promising potential as advanced electrode materials. Graphical
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Shihai Cao,Xiang Ma,Yuxin Yang,Yao Lu,Aiwu Sun
The combination of photocatalytic technology and advanced oxidation technology is a promising strategy for degrading recalcitrant antibiotic contaminants. In this study, a novel hybrid Photocatalysis-Self-Fenton (PSF) system that combines photocatalysis with the Fenton reaction was designed and used for sulfamethazine (SMR) antibiotics degradation. Firstly, a highly active oxygen-doped carbon nitride (CNO) nanosheet photocatalyst was synthesized using a simple and environmentally friendly approach. The prepared CNO nanosheets demonstrated increased exposure of active sites and improved separation of photoinduced electron-hole pairs, thus achieving a remarkable H 2 O 2 production rate of 863.8 μmol g −1 under visible light. Under the synergistic effect of a “photo-Fenton cycle” with Fe (II)，the CNO-based PSF system achieved efficient and stable removal of sulfathiazole (STZ) without external hydrogen peroxide addition. Consequently, the degradation efficiency of STZ under visible light increased significantly from 54.8 % to 98.2 % within 60 min, far exceeding the performance of pristine photocatalysts. This approach overcomes the limitations of traditional Fenton oxidation by enabling in-situ production and utilization of H 2 O 2 , and provides valuable insights into the design of photocatalytic self-Fenton processes for wastewater treatment.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Wenjing Kong,Xueyun Zhong,Ying Yan,Yun Xing,Lei Liu,Chuan Yu,Leneng Yang,Xiaofei Song,Mingli Fu
With the widespread use of waterborne coatings, the treatment of volatile organic compounds (VOCs), which is also easy to produce odor pollution, has become the major concern of the air pollution control in coating industry. Since the deep oxidation of the butyl acetate (BA) molecule requires the involvement of a large amount of reactive oxygen species, the catalytic oxidation of BA was promoted by weakening the Co-O bond strength on the cobalt oxide surface. In this study, we adopted a simple sacrificial template approach to fabricate a series of specifically shaped and uniform Co3O4 catalysts for the catalytic oxidation of BA. The flake CM71-C catalyst showed the most excellent catalytic properties of BA (T50 = 197 °C, T90 = 215 °C). According to the characterization results, flake CM71-C has the largest specific surface area and the weakest Co-O bond, which is more conducive to redox and oxygen activation capabilities of catalyst. The results of In-situ DRIFTS studies showed that the surface reactive oxygen species were continuously recharged during the reaction due to the higher oxygen activation capacity, which accelerated the rapid decomposition of carboxylate, a key reactive intermediate species in the deep oxidation of BA. This study provides a practical and effective way to gain insight into the role of oxygen vacancies in the preparation of efficient catalysts with specific morphology for VOCs oxidation.
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Small
·
2022
·Vol. 18
·期 13
·2106863
·
IF 15.153
Jie Huang,Yeqing Chen,Pengpeng Rao,Zongming Ni,Xueying Chen,Jie Zhu,Chen Li,Gaoyang Xiong,Ping Liang,Xin He,Songnan Qu,Jun Lin
Carbonized polymer dots (CPDs) have received tremendous attention during the last decade due to their excellent fluorescent properties and catalytic performance. Doping CPDs with transition metal atoms accelerates the local electron flow in CPDs and improves the fluorescent properties and catalytic performance of the CPDs. However, the binding sites and the formation mechanisms of the transition-metal-atom-doped CPDs remain inconclusive. In this work, Mn 2+ -ion–doped CPDs (Mn-CPDs) are synthesized by the hydrothermal method. The Mn 2+ ions form Mn O bonds that bridge the sp 2 domains of carbon cores and increases the effective sp 2 domains in the Mn-CPDs, which redshifts the fluorescence emission peak of the Mn-CPDs slightly. The Mn 2+ ions form covalent bonds in the CPDs and remedy the oxygen vacancies of the CPDs, which cuts off the non-radiative–recombination process of the Mn-CPDs and increases the quantum yield of the Mn-CPDs to 70%. Furthermore, the Mn O bonds accelerate the electron flow between adjacent sp 2 domains and enhances the electron transport in the Mn-CPDs. Thus, the Mn-CPDs demonstrate excellent catalytic performance to activate hydrogen peroxide (H 2 O 2 ) and produce hydroxyl radicals (•OH) to degrade methylene blue (MB) and rhodamine B (RhB).
