Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 19
·12176-12190
·
IF 10.733
Chao-Jie Ma,Ya Chen,Cheng Zhu,Qi Chen,Wei-Li Song,Shuqiang Jiao,Haosen Chen,Daining Fang
Perovskite materials (ABX3) are significant for energy storage and conversion, and most of the electrochemical processes are currently known to link with the reaction from the active B site. Here, a novel electrochemical active reaction is observed from the A site in perovskite bismuth ferrite (BiFeO3) nanoparticles. With bismuth ion extraction from the A site, single-phase BiFeO3 is found to convert into two phases, namely, Bi2O3 and residual Bi-deficient BiFeO3, and these irreversible products undergo additional separate electrochemical processes in the subsequent cycles. The fundamental understanding suggests that the extracted Bi3+ ions play a dominant role in the electrochemical process via redox reactions of Bi3+ ⇌ Bi2+ ⇌ Bi0. Interestingly, such an electrochemical reaction involving the A site could also be suppressed via heteroatom doping at the A site (yttrium ions), which effectively supports the mechanism of ion extraction. The perspectives for the novel mechanism in electrochemical energy storage are further discussed.
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JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Zhen Luo,Ying Xu,Cui-Ran Gong,Yang-Qing Zheng,Zhao-Xi Zhou,Li-Ming Yu
Urushiol monomers , which are used as a new ultraviolet curable binder (Ur Binder), have been directly applied to prepare silicon/graphite electrodes of lithium batteries . Investigations show that the Ur Binder is conducive to the preparation of uniform electrode slurry and the formation of uniform electrode coating layer, which makes a close contact between electrochemical active materials and conductive carbon. Besides that, strong interaction between the polymer of the Ur Binder and silicon powders plays a key role in the long-cycling lithium battery. Lithium coin cells using the Ur Binder achieve a capacity of 603.3 m Ah g −1 and excellent capacity retention of 96.1% after 400 cycles. Even at a high current density of 2.0C, the coin cell with the Ur Binder maintains approximately 77.9% of its original capacity (0.2C rate). Notably, slurry containing the Ur Binder can be superimposed on copper foil for coating and curing, which helps to relieve the low capacity limitations of ultraviolet curable silicon/graphite electrodes for commercial applications.
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LANGMUIR
·
2021
·
IF 3.882
Yixian Luo,Dou Jin,Wenjin He,Jianzhong Huang,Aicheng Chen,Feng Qi
The opal-like SiO2 microcarriers with different pore diameters named opal-SiO2I and opal-SiO2II were synthesized and utilized as microcarriers to immobilize Rhizopus oryzae lipase (ROL) and Aspergillus oryzae α-amylases (AOA). ROL and AOA can be more stably immobilized on the cross-linked SiO2 opals by neopentyl glycol diglycidyl ether (NGDE), which is the first attempt to use it as a cross-linking agent compared with glutaraldehyde. According to the morphology analysis, multiple layers of SiO2 monodisperse microspheres were regularly packed and formed an opal-like structure, and enzymes were well scattered and immobilized throughout the SiO2 opals. The results showed that the performance of enzymes immobilized on opal-SiO2II with a larger specific surface area was much better than that of opal-SiO2I. The enzyme activity of ROL@opal-SiO2II and AOA@opal-SiO2II cross-linked with 1% NGDE increased 5.32 and 9.32 times compared with their free counterpart, respectively. Furthermore, pH and thermal stability and reusability of ROL/AOA@opal-SiO2II were significantly improved and higher than those of ROL/AOA@opal-SiO2I and free enzymes. This study provides an easily obtained microcarrier opal-SiO2II, which shows potential for efficient different enzyme immobilizations and further industrial applications.
