EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Wenjing He,Yuhuan Xu,Heng Xu,Jiajia Du,Junlei Wang,Ya Wang,Zhongli Wu
Rapid, portable, and sensitive detection of Zn 2+ is crucial for human health. In this study, SA/PEG/Ln fluorescent hydrogels were synthesized via in situ polymerization with lanthanide metals (Tb 3+ /Dy 3+ ) and PAM. The results demonstrated a significant improvement in mechanical properties (132.8 % increase in compressive properties) after rare earth doping. The addition of Dy 3+ enhanced the fluorescence properties of the singly doped Tb 3+ fluorescent hydrogel (maximum luminous intensity increased by 1900 cd). Monitoring changes in fluorescence intensity enabled the realization of Zn 2+ detection, allowing for quick and accurate determination of zinc ion presence. Visual monitoring of Zn 2+ was achieved with the assistance of a portable ultraviolet lamp.
研究领域:
生物材料学
·
分析化学
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DOI
高影响因子
OPTIK
·
2022
·
IF 2.84
Wei Shuangjiao,Bian Zhenglan,Wang Xingquan,Miao Xiaokang,Zhang Guilin,Xue Liang,Hu Anduo,Li Gaofang,Chu Fenghong
Pt-doped WO 3 materials have good hydrogen-sensing properties, which are widely used in the field of hydrogen sensing. In this paper, Sol-Gel method is used to prepare WO 3 /Pt sensing material and sensing characteristic to hydrogen is characterized by transmission optical fiber hydrogen sensing system fabricated at home. By optimizing the fabrication parameters including sol-gel viscosity, aging time, Pt:W moral ratio and layers of the sensing film, the sensitivity and repeatability of the film were greatly improved. The repeatability of the film is further improved by irradiating the film with an UV lamp. Experimental results show that by increasing the number of film layers from one to five (the thickness of the film is about 222 nm, and the content of Pt element is 13.47% by SEM test), the sensitivity increased by 1.666 times. The repeatability of the film can be improved by 3% through the irradiation of the ultraviolet lamp. The optimized WO 3 /Pt film was tested continuously for 12 times at 5% hydrogen concentration, and the zero drift was only 0.723%.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
Journal of Ocean University of China
·
2023
·Vol. 22
·期 2
·469-478
·
IF 1.6
Mei Xueqiao,Li Chunhu
Photocatalyst Ag/ZnO-TiO 2 was prepared by template method. The catalyst was characterized by XRD, SEM, and UV-vis DRS. Rhodamine B (RhB) and target pollutants were used to evaluate the photocatalytic performance of the catalyst under 40 W UV-lamp. The photocatalytic degradation mechanism of Rhodamine B was discussed through free radical quenching experiment. The experimental results show that hexagonal ZnO-TiO 2 can be successfully prepared by template method, and nano Ag particles are evenly loaded on the catalyst. Under the reaction conditions of 1% catalyst input and 40 W UV-lamp, the catalytic degradation rate of RhB by Ag/ZnO-TiO 2 was 98.28%. The photocatalytic degradation mechanism of Ag/ZnO-TiO 2 was explored by free radical quenching experiment. The experimental results show that H + and ·OH play a major role in the photocatalytic degradation of RhB by Ag/ZnO-TiO 2 .
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Yubin Su,Yao Lin,Tian Ren,Yuanyuan Li,Yurong Deng,Chengbin Zheng
A simple solid phase photothermo-induced chemical vapor generation (SP-PT-CVG) is described and used as an environmentally friendly desorption method for the sensitive determination of mercury in water by direct immersion solid phase microextraction (DI-SPME) atomic fluorescence spectrometry (AFS). A DI-SPME array equipped with 20 nano-TiO2-coated tungsten fibers was employed to simultaneously preconcentrate mercury from 20 samples, enabling an extraction throughput of 40 samples per hour. Subsequently, the fibers were drawn from the sample solutions and inserted into an inner tube sealed in a specially designed UV lamp in turn for SP-PT-CVG to generate Hg0, which was swept to an AFS detector for its detection. It is worth noting that the tube served as both a vapor generator and a desorption chamber. This proof-of-concept study confirms the feasibility of solid phase CVG. Compared to conventional CVG carried out in the liquid phase, solid phase CVG not only retains the advantages of conventional CVG but also alleviates the matrix interference on vapor generation and preconcentrates analyte prior to vapor generation, improving analytical performance for liquid state samples. DI-SPME-SP-PT-CVG-AFS provides a limit of detection of 2.3 ng L–1 for mercury determination by AFS. In the proposed method, the combination of DI-SPME and SP-PT-CVG eliminates the tedious derivatization steps required in conventional headspace SPME, thus minimizing toxic reagent consumption and improving extraction throughput. The practicality of DI-SPME-SP-PT-CVG-AFS was evaluated by analyzing two different certified reference materials and river water samples with good spike recoveries (98–107%).
