INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
·
IF 6.953
Chengsheng Ni,Wenxuan Lu,Jing Zhang,Luo Peng,Deti Xie,Jiupai Ni
This research studied the chemo-sensing of low-cost aminated pectin (PE) obtained by a facile calcination under ammonia gas at temperature no higher than 175 °C without excessive use of alkaline, acid or solvents. The ammonia gas was found to replace the hydroxyl and methoxyl group, enhancing the crystallinity and solubility of the resultant pectin than those calcined in air or in 5% H 2 . Though the increase of light absorption could be attributed mainly to the dehydration during calcination which caused the formation of C C double bond or aromatic ring, the N incorporation could be important to the photoluminescence (PL) emission. The PL quenching of the blue fluorescent aminated pectin showed a good linearity with the concentration of Cu 2+ , Fe 3+ and the highest sensitivity toward Cu 2+ among the investigated metal ions. In order to further increase the PL quenching toward Cu 2+ and decrease the interference of Fe 3+ , a method involving H 2 O 2 and ultraviolet illumination was developed to catalyze the oxidation of fluorophores on the polymer. This work provides new horizon on the modification and application of pectin in chemosensing.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Zhi-Jiang Wang,Wenming Ma,Jun-Mo Yang,Yani Kang,Yong-Doo Park
To gain insight into the effect of Cu 2+ on the activity and structure of alkaline phosphatase (ALP) from Macrobrachium rosenbergii , the enzyme was purified using ammonium sulfate fractionation, Sephacryl S-200, and DEAE anion exchange chromatography . We studied Cu 2+ -mediated inhibition and aggregation of ALP, and found that Cu 2+ significantly inactivated ALP activity with an IC 50 of 1.47 ± 0.02 mM. We further revealed that Cu 2+ reversibly inhibited ALP in a mixed-type manner with K i = 0.41 ± 0.02 mM. Time-interval kinetics showed that the inhibition followed first-order reaction kinetics . This process was associated with conformational changes and significant transient free-energy change. Spectrofluorometry results showed that Cu 2+ induced ALP tertiary structural changes, including the exposure of hydrophobic surfaces that directly induced ALP aggregation. The results provide new information regarding ALP from M. rosenbergii .
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ANALYTICAL CHEMISTRY
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2015
·
IF 5.636
Xiaorong Gan,Huimin Zhao,Shuo Chen,Hongtao Yu,Xie Quan
In the present work, three-dimensional porous HxTiS2 nanosheet–polyaniline (PANI) nanocomposites were first synthesized by a two-step method. First, HxTiS2 ultrathin nanosheets were prepared by the lithium intercalation and exfoliation method, followed by the surface polymerization reactions of aniline. The influences of the amount of HxTiS2 nanosheets on the nanocomposite morphology and electrochemical performances of the nanocomposites modified glass carbon electrode (HxTiS2 nanosheet–PANI/GCE) were investigated. The results demonstrated that the incorporation of HxTiS2 nanosheets as a suitable substrate can regulate the growth of PANI, enhance the electrode stability and improve interfacial electron transfer rates. In addition, based on the nanocomposites, we developed a novel electrochemical sensor to directly detect trace Cu2+, and discovered that the coordination interaction between Cu2+ cations and the N atoms of the imine moieties in PANI endowed the electrochemical sensor with high selectivity. Because of the synergetic effects of HxTiS2 nanosheets and PANI, the as-prepared electrochemical sensor exhibited highly sensitive and selective assaying of Cu2+ with a detection limit of 0.7 nM (signal-to-noise ratio (S/N) equal to 3) and a linear range from 25 nM to 5 μM, under optimal conditions.
