Journal of Analysis and Testing
·
2019
·Vol. 3
·期 3
·277-285
·
IF 0
Li Xinxue,Huang Qingwei,Li Wei,Zhang Jinli,Fu Yan
Abstract N -Acety-L-cysteine (NAC), enriched with multiple electron-rich groups involving –SH, –C=O, and –COOH, exhibits strong affinities to transition metal ions. Herein, NAC was adopted as the stabilizing agent to synthesize a series of peroxidase-like Pt nanoclusters (NCs) with different physicochemical properties. Both the cluster size and the charge state of NAC–Pt NCs are highly dependent upon the molar ratio of [K 2 PtCl 4 ]/[NAC], contributing to different peroxidase mimicking activities. The most active Pt nanozyme (~ 1.7 nm), composed of 60% metallic Pt 0 and 40% positively charged Pt 2+ respectively, exhibits the K m of 0.132 mM for 3,3′,5,5′-tetramethylbenzidine and 35 mM for H 2 O 2 . Based on the heparin-activated enzymatic activity of NAC–Pt at pH 6.0, an ultrasensitive test was established for quantitative determination of heparin, giving the linear response of 0.5–20 μg/mL as well as the limit of detection of 2 × 10 −3 μg/mL. This proposed method is also applicable in biological fluid for practical applications. Such a colorimetric method possesses several advantages involving high sensitivity, short response, eco-friendly synthesis, low consumption of material and energy, free of expensive instrument, as well as simple operation. Graphic abstract
研究领域:
纳米技术
·
分析化学
·
生物化学
✓ 已验证
DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Shuhui Liang,Manman He,Jingjing Guo,Jie Yue,Xipeng Pu,Bo Ge,Wenzhi Li
The BiOBr:Yb 3+ ,Er 3+ /g-C 3 N 4 (BYE/CN) p-n junction photocatalysts were successfully fabricated by a stepwise method. Experimental results show that Er 3+ /Yb 3+ were successfully doped into BiOBr lattice. As-obtained BYE/CN exhibited strong NIR light absorption and upconversion emission from NIR to UV–visible due to the upconversion transition of Er 3+ . The p-n junction was constructed due to the appropriate alignment band structure of BYE and g-C 3 N 4 , which distinctly suppresses the recombination rate of electron-hole pairs. Compared with pure BYE and CN, as-synthesized BYE/CN samples exhibit distinctly improved photoactivities under the irradiation of visible or NIR light, which can be attributed to the upconversion effect of Er 3+ and the construction of p-n junction. This result may provides a promising system for efficient harvest of the NIR light, which will contribute to the utilization of solar energy in the future.
研究领域:
材料科学
·
光催化
·
能源利用
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 20
·5651-5659
·
IF 5.726
Hossain M. Shahadat,Hussein A. Younus,Nazir Ahmad,Md. Abdur Rahaman,Zafar A. K. Khattak,Serge Zhuiykov,Francis Verpoort
Water-soluble homogeneous nickel catalysts have been rarely investigated for catalytic water oxidation as compared to their heterogeneous counterparts. Herein, we report homogenous electrochemical water oxidation by a nickel(II) complex, ([NiL](PF6)2 (L = bis(2-pyridyl-methylimidazolylidene)methane), based on a macrocyclic N-heterocyclic carbene/pyridine hybrid ligand under neutral and alkaline conditions. The catalyst displayed the stable catalytic current of 0.65 mA cm−2 at the overpotential of 0.80 V (∼0.55 V at GCE for CV) with a ∼93% Faradaic efficiency at pH 9.0 for oxygen evolution in long-term bulk electrolysis. The CV, UV-vis, ESI-MS, SEM, and EDX results demonstrated that the catalyst was impressively stable even after long-term controlled potential electrolysis (CPE) (11 h) and homogeneous in nature. The synthesis of this catalyst is straightforward, and its complex is air and moisture stable. To the best of our knowledge, this is the first study on the investigation of a Ni–NHC complex for water oxidation under aqueous conditions (acetate/phosphate). According to the literature, the role of the phosphate ion in homogenous nickel-catalysed water oxidation was found to vary from catalyst poisoning to activation. Interestingly, the catalytic activity of our catalyst in phosphate buffer was significantly higher than that with acetate ions at the same pH value; this might indicate the key role of phosphate ions as proton acceptors, which boosted the catalyst activity via enhanced PCET during catalysis.