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Huihui Zhang,Lushi Tan,Zhejuan Zhang,Guirong Zhang,Jiaxing Lu
In this work, different mass percentage of activated carbon (YBC) doped carbon paste electrodes (YBCPE) were firstly prepared, then electrodeposition of Pt nanoparticles was performed at a constant potential -0.1 V vs. Ag|AgCl|KCl (3 M) to prepare working electrodes Pt/YBCPE. It was shown that Pt/YBCPE(16%) exhibits the highest mass activity for formaldehyde oxidation compared to platinum deposited on pure carbon paste electrode (CPE) and other YBCPE(X%) electrodes. Afterwards, poly-o-anisidine (POA) film was prepared by electro-polymerization onto the CPE and YBCPE(16%) in o-anisidine monomer solution at 0.7 V and then Pt nanoparticles were electro-deposited at the POA film surface for fabrication of the Pt/POA/CPE and Pt/POA/YBCPE composite electrodes. The morphology of the composite electrodes was characterized by SEM, TEM, XRD and XPS which revealed that the presence of YBC and POA in the composite electrodes significantly improves the dispersion of Pt nanoparticles on the electrodes. Electrochemical impedance spectroscopy (EIS), chronoamperometry and cyclic voltammetry were used to verify the conductivity and durability of the composite electrode and its electro-catalytic activity. The obtained results indicated that the Pt/POA(16mC)/YBCPE(16%) exhibits excellent electro-catalytic activity towards the formaldehyde oxidation owing to the synergistic effect of the support-catalyst. Some comparisons for the electrooxidation of formaldehyde and the electrooxidation of methanol and formic acid on the composite electrodes also were conducted.
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ULTRASONICS SONOCHEMISTRY
·
2024
·
IF 8.7
Chao Zhang,Yu Zhang,Bin Qiu,Zhenhua Liu,Xueyan Gao,Nan Zhang,Xia Liu,Shasha Qi,Lingfei Li,Wei Liu
This study focuses on developing a water-in-oil-in-water (W 1 /O/W 2 ) double emulsion system using high-intensity ultrasound (HIU)-treated pea protein isolate (HIU-PPI) and pectin to encapsulate Lactobacillus plantarum ( L. plantarum ). The effects of ultrasound treatment on pea protein isolate (PPI) characteristics such as solubility, particle size, emulsification, surface hydrophobicity, and surface free sulfhydryl group were examined, determining optimal HIU processing conditions was 400 W for 10 min. The developed W 1 /O/W 2 double emulsion system based on HIU-PPI demonstrated effective encapsulation and protection of L. plantarum , especially at the HIU-PPI concentration of 4 %, achieving an encapsulation efficiency of 52.65 %. Incorporating both HIU-PPI and pectin as emulsifiers increased the particle size and significantly enhanced the emulsion’s viscosity. The highest bacterial encapsulation efficiency of the emulsion, 59.94 %, was attained at a HIU to pectin concentration ratio of 3:1. These emulsions effectively encapsulate and protect L. plantarum , with the concentration of HIU-PPI being a critical factor in enhancing probiotic survival under simulated gastrointestinal digestion. However, the concurrent utilization of pectin and HIU-PPI as emulsifiers did not provide a notable advantage compared to the exclusive use of HIU-PPI in enhancing probiotic viability during in vitro simulated digestion. This research offers valuable perspectives for the food industry on harnessing environmentally friendly, plant-based proteins as emulsifiers in probiotic delivery systems. It underscores the potential of HIU-modified pea protein and pectin in developing functional food products that promote the health benefits of probiotics.
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高影响因子
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