研究领域:
材料科学
·
分析化学
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Hao Fang,Peng-Cheng Huang,Fang-Ying Wu
In this work, a simple and easily synthesized Schiff-based derivative colorimetric and fluorescent sensor ( 1 ), 4-dimethylamino-benzoic acid (2-imidazole formaldehyde)-hydrazide, was obtained for the detection of Cu 2+ and S 2− . The compound 1 exhibited dual spectral responses to Cu 2+ , that is, vivid color change and fluorescence enhancement in the presence of Cu 2+ . The detection limits were valued as 0.46 μM and 15 nM according to absorption and fluorescent response, respectively. Both of them are below the World Health Organization (WHO) guidelines for drinking water (31.5 μM). In addition, the ensemble ( 1-Cu 2+ ) selectively and sensitively detected a low concentration of S 2− . As the addition of S 2− instantly removed Cu 2+ from the ensemble ( 1-Cu 2+ ) resulting in a color change from yellow to colorless and a “turn-off” fluorescent response. The detection limit for S 2− was estimated as 0.12 μM (from fluorescent method) and 0.68 μM (from absorption method), respectively, each of which was also lower than the maximum allowable level of S 2− (15 μM) in drinking water defined by the WHO. The binding process was confirmed via UV–vis absorption, fluorescence measurements, 1 H NMR, mass spectroscopy and density functional theory calculation. What's more, successful practical application of test paper is used to inspect the S 2− which means the convenient and rapid assay in real samples can be achieved.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Caiyan Yu,Linying Yang,Shuwei Sun,Di Chen,Yanfeng Yin,Hui Ying Yang,Ying Bai
Due to their high theoretical specific capacities and good structural compatibility, O3-layered oxides are considered as high-performance cathode candidates for sodium-ion batteries. However, serious side reactions and structural degradation during long-term cycling have greatly hindered their practical applications. Herein, O3-type NaNi 0.5 Mn 0.5 O 2 (NNMO) was prepared by partially substituting Ni 2+ with Cu 2+ and inducing CuO surface coating to enhance the structural stability without sacrificing the high capacity. In Particular, Cu 2+ incorporated at a molar ratio of 0.10 greatly improved the electrochemical performance of pristine NNMO. The NaMn 0.5 Ni 0.4 Cu 0.1 O 2 electrode exhibited a capacity retention of 64.5% after 300 cycles at 0.5 C. Microscopic and spectral studies revealed that the CuO coating layer suppressed detrimental side reactions upon cycling. Moreover, the bulk doping of Cu 2+ ultimately enhanced the structural stability by mitigating irreversible phase transitions. Hence, the integration of bulk Cu 2+ doping and CuO surface coating contributed to the increased structural stability and electrochemical performance of NNMO. The doping and coating dual-modification strategy established in this work effectively suppressed the side reactions and structural degradation of NNMO, and this work provides new insight into the effective design of electrode microstructures for use in high-performance batteries.
研究领域:
材料科学
·
能源存储
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Nanoscale
·
2016
·Vol. 8
·期 40
·17489-17495
·
IF 7.76
Zhixiang Lu,Mingjiang Wu,Shuang Wu,Shaoxiong Yang,Yuan Li,Xiaolan Liu,Liyan Zheng,Qiue Cao,Zhongtao Ding
Transformation of aggregation induced emission (AIE) molecules into functional materials can greatly tune their fluorescence properties and expand their related potential applications. Here, we demonstrate a facile strategy to modulate the fluorescence properties of AIE molecules by confining them within the nanochannels of metal–organic frameworks (MOFs). AIE molecules (4,4′-(hydrazine-1,2-diylidene bis(methanylylidene)) bis(3-hydroxybenzoic acid), HDBB) with pH-dependent emission were successfully integrated into UiO-66 resulting in a UiO-66⊃HDBB complex while maintaining the crystal structure by the host–guest process. The fluorescence properties of HDBB can be modulated by virtue of the unique nanospace confining effect. Furthermore, UiO-66⊃HDBB was used as a sensitive and selective fluorescent probe for Cu2+ detection in aqueous solution. This study provides a facile strategy for the construction of high performance AIE based luminescent materials with adjustable properties for potential applications.
研究领域:
材料科学
·
化学传感
·
光学材料
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CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Beibei Shan,Yawen Zhao,Yiwen Li,Haitao Wang,Rui Chen,Ming Li
Dual-plasmonic Au–Cu2–xE (x > 0, E = S, Se, Te) hybrids present multifunctionalities for broad applications in photovoltaics, photocatalysis, and biomedicine. However, despite the increasing interest in these dual-plasmonic Au–Cu2–xE hybrids, precise control over the morphology and size of their substituents is crucial but greatly challenging. Herein, a selenium-mediated two-step synthetic approach is developed to prepare the Au@Cu2–xSe nanocrescents with precise control over their size and tunable plasmonic properties through varying the concentration of the SeO2 precursor. The complete encapsulation of the Au domain within the Cu2–xSe layer in the nanocrescent in an asymmetric manner enables the strong coupling between their substituents, significantly enhancing their optical properties supported by both experimental results and theoretical modeling. The increasing Cu2–xSe domain size enables the tuning of carrier densities and thereby molar extinction coefficients corresponding to the respective visible and near-infrared (NIR) plasmon bands of the Au@Cu2–xSe nanocrescents. Electron transfer from the Au to Cu2–xSe domains is unambiguously determined in the Au@Cu2–xSe nanocrescents by transient absorption (TA) and extinction spectral measurements. The Cu2–xSe-dependent bleaching amplitude and carrier dynamics of both visible and NIR plasmon TA signals are observed, along with variations of the carrier–phonon and phonon–phonon relaxation processes. This work not only presents a facile synthetic approach of high-quality dual-plasmonic Au@Cu2–xSe nanocrescents and a fundamental understanding of the coupling mechanism in the Au–Cu2–xSe hybrid system, but also provides a paradigm for the study on the interplay in a dual-plasmonic metal–semiconductor system.