研究领域:
无机化学
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电化学
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催化化学
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配位化学
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能源化学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2017
·
IF 4.95
Chang Wang,Yike Wu,Liang Zhang,Bi-Feng Liu,Yawei Lin,Xin Liu
Quantitative analysis of glycans is an emerging field in glycomic research. Herein we present a rapid and effective dual-labeling strategy, in the combination of isotopic derivatization of N -glycosylamine-based glycans by d0/d5-benzoyl chloride and methylamidation of sialic acids , to relatively quantify both neutral and sialylated N -glycans simultaneously by MALDI-MS. The derivatization efficiencies were increased by microwave-accelerated deglycosylation which not only largely reduce the time of glycoprotein deglycosylation but also inhibit the hydrolysis of intermediate glycosylamines produced by PNGase F digestion. Three model glycoproteins, including RNase B, bovine fetuin and IgG from human serum, were applied to validate this technique. Results showed that the glycans from microgram level of glycoprotein can be successfully quantified with high reproducibility and the whole time of analytical procedure was shortened to 4 h. Furthermore, this proposed method was applied for the comparative analysis of N -glycans from serum of healthy donors and multiple myeloma patients. It was found that five N -glycans may be as the potential biomarkers for rapid detection of early multiple myeloma, indicating the feasibility of this strategy in monitoring subtle quantitative differences of serum glycomics.
研究领域:
生物化学
·
医学诊断
·
糖组学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Xiupei Yang,Jing Xu,Na Luo,Fenglin Tang,Maoxue Zhang,Bin Zhao
Chemical doping with heteroatoms was employed to prepare N,Cl co-doped fluorescent carbon dots (N,Cl-FCDs) which may be designed for the detection of tartrazine. Using urea as the N source and FeCl 3 · 6H 2 O as the Cl source, N,Cl-FCDs were synthesized by hydrothermal method with carbon dots prepared from aloe. Compared with pure carbon dots (CDs), N,Cl-FCDs resulted in dramatic improvement in the fluorescence properties and surface physical chemical properties. The fluorescence quantum yield of the N,Cl-FCDs was as high as 60.52%. As an effective fluorescence probe for tartrazine, a good linear relationship between N,Cl-FCDs and tartrazine was constructed at the concentration range from 0.1 to 30 μM with a detection limit of 48 nM based on the mechanism of fluorescence resonance energy transfer (FRET). The proposed fluorescent probe method was successfully applied to detect tartrazine in beverages, which is expected to have a potential application in the field of food analysis.
研究领域:
食品科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Yu Lu,Lujia Sun,Cheng Li,Xiaoqin Wang,Wenqing Li,Tong Zhao,Linjuan Huang,Zhongfu Wang
Extensive cross-allergic reactivity exists among food-borne plants. As most allergens are glycoproteins, protein sensitization has been extensively studied. However, little attention has been given to the glycan component of glycoproteins. Here, we qualitatively and quantitatively compared the N -glycans of eight cross-reactive plant glycoproteins derived from peach pollen, soy, pine nut, cashew nut, pistachio, walnut, almond, and hazelnut. Cross-reactive carbohydrate determinants (CCDs) were widely present in the allergic glycoproteins according to the following order: pollen > soybean > pistachios > pine nuts > walnuts > cashews > hazelnuts > almonds. The N -glycan structure presented clear differences between the germplasm and vegetative tissue. Importantly, fucosylation and xylosylation levels correlated positively with extensive cross-reactivity between plants, which suggests that CCDs may be one of the causes of cross-allergy. This result provides the foundation for mechanistic studies on plant-derived CCDs as a source of food cross-allergies.