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PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2018
·
IF 6.042
Yuchen Jin,Qi Kang,Xinli Guo,Bin Zhang,Dazhong Shen,Guizheng Zou
Signal amplification for electrochemiluminescence (ECL) has conventionally been achieved by employing effective matrixes that can accelerate the electrochemical redox processes or carry more electrochemiluminophores. Herein, a convenient signal-amplification strategy was proposed for an ECL immunoassay with carboxylated g-C3N4 nanosheets (NSs) as tags and carcinoembryonic antigen (CEA) as the model target via electrochemically pretreating the substrate: a glassy-carbon electrode (GCE) modified with a polymerized 2-aminoterephthalic acid (ATA) film (GCE/ATA). Bioconjugates of g-C3N4 NSs and the signal CEA antibody (Ab2) (i.e., g-C3N4 NS–Ab2) were immobilized on GCE/ATA via a sandwich immunoreaction to form GCE/ATA–Ab1–Ag–Ab2–NSs. Electrochemical-impedance spectroscopy and potential-resolved ECL characterization proved that GCE/ATA plays an important role in the electron-transfer resistance (Ret) of the GCE/ATA–Ab1–Ag–Ab2–NSs for ECL and that successively scanning GCE/ATA–Ab1–Ag–Ab2–NSs from 0 to −1.6 V in K2S2O8- and H2O2-containing medium could reduce the Ret and bring out 3.3-times-enhanced ECL at the 10th scan cycle compared with that of the 1st scan cycle, which was about 10.2 times the ECL of the GCE/ATA–Ab1–Ag–Ab2–NSs in medium containing merely K2S2O8. Inspired by this, direct and successive scanning of GCE/ATA in K2S2O8- and H2O2-containing medium was employed during fabrication, which dramatically reduced the Ret of GCE/ATA–Ab1–Ag–Ab2–NSs and brought out obviously enhanced ECL responses for selectively determining CEA from 0.1 pg/mL to 1 ng/mL, with a detection limit of 3 fg/mL.
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PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Hongyang Wang,Yu Zhang,Shuai Lan,Lei Cao,Fei Peng,Dandan Jia,Dongjun Wang
The green fluorescent protein (GFP) shows a vivid model to design and fabricate fluorescent materials, however, a simple and generic strategy has not been really achieved to mimic the GFP system. Here we report a strategy to prepare nanoscale micelles acting like the “nano-can” in GFP, enabling a group of non-luminous amines to fluoresce. The fluorescent systems can be fabricated by mixing two kinds of commercially available non-conjugated precursors, one is amphiphilic ring-type compound for micelle, the other is amine for chromophore . Our results suggest that the nanoscale micelles provide ideal confined domains, within which amine compounds can form effective chromophores. The micelle-triggered method is generalizable to various kinds of precursors, and the emission can be tuned at different colors upon altering precursors. The presented strategy will be a starting point for a new luminescent research area in which we pay more attention on the environment than chromophore.
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Foods
·
2023
·Vol. 12
·期 24
·4425
·
IF 5.2
Xiaosan Zhang,Guangrong Huang,Hua Liu,Wenwei Chen,Jing Zhao,Zhenbao Jia,Fei Tao
Inhibiting α-amylase can lower postprandial blood glucose levels and delay glucose absorption, offering an effective approach for the development of antidiabetic diets. In this study, an active constituent with inhibitory activity against α-amylase was isolated and purified by bioassay-guided fractionation fromCarya cathayensisSarg. peel (CCSP). The active constituent was identified by NMR and Q-Exactive Orbitrap Mass Spectrometry as 5-O-p-coumaroylquinic acid (5-CQA). 5-CQA possessed strong inhibitory activity against α-amylase, with an IC50 value of 69.39 µM. In addition, the results of the kinetic study indicated that 5-CQA was a potent, reversible, noncompetitive inhibitor against α-amylase. The findings indicate that 5-CQA derived from CCSP has potential as a novel inhibitor against α-amylase, which can help mitigate postprandial blood sugar spikes, making it suitable for inclusion in antidiabetic diets.Keywords:Carya cathayensisSarg. Peel;postprandial hyperglycemia;5-O-p-coumaroylquinic acid;α-amylase inhibitor
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PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Sainan Cao,Bingjie Zou,Jingxia Yang,Jinjie Wang,Huangdi Feng