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Chemosensors
·
2022
·Vol. 10
·期 5
·169
·
IF 4.229
Shubo Zhang,Yanwen Liu,Juan Wang,Zhihong Liu
Tracking fluctuations in the Cu2+level in sweat is meaningful for non-invasive and real-time assessment of Cu2+-abnormality-related diseases and provides important diagnostic information. However, the user-unfriendly ways to obtain sweat and sweat biofouling have limited the development of this field. Herein, we exploit a highly sensitive photoelectrochemical (PEC) sensor as a detection method, a powerful laser engraving technique for the large-scale fabrication of laser-induced graphene and In-doped CdS (LIG-In-CdS) photoelectrodes, and a hydrophilic porous polyvinyl alcohol (PVA) hydrogel for natural sweat collection for fingertip touch sweat Cu2+monitoring. The proposed sensor has several very attractive features: (i) the LIG-In-CdS photoelectrode with high photoelectric conversion efficiency can be produced by a cheap 450 nm semiconductor laser system; (ii) the sensor performs Cu2+detection with a wide linear range of 1.28 ng/mL~5.12 μg/mL and good selectivity; (iii) the PVA hydrogel possesses an excellent antifouling effect ability and a rapid natural sweat collection ability; and (iv) the sensor exhibits feasibility and good reliability for PEC sensing of sweat Cu2+. Thus, these advantages endow the proposed method with a great deal of potential for smart monitoring of heavy metals in sweat in the future.Keywords:natural sweat;photoelectrochemical sensor;antifouling;laser engraving method;Cu2+
研究领域:
生物医学工程
·
分析化学
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xiaohua Huang,Lijia Wang,Xiaojun Zhang,Xuehua Yin,Na Bin,Fenfen Zhong,Yingju Liu,Qingyun Cai
An upconversion luminescence (UCL) probe for the detection of Cu 2+ is constructed by assembling meso-tetra(4-sulfonatophenyl)porphine dihydrochlorid (TSPP) on SiO 2 -encapsulated β-NaYF 4 :Yb,Er,Gd nanorods which were synthesized by hydrothermal reaction and encapsulated with a layer of ultrathin silica through a water-in-oil reverse microemulsion strategy. Under excitation of 980 nm, the nanorods emit upconversion lights at 545 nm and 659 nm, respectively. While in the presence of Cu 2+ , Cu 2+ forms complex with TSPP, which shifts the maximum absorption of TSPP from 515 to 545 nm. As the maximum absorption of TSPP-Cu 2+ is overlapped with the emission at 545 nm of the nanorods, the luminescence energy of the nanorods can be transferred to TSPP–Cu 2+ complex, resulting in a quench of the emission at 545 nm, while the upconversion emission at 659 nm is not affected by Cu 2+ , and can be used as a reference. Cu 2+ was therefore quantified based on the ratio of the upconversion luminescence at 545 to that at 659 nm. Using the ratiometric upconversion luminescence as detection signal, the nanoprobe shows high selectivity and sensitivity towards Cu 2+ with a limit of detection of 2.16 μM, and a quick response time of within 10 s. The analysis of Cu 2+ in Hela cell lysates indicates the potential applications of this nanoprobe in the near-infrared fluorescent imaging of Cu 2+ in cells.