研究领域:
生物化学
·
免疫学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Qingsong Luo,Yu Wan,Zhenxing Wang,Shuang Gao,Yan Chen,Changhao Feng
In the field of environmental monitoring, metal oxide semiconductor (MOS)-based gas sensors demonstrate significant advantages in detecting volatile organic compounds (VOCs) in ambient air. Gas sensors based on Yttrium-doped Zinc Ferrite nanofibers (Y-doped ZFO NFs) are fabricated via a conventional electrospinning method, with varying molar ratios of Y/Zn (0 at%, 2 at%, 4 at%, and 6 at%). Here, the doping of rare earth element Y significantly enhances the gas sensing performances. The structural and morphological information of both pristine ZFO and Y-doped ZFO NFs have been characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and Transmission electron microscope (TEM). Compared with pure ZFO, the 4 at% Y-doped ZFO (S3) exhibits a 4.46-fold higher response (R a /R g = 43.1) to 100 ppm n-butanol at 150℃ with a fast response time of 11 s. Additionally, the Y-doped ZFO NFs gas sensors exhibit outstanding selectivity, remarkable long-term stability, and a low limit of detection (LOD) attributed to their small grain size, porous and rough morphology, abundant oxygen vacancies, and the formation of n-n heterojunctions.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Ya-Nan Zhang,Shuai Feng,Shi-Hua Zhao,Bo-Wen Gao,Cheng-Xiang Wang
Perovskite solar cells (PSCs) have emerged as a leading photovoltaic technology due to their high efficiency and low cost. Even though they have developed rapidly since their inception, with efficiencies of over 26%, inverted PSCs face challenges such as nonradiative recombination and ion migration. Surface treatment, especially the utilization of organic compounds, has improved efficiency and stability by optimizing the perovskite–charge transport layer interface. Herein, we report a facile and effective strategy by introducing 2,2′-bipyridyl to modify the surface of perovskite, achieving a power conversion efficiency of 24.43% with increasing open-circuit voltage and fill factor and good repeatability on multiple devices. We reveal that the 2,2′-bipyridyl molecule can chelate lead ions on the surface of perovskite, effectively suppressing nonradiative recombination. Furthermore, this modification can induce surficial n-doping to refine the energy level alignment, thereby minimizing charge transport losses. Additionally, the device maintained over 92% of the initial efficiency after 1000 h of operation at the maximum power point under continuous illumination. This surface chelation and defect passivation strategy employing 2,2′-bipyridyl offers a promising avenue for exploring the details of potential long-term degradation mechanisms and the development of commercially viable high-performance p-i-n PSCs.
研究领域:
材料科学
·
光伏技术
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
ENZYME AND MICROBIAL TECHNOLOGY
·
2022
·
IF 3.705
Shi-Wei Zhao,Qian Zhou,Neng-Bing Long,Rui-Feng Zhang
A novel polymer support was prepared by curing of epoxy resin in ethanol solution in the macropores of a melamine sponge. The produced polymer gel could uniformly deposit on the surface of melamine in either porous or nonporous morphology. The composite sponge with porous coating can be used as a large-sized and well-mass transferred support for the immobilization of β-galactosidase from Bacillus circulans through method of adsorption and crosslinking, and a column reactor was made for the preparation of N-acetyllactosamine in a sealed circulation way. The porosity and specific surface area of the support were 91.6 % and 46 m 2 /g, respectively. The loading amount and the specific activity of immobilized β-galactosidase under the optimal immobilization conditions were 41.2 mg/g support and 16.5 U/mg protein , respectively. In the biosynthesis of N-acetyllactosamine lactose and N-acetylglucosamine were used as donor and acceptor, respectively. Under optimized conditions the N-acetyllactosamine yield reached 54 % within 150 min at 50 °C. After 10 cycles, the immobilized β-galactosidase retained 70 % of the original activity.