A heterogeneous catalyst CuO–CeO2 with a hollow structure was successfully synthesized by assembling CuO on the outer surface of CeO2 hollow spheres through a layer-by-layer deposition strategy. Further reduction under a H2 atmosphere was carried out to modify its surface state, resulting in sample r-CuO–CeO2. The catalysts were characterized by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform-infrared spectroscopy (FT-IR). SEM and TEM showed that the synthesized catalysts had a hollow sphere structure, which can expose more active sites and promote mass transfer. The results of XPS revealed that the content of Cu0&Cu+ increased from 13.6 to 19.0% after H2 reduction, which was conducive to the activation of terminal alkyne to promote the annulation/A3-coupling reaction. The conversion of this cascade reaction with the r-CuO–CeO2 catalyst can reach more than 95%, while the value was only 55% by using CuO–CeO2 as a catalyst. Moreover, the r-CuO–CeO2 catalyst showed a good recycle property and group compatibility in the general applicability of the cascade annulation/A3-coupling reaction, providing a series of propargylamine derivatives in good chemoselectivity.
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高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 18
·期 7
·2147-2154
·
IF 8.02
Alei Zhang,Cong Gao,Jing Wang,Kequan Chen,Pingkai Ouyang
In this study, we present an efficient affinity adsorption–enzymatic reaction integrated approach to produce N-acetyl-D-glucosamine (GlcNAc) from crude chitin powders (CP). Chitinase was first purified from the crude enzyme mixture by affinity adsorption on the CP substrate, with ∼92.7% recovery of the enzyme achieved within 10 minutes in the presence of 20 g L−1 of CP under optimized conditions. The chitinase then efficiently converted 40 g L−1 of CP to 39.3 g L−1 of GlcNAc in a batch enzymatic reaction for 4 days, achieving nearly 100% conversion of the substrate CP. The product GlcNAc was easily separated from hydrolysates after destaining, concentrating, crystallizing and drying processes with a high purity of 98%. In addition, the chitinase can be conveniently reused for several batches by the affinity adsorption–enzymatic reaction approach, giving an average yield of 29.6 g L−1 of GlcNAc based on 30 g L−1 of CP as the substrate.
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高影响因子
CRYSTENGCOMM
·
2019
·Vol. 22
·期 3
·448-457
·
IF 3.382
Hao Liu,Xing Yang,Shanyu Wu,Mingtao Zhang,Sean Parkin,Shuang Cao,Tonglei Li,Faquan Yu,Sihui Long
Flunixin [2-(3-trifluoromethyl-2-methyl-phenylamino)-nicotinic acid, FLX], a potent nonsteroidal anti-inflammatory drug widely used in veterinary medicine, was found to exist in at least two crystal forms (I and II), in contrast to clonixin [2-(3-chloro-2-methyl-phenylamino)-nicotinic acid, CLX], which exists in four solvent-free forms and multiple solvates. Form I was harvested from a variety of solvents and characterized by single-crystal X-ray diffraction, PXRD, FT-IR, and Raman spectroscopy. Its crystal structure is sustained on the strong acid–pyridine hydrogen bond. Form II was generated by thermal treatment of form I. Other aspects of this polymorphic system were investigated both experimentally and theoretically. Quantum chemistry calculations were performed to shed light on the lack of polymorphism from solution-phase crystallization. Conformational scan of the dihedral angle C2–N7–C8–C9 (τ) revealed two stable conformations, one with τ near 170°, and the other near 70°, corresponding to the molecule in the crystal. Hirshfeld analysis accounted for the major intermolecular interactions contributing to the overall stability of the crystal.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Ping Xiao,Guodong Zhu,Xiaohong Shang,Bin Hu,Boshuang Zhang,Zhaoyu Tang,Jianmao Yang,Jianyun Liu
The Fe-metal organic framework decorated MXene (Fe-MOF/MXene) was in-situ synthesized by one-step hydrothermal method in the presence of MXene. Using Fe-MOF/MXene as modifier, the obtained Fe-MOF/MXene electrode presented excellent electrochemical activity due to the high surface area and good conductivity of MXene. A sensitive arsenite electrochemical sensor was fabricated based on the strong As-hydroxyl bonding at the Fe-MOF/MXene electrode, confirmed by X-ray photoelectron spectroscopy. Cyclic voltammetry characterization indicated that MXene facilitated the charge transfer with enhanced electrochemical response. The Fe-MOF/MXene modified electrode exhibited super-high current response to As(III) by square wave anodic stripping voltammetry, with extremely high sensitivity (8.94 µA·(ng·L −1 ) −1 ·cm −2 ) and super-low limit of detection (0.58 ng·L −1 ). The analysis of the real water demonstrated that the Fe-MOF/MXene-based sensor was feasible for the detection of As(III) in practical application.
