SENSORS AND ACTUATORS B-CHEMICAL
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2013
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IF 3.535
Kai Zhang,Ge Song,Yinfeng Li,Xianli Wu,Kunjing Li,Baoxian Ye
A facile and highly sensitive electrochemical sensor for kaempferol was fabricated by doping polyvinyl pyrrolidone cladding quantum dots to the carbon paste electrode. The quantum dots were characterized with transmission electron microscopy , ultraviolet spectrum and infrared spectrum. The electrochemical behaviors and kinetic parameters of kaempferol were investigated on the sensor by cyclic voltammetry and chronocoulometry in NaAc–HAc (pH 4.4). The proposed sensor accelerated the redox processes of kaempferol obviously, and the oxidation currents were linearly relationship with kaempferol in two concentration intervals: one was 6.0 × 10 −8 –2 × 10 −6 mol/L and the other was 5.0 × 10 −6 –2.5 × 10 −5 mol/L. The quantification limit obtained by square wave voltammetry was 6.0 × 10 −8 mol/L. Merits such as extreme simplicity, low cost, good sensitivity, high sensitivity, good stability and reproducibility made it an excellent electrochemical sensor for kaempferol. A new electroanalytical method for kaempferol was proposed and used for determination of kaempferol in tablets with satisfactory results.
研究领域:
分析化学
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电化学
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DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
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2017
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IF 3.177
Jing Zhang,Qing Tang,Zhong-Zheng Gao,Ying Huang,Xin Xiao,Zhu Tao
Two supramolecular assemblies between twisted cucurbit[14]uril and hemicyanine dyes have been successfully constructed on the basis of host–guest recognition. These supramolecular assemblies could be reversibly switched under acidic and neutral conditions. Furthermore, they responded to selected chemical stimuli such as methyl violet, thereby exhibiting potential analysis application.
研究领域:
化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2018
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IF 5.123
Juanmin Li,Huipeng Zhou,Yunyi Zhang,Sohail Anjum Shahzad,Meiding Yang,Zhenzhen Hu,Cong Yu
Silver nanoparticles (Ag NPs) enhanced perylene probe excimer emission is reported for the first time. It was observed that strong interactions between the perylene probe and the Ag NPs induced co-aggregation. As a result, a new in situ generated plasmonic absportion band of the Ag NPs at longer wavelength emerged. The monomer emission of the perylene probe was efficiently quenched, and dramatically enhanced probe excimer emission was observed. A remarkable emission enhancement of over 1000 fold was obtained compared to anionic polymers and other nanoparticles. The excimer emission intensity could be finely modulated by the size of the Ag NPs and the functionalities of the perylene probe. The observed Ag NPs enhanced perylene probe excimer emission shows good potential for the development of novel sensing techniques for various bioanalytical applications.
研究领域:
化学
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材料科学
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生物分析
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产品关联
DOI
PubMed
高影响因子
GLYCOCONJUGATE JOURNAL
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2016
·Vol. 33
·期 2
·159-168
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IF 1.828
Liu Fang F.,Kulinich Anna,Du Ya M.,Liu Li,Voglmeir Josef
Two putative α-mannosidase genes isolated from the rather unexplored soil bacterium Solitalea canadensis were cloned and biochemically characterised. Both recombinant enzymes were highly selective in releasing α-linked mannose but no other sugars. The α-mannosidases were designated Sca2/3Man2693 and Sca6Man4191, and showed the following biochemical properties: the temperature optimum for both enzymes was 37 °C, and their pH optima lay at 5.0 and 5.5, respectively. The activity of Sca2/3Man2693 was found to be dependent on Ca 2+ ions, whereas Cu 2+ and Zn 2+ ions almost completely inhibited both α-mannosidases. Specificity screens with various substrates revealed that Sca2/3Man2693 could release both α1-2- and α1-3-linked mannose, whereas Sca6Man4191 only released α1-6-linked mannose. The combined enzymatic action of both recombinant α-mannosidases allowed the sequential degradation of high-mannose-type N-glycans. The facile expression and purification procedures in combination with strict substrate specificities make α-mannosidases from S. canadensis promising candidates for bioanalytical applications.
研究领域:
微生物学
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酶学
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生物化学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2024
·Vol. 48
·期 20
·9358-9365
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IF 2.7
Junfeng Wang,Shuyue Tian,Sihua Pan,Yujuan Zhang,Wang Sun,Yang Wang
The effective assembly of hollow nanomaterials is of great importance for the rapid advancement of electroanalytical platforms. Herein, the hollow tubular zeolite imidazolium framework-8 (HTZIF-8) was carefully constructed via the precursor conversion pathway. Subsequently, the predictable assembly of HTZIF-8 with carbon nanotubes (CNTs) occurred to form a unique hollow dual-tube MOF hybrid material (HTZIF-8@CNTs). Meanwhile, the HTZIF-8@CNTs electroanalytical platform was established with dopamine (DA) as the objective biomolecule. In the electrochemical evaluation, the linear intervals of 0.06–600 μmol L−1 and detection limit of 0.02 μmol L−1 (S/N = 3) were determined, which were mainly ascribed to nano-synergistic engineering of HTZIF-8 and CNTs. The HTZIF-8@CNTs hybrid material exhibited superior electrocatalytic performance for DA compared to the solid rod-like MOF composite (SRZIF-8@CNTs), which was majorly based on the faster mass transfer characteristics of hollow MOFs. Additionally, the HTZIF-8@CNTs electrochemical sensor presented outstanding anti-interference capabilities as well as stability and could be utilized for the detection of DA in real samples. The employment of F and t statistics were employed to ensure the reliability of the results. This study will offer novel thoughts toward the application of hollow MOF composites in the area of electroanalytical platforms.