研究领域:
生物化学
·
分析化学
·
材料科学
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CRYSTENGCOMM
·
2019
·Vol. 22
·期 4
·678-685
·
IF 3.382
Xiao Shao,Tianyong Zhang,Bin Li,Yue Wu,Xiaoyuan Ma,Jingchao Wang,Shuang Jiang
Copper sulfide (Cu2−xS) is a kind of cation deficient transition metal sulfide, which has attracted great interest due to its unique properties that arise from degenerate vacancy-doping, particularly its tunable localized surface plasmon resonance (LSPR) properties. In this work, a range of vacancy-doped Cu2−xS nanocrystals (NCs) (Cu1.2S, Cu1.4S, Cu1.75S, and Cu1.94S NCs) with a size of around 10 nm was prepared with tunable LSPR through a hot injection method. The doping level was manipulated effectively by varying the injection volume of sulfur powder–oleic acid (S–OA) to finely tune the LSPR wavelength. Cu2−xS NCs with four different doping levels were investigated as photocatalysts for degradation of dyes. The Cu1.94S NCs with the highest LSPR energy exhibited the best photocatalytic activity due to the highest free carrier density, presumably influenced by Cu vacancies and the volume of the S–OA solution. Theoretical calculations of the free carrier density of Cu2−xS NCs are consistent with the order of the photocatalytic activity. The results demonstrate that the correlation of the photocatalytic activity with the corresponding concentration of free holes and the LSPR wavelength is of interest, which will provide inspiration for the design of non-noble metal catalysts by regulating the free hole concentration in degenerate p-doped Cu2−xS caused by cation vacancies.
研究领域:
材料科学
·
纳米技术
·
化学
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高影响因子
Acta Crystallographica Section C-Structural Chemistry
·
2019
·Vol. 75
·期 7
·927-934
·
IF 0.93
Xie L.-Y.,Zhang Y.,Xu H.,Gong C.-D.,Du X.-L.,Li Y.,Wang M.,Qin J.
Two acylhydrazone complexes, bis{6-methyl-N′-[1-(pyrazin-2-yl-κN1)ethylidene]nicotinohydrazidato-κ2N′,O}nickel(II), [Ni(C13H12N5O)2], (I), and di-μ-azido-κ4N1:N1-bis({6-methyl-N′-[1-(pyrazin-2-yl-κN1)ethylidene]nicotinohydrazidato-κ2N′,O}nickel(II)), [Cu2(C13H12N5O)2(N3)2], (II), derived from 6-methyl-N′-[1-(pyrazin-2-yl)ethylidene]nicotinohydrazide (HL) and azide salts, have been synthesized. HL acts as an N,N′,O-tridentate ligand in both complexes. Complex (I) crystallizes in the orthorhombic space group Pbcn and has a mononuclear structure, the azide co-ligand is not involved in crystallization and the Ni2+ centre lies in a distorted {N4O2} octahedral coordination environment. Complex (II) crystallizes in the triclinic space group P\overline{1} and is a centrosymmetric binuclear complex with a crystallographically independent Cu2+ centre coordinating to three donor atoms from the deprotonated L− ligand and to two N atoms belonging to two bridging azide anions. The two- and one-dimensional supramolecular structures are constructed by hydrogen-bonding interactions in (I) and (II), respectively. The in vitro urease inhibitory evaluation revealed that complex (II) showed a better inhibitory activity, with the IC50 value being 1.32±0.4 µM. Both complexes can effectively bind to bovine serum albumin (BSA) by 1:1 binding, which was assessed via tryptophan emission–quenching measurements. The bioactivities of the two complexes towards jack bean urease were also studied by molecular docking. The effects of the metal ions and the coordination environments in the two complexes on in vitro urease inhibitory activity are preliminarily discussed.
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Journal of Nanomaterials
·
2018
·
IF 2.207
Jiaxin Wang,Shuhan Wang,Wanqing Tian,Dong Yao,Lining Sun,Liyi Shi,Jinliang Liu
Pollution caused by copper is one of the key factors of environment contamination. As one of the heavy metals, copper is hard to decompose in nature; the biological enrichment of which may lead to severe damage to health. Cu2+ detection, thus, possesses a bright application prospect both in environment protection and in human health. In this paper, a dual-functional fluorescence-magnetic composite nanoplatform has been designed to sensitively detect, meanwhile, capture, and remove Cu2+ in the solution of water and ethanol (1 : 1, v/v). The core-shell structure nanoparticle synthesized by using Fe3O4 as core and SiO2 as shell is covalently bonded with rhodamine derivatives on the silica layer to construct the nanoplatform. The emission is increased upon the addition of Cu2+, showing fluorescence turn on effect for the detection, and the limit of detection is as low as 1.68 nM. Meanwhile, Cu2+ ions are captured by the coordination with rhodamine derivatives and can be removed with the help of magnetic field.
研究领域:
环境科学
·
材料科学
·
分析化学
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高影响因子
危险品化学品经营许可证（带存储）