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Polymer Chemistry
·
2017
·Vol. 8
·期 34
·5071-5076
·
IF 5.375
Lei Yang,Yongsan Li,Yanzi Gou,Xing Wang,Xinming Zhao,Lei Tao
Chemotherapy has contributed greatly in clinical anti-tumor treatment. However, the traditional method of drug delivery by intravenous injection has several drawbacks, such as low delivery efficiency, high toxicity and frequent pain caused by injection. To overcome these defects, intra-tumor injection has been proposed in recent years, and the development of suitable carriers to locate the drug at the desired position for optimum dispersal is crucial to realize the superiority of intra-tumor injection. Herein, we report the application of a chitosan-based self-healing hydrogel, constructed through Schiff's bases, as an injectable drug carrier for in vivo intra-tumor therapy. This smart carrier could deliver highly concentrated anti-tumor drug (Taxol) to the desired position (human hepatocarcinoma tumor) for steady in situ release at a safe level. The self-healing drug carrier could adapt to the intra-tumor structure and regenerate as a whole, thus avoiding the fast leak of loaded drug, leading to admirable therapeutic effects compared with controls (direct injection of drug solution or use of non-self-healable thermal-sensitive hydrogel as the drug carrier). Due to its excellent biocompatibility and high operability, this injectable self-healing hydrogel might be a promising drug carrier for tumor chemotherapy and other medical applications.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2012
·
IF 2.098
Yunchang Fan,Sheli Zhang,Qiang Wang,Junhai Li,Haotian Fan,Dongkai Shan
The interaction of an amino-functionalized ionic liquid, 1-(2-aminoethyl)-3-butylimidazolium bromide ([NH 2 C 2 C 4 im]Br) with two enzymes, pepsin and papain was investigated using fluorescence spectroscopic technique. It is found that [NH 2 C 2 C 4 im]Br has strong ability to quench the intrinsic fluorescence of pepsin and papain. Quenching mechanisms are considered as static quenching for papain and dynamic quenching for pepsin, respectively. The binding constants and the number of binding sites ( n ) of [NH 2 C 2 C 4 im]Br to papain were calculated at different temperatures. The thermodynamic parameters such as free energy change (Δ G ), enthalpy change (Δ H ) and entropy change (Δ S ), were calculated by thermodynamic equations. The values of Δ G , Δ H and Δ S suggest that interaction of [NH 2 C 2 C 4 im]Br with the two enzymes is spontaneous. Hydrogen bonding and van der Waals interactions play important roles in the binding process of [NH 2 C 2 C 4 im]Br to papain. However, hydrophobic interaction is the main driving force for the interaction of [NH 2 C 2 C 4 im]Br with pepsin. The results of three-dimensional fluorescence spectra show that [NH 2 C 2 C 4 im]Br has no obvious effects on the polypeptide structures of the two enzymes. Additionally, the [NH 2 C 2 C 4 im]Br-containing system can slightly increase the activities of the two enzymes.
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危险品化学品经营许可证（带存储）