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2017
·
IF 0.795
Xiang QIAN,Qian ZHANG,Xin-Qiong LU,Quan YU,Kai NI,Chao ZHANG,Xiao-Hao WANG
An electrospray/ultraviolet lamp dual-source ion trap mass spectrometer was developed for the rapid detection of gas and liquid samples. A discontinuous atmospheric pressure sampling system was used in the instrument, in which both the electrospray ions and gaseous analytes were sampled and transferred by a pinch valve device. The two ionization sources used here were generally suitable for different kinds of analytes and provide complementary applications. Electrospray was used for the ionization of polar compounds in solution, while the UV ionization source was mainly applied to the analysis of gaseous organic compounds. A variety of samples such as anisole, toluene, 2,4-dimethylaniline, arginine, reserpine and aspartame were employed to test the performance in different working mode of the instrument. The result showed that the two sources was suitable for ionization of different samples, and different types of molecular ions were generated when analyzing 2,4-dimethylaniline. Two ionization sources could be used alternately or simultaneously without interference with the other and the working mode could also be switched to fit the application requirements. Dual-source configuration was an effective way to extend the applications for miniature mass spectrometers. It did not significantly increase the size of the instrument, but provided more versatile analysis to meet the need for the measurement of different types of samples.
研究领域:
分析化学
·
质谱技术
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 5
·816-820
·
IF 1.063
Chu Ning,Xu Shuping,Xu Weiqing
Two different kinds of configurations of 1,4-bis[2-(4-pyridyl)ethenyl]-benzene( trans -bpeb and cis -bpeb) were achieved, and a bpeb dimer was synthesized in dimethyl sulfoxide(DMSO). Compared with the previous work that synthesized the bpeb dimer or polymer in crystal with a template agent needed, the reaction occurred in a solution phase in the present method. A hand-held ultraviolet lamp(365 nm) with the power of 12 W and the Watt density of 0.35 mW/cm 2 can realize the photodimerization of bpeb, instead of the high-power mercury lamp in most previous studies. Unlike other 2+2 cycloaddition in liquid state using catalysts even noble metals, no catalysts were required here, which is cost-saving. Only the trans -pbeb can start the cycloaddition and the formation of the close J-aggregations of trans -pbeb in DMSO is a precondition for explaining the 2+2 photodimerization. The productivity for the 2+2 cycloaddition product was achieved as 55.6%.
研究领域:
有机化学
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光化学
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超分子化学
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材料化学
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合成方法学
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Chunhua Lin,Zhifeng Zou,Zhiwei Lei,Li Wang,Yonghai Song
Ellagic acid (EA) is a symmetric natural phenol bioactive compound present in fruits and nuts, and has attracted substantial interest worldwide owing to its beneficial health effects. Here, the exploration of luminescent metal-organic frameworks (MOFs) of MIL-101(Al)-NH 2 (MIL = Materials of Institute Lavoisier) for rapid and sensitive sensing of EA in aqueous solution was reported initially. The porous MIL-101(Al)-NH 2 MOFs was synthesized by solvent-thermal method with inexpensive 2-aminoterephthalic acid and aluminum salt, which exhibited uniform spherical crystals (~340 nm) and specific mesoporous structure (3.2 nm). The fluorescence intensity of MIL-101(Al)-NH 2 at 425 nm showed a good linear relationship with EA concentration in the range of 0.15–100 μM. The detection limit was as low as 43.8 nM, the rapid response time was within 2 min, and the cost of detection was low. In addition, the “turn off” fluorescence probe could be utilized for visual detection of EA according to the color change under the UV lamp. Based on the Stern-Volmer equation, the quenching constants was decreased with the rise of temperature, which indicated that the probable quenching mechanism was static quenching. The nanoprobe was successfully used to detect EA in the cherry and serum samples. MIL-101(Al)-NH 2 represents the first instance of MOFs-based fluorescent probe in EA detection. This work not only enriches the detection method of EA, but also expands the potential application of MIL MOFs in small molecules.
研究领域:
分析化学
·
材料科学
·
生物化学
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DOI
PubMed
高影响因子
FOOD CONTROL
·
2022
·
IF 6.652
Gaozhen Li,Fukai Guan,Shancang Zhao,Huihui Xu,Jiashuai Sun,Jingcheng Huang,Qingqing Yang,Yanyin Guo,Xia Sun,Yemin Guo
As an organochlorine pesticide, procymidone has become an increasing serious problem in vegetables in recent years. In order to solve a series of problems such as low sensitivity of the immunological methods, a time-resolved fluorescent immunoassay strip (TRFIAS) was developed with low limit of detection (LOD). Based on the principle of antigen-antibody immune competition, TRFIAS could detect procymidone in vegetables. After the targets being added, the samples were incubated at 37°C for 10 min. TRFIAS was observed under a UV lamp of 365 nm. The results were processed by ImageJ software to complete the qualitative and quantitative analysis of TRFIAS. Under the optimal working conditions, a linear range of TRFIAS was 5–250 ng/mL with a LOD of 0.33 ng/mL and a visual limit of detection (VDL) of 50 ng/mL. And the TRFIAS had good specificity, precision and accuracy. Comparing the results of TRFIAS with those of ultrahigh-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS), the two assays were in good agreement. Therefore, TRFIAS has the advantages of high sensitivity, high specificity, simple operation and relatively short assay time. Meanwhile, it shows absolutely great advantages in both quantitative and qualitative analysis.