研究领域:
生物化学
·
酶工程
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 22
·e202200715
·
IF 4.782
Wei-Xiang Cheng,Yi-Zhao Chen,Song-Yi Liao,Jun-Qi Hu,Cun-Sheng Liu,Shuai-Fu Cui,Xing-Wen Huang,Yidong Liu,Yonggang Min
Graphical NIB news : MoS 2 anchored on nitrogen-doped MXene nanosheets with carbon coating were prepared and applied in Na-ion batteries (NIBs). It remained at ∼308 mAh g −1 at 0.5 A g −1 after 300 cycles and showed higher rate performance of ∼189 mAh g −1 at 4 A g −1 . The MoS 2 @N-MXene/C heterogeneous nanosheets showed enhanced pseudocapacitance effects of 84.5 % at a scan rate of 2 mV s −1 according to CV curves simulation. Currently, Na-ion batteries (NIBs) have emerged as a new generation of energy storage devices. However, due to the lack of suitable anode materials, the large-scale practical application of NIBs is still greatly limited. Therefore, to address this issue, an effective strategy towards an advanced NIBs anode was developed by achieving MoS 2 anchored on nitrogen-doped MXene nanosheets with carbon coating (shorten as MoS 2 @N-MXene/C). The structure, surface chemistry state and micromorphology of MoS 2 @N-MXene/C were carefully analyzed and characterized by XRD, XPS and SEM/TEM, respectively. It was shown that MoS 2 was loaded on N-MXene to form a heterogeneous nanosheets structure. When applied to the anode of NIBs, MoS 2 @N-MXene/C delivered ∼189 mAh g −1 at 4 A g −1 and remained at ∼308 mAh g −1 after 300 cycles at 0.5 A g −1 . Moreover, based on the simulation and calculation from CV curves, the enhanced electrochemical performances of MoS 2 @N-MXene/C was assigned to its high pseudocapacitance-dominated contribution (84.5 % at a scan rate of 2 mV s −1 ). Therefore, owing to the highly conductive N-MXene and the actively anchored MoS 2 , MoS 2 @N-MXene/C could effectively provide efficient channels for charge transfer and ionic diffusion. The presented design strategy may provide a guidance for developing more-efficient NIBs anode.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Haoran Sun,Wanzhong Yin,Bin Yang,Keqiang Chen,Qiuyue Sheng
The flotation performances of magnesite and quartz were investigated in this work using N-hexadecyltrimethylammonium chloride (HTAC) as a collector. Micro-flotation tests were performed in a pilot study, and the results demonstrated that HTAC had high selective collection ability to quartz. Further, batch flotation results showed that HTAC could effectively remove quartz from magnesium-bearing carbonate ores. The adsorption behaviors of HTAC onto the surfaces of two minerals were analyzed through zeta-potential measurements and X-ray photoelectron spectroscopy (XPS) detection, which revealed that HTAC was mainly adsorbed on quartz rather than magnesite. Thus, HTAC could be used as a high-selectivity collector to efficiently separate magnesite from quartz.
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 8
·45907
·
IF 1.86
Ge Shu,Chong Zhang,Yuda Li,Jia-Xing Jiang,Xunchang Wang,Hui Li,Feng Wang
Novel hypercrosslinked microporous organic polymers (MOPs) derived from N-functionalized siloles as basic building units have been designed and synthesized via Friedel–Crafts alkylation reaction. The resulting N-functional silole-containing polymer networks exhibit high thermal stabilities and moderate Brunauer–Emmett–Teller surface area ranging from 666 to 1137 m 2 g −1 . The incorporation of carbazole or triphenylamine moieties into the polymer skeleton increases the number of electron donating basic nitrogen sites in the porous frameworks. Thus, the corresponding polymer PDMCzS shows enhanced CO 2 adsorption capacities of 3.23 mmol g −1 at 273 K and 1.13 bar, and higher CO 2 /N 2 selectivity (43.99) at 273 K than the analogous silole-containing polymers P1–P3. These results demonstrated that the N-functionalized silole-containing polymer network is a very promising candidate for potential applications in post-combustion CO 2 capture and sequestration. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45907.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）