研究领域:
材料科学
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电化学
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分析化学
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产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2017
·
IF 4.95
Gang-Wei Wu,Yi-Min Shen,Xiao-Qiong Shi,Hao-Hua Deng,Xiao-Qing Zheng,Hua-Ping Peng,Ai-Lin Liu,Xing-Hua Xia,Wei Chen
In this work, bimetallic Bi/Pt nanoparticles in bovine serum albumin biomolecular scaffold (BSA-Bi/PtNPs) were synthesized through a facile and green method. As compared with BSA-PtNPs, the BSA-Bi/PtNPs possess enhanced peroxidase-like catalytic activity . Moreover, the BSA-Bi/PtNPs are stable in harsh conditions such as high temperature, extreme pH environments, and high ionic strength , as well as in common biological matrixes. These prominent advantages enable the BSA-Bi/PtNPs to be applied to a wide range of fields. Bioassays, such as serum glucose detection, extracellular hydrogen peroxide (H 2 O 2 ) monitor, and cancer cells labeling, have been realized with satisfying results. The linear range of glucose determination was from 1 to 100 μM and the limit of detection (LOD) was 0.2 μM. The H 2 O 2 released from each MCF-7 cell after stimulation was calculated to be 2.66 × 10 −16 mol/s. By utilizing folic acid as a recognition element, tumor cell could be readily distinguished by BSA-Bi/PtNPs and the LOD for MCF-7 cell detection was 90 cells.
研究领域:
生物化学
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纳米医学
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分析化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Huiwen Liu,Lifen Wang,Hongfang Gao,Honglan Qi,Qiang Gao,Chengxiao Zhang
Organic nanoparticles (NPs) from donor–acceptor based coumarin derivatives, 6-[4-(N,N-diphenylamino)phenyl]-3-ethoxycarbonyl coumarin (DPA-CM), with an average size of 5.82 nm, were synthesized by a facile reprecipitation method using water as a poor solvent and tetrahydrofuran as a good solvent. Red-shifted absorption, blue-shifted photoluminescence emission, and aggregation-induced enhanced electrochemiluminescence (ECL) emission were observed for the DPA-CM NPs in aqueous solution compared with the original DPA-CM in organic solution. The aggregation-induced enhanced ECL emission is ascribed to the combined effects of the small size of the DPA-CM NPs, the restricted conformational relaxation in the NPs, and the good stability of the cationic radical of DPA-CM. A strong and stable ECL emission is obtained at the DPA-CM NPs modified glassy carbon electrode in the presence of tri-n-propylamine, and the ECL intensity of the DPA-CM NPs modified electrode is quenched linearly in the range of 0.05–50 μM with detection limit of 0.04, 0.2, and 0.4 μM for ascorbic acid, uric acid, and dopamine, respectively. This work shows an example of donor–acceptor based organic NPs as ECL emitters and their analytical applications to monitor biomolecules.
研究领域:
化学
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分析化学
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材料科学
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生物医学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 46
·26028-26035
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IF 12.732
Jingyang Xu,Pengpeng Lu,Li Wang,Yong Fan,Weijun Tian,Jianing Xu,Jie Zhao,Luquan Ren,Weihua Ming
Antifogging coatings prepared by highly hydrophilic/superhydrophilic strategies are susceptible to general oil contamination, hence readily losing their activities. Herein, a stimuli-responsive antifogging/oil-repellent coating with a delicate balance between hydrophilic and oleophobic components was prepared via a UV-assisted cross-linking method. Initially, different contents of acrylate monomers, including acrylic acid (AA), 1H,1H,2H,2H-tridecafluoro-n-octyl acrylate (TFOA), and 4-benzoylphenyl acrylate (BPA) were thermally polymerized to obtain a series of terpolymers, poly(AA-co-TFOA-co-BPA). Afterwards, poly(AA-co-TFOA-co-BPA) was covalently tethered to varied substrate surfaces (i.e., glass slides, PC, PET, and PVC) through a UV triggered anchoring of BPA. Benefiting from the delicate balance between hydrophilic poly(AA) and oleophobic poly(TFOA), the resultant coating displays solvent sensitive stimuli-responsive wettability, driven by the encountered liquids with different surface tensions. Therefore, these coatings show excellent anti-fogging ability with ∼90% light transmission, in a wide temperature range from −20 °C to 85 °C, meanwhile, the coatings also display remarkably high oil-repellence with an extremely low sliding angle for low tension liquids. These findings support the development of functional coatings that can highly maintain antifogging performances while effectively avoiding oil contamination in various imaging, medical and analytical applications.
研究领域:
材料科学
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化学工程
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表面化学
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高分子科学
✓ 已验证
产品关联
DOI
高影响因子
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