研究领域:
农业化学
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分析化学
·
食品科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jinjie Hou,Pei Jia,Kairong Yang,Tong Bu,Shuang Zhao,Longwen Li,Li Wang
As a special heavy metal ion, copper ions (Cu2+) play an indispensable role in the fields of environmental protection and safety. Their excessive intake not only easily leads to diseases but also affects human health. Therefore, it is particularly important to construct a facile, effective, and highly selective Cu2+ probe. Herein, a novel Zr–tetraphenylporphyrin tetrasulfonic acid hydrate (TPPS) metal–organic framework (ZTM) was fabricated using TPPS as the ligand and exhibited strong red fluorescence with a high quantum yield of 12.22%. In addition, we designed a ratiometric fluorescent probe by introducing green fluorescein isothiocyanate (FITC), which was not subject to environmental interference and had high accuracy. When exposed to different amounts of Cu2+, the fluorescence emission at 667 nm from ZTMs is remarkably quenched, while that at 515 nm from FITC is enhanced, accompanied by a change in the solutions’ fluorescence color from red to green under a UV lamp. Besides, the ZTMs solutions display an excellent ratiometric colorimetric response for Cu2+ and produce an obvious color change (from green to colorless) that is visible to the naked eye. The fabricated ZTMs@FITC fluorescent probe exhibits distinguished performance for Cu2+ detection with linear ranges of 0.1 to 5 μM and 5 to 50 μM, as well as a low detection limit of 5.61 nM. Moreover, a colorimetric sensor based on ZTMs exhibits a good linear range from 0.1 to 20 μM for Cu2+ with the detection limit of 4.96 nM. Furthermore, the dual-signal ratiometric sensor has significant specificity for Cu2+ and is successfully applied for monitoring Cu2+ in water samples, which proves its practical application value in the environment and biological systems.
研究领域:
环境科学
·
分析化学
·
材料科学
·
传感器
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Xiaowei Mu,Xiaona Song,Dejiang Gao,Pinyi Ma,Qiong Wu,Daqian Song
Herein, a novel type of red-emitting carbon dots called TN-CDs was created via a one-step hydrothermal approach using neutral red and tartaric acid as raw materials. The fluorescence of TN-CDs was gradually quenched as the amount of water increased, and the color of the solution changed from yellow to pink mauve (or purple to pink). The reaction could be completed within only 5 s in various organic solvents such as N,N-Dimethylformamide (DMF), methanol (MeOH), acetonitrile (ACN), and ethanol (EtOH) with linear detection ranges of 1.2%–35.0%, 0.5%–20.0%, 0.25%–5.0% and 0%–16.0%, respectively. In addition, we prepared a reusable test strip and then combined it with TN-CDs to detect water content in DMF, as well as integrated it with smartphone software, a UV lamp, and a dark chamber for real-time, on-site, visual quantitative detection of the water content.
研究领域:
分析化学
·
材料科学
·
环境科学
·
化工工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2023
·
IF 6.1
Shuxian Li,Weihua Liu,Minxuan Liu,Yuyang Chen,Fuyuan Zhang,Xianghong Wang
Ceftiofur (CEF) is an antimicrobial agent with high efficiency and low toxicity, desfuroylceftiofur is its main metabolite, but they are also have potential harm to human health. In this study, ceftiofur was combined with carrier proteins to get artificial antigens. A specific antibody (pAb) against CEF and desfuroylceftiofur was prepared. A sensitive and rapid paper-based sensor relying on time-resolved fluorescent microspheres (TRFMs) immune probes was developed, which were time-resolved fluorescent immunochromatographic strips (TRFMs-LFIA). The concentrations of T line and C line, activated pH, antibody volume and probe volume were optimized. Quantitative limits of detection (qLODs) of TRFMs-LFIA for CEF and desfuroylceftiofur were 0.97 ng/mL and 0.41 ng/mL, respectively. And 50 % inhibiting concentrations (IC 50 ) were 12.92 ng/mL and 12.58 ng/mL, respectively. Pretreatment procedures of real samples were simple and rapid. Detection time of TRFMs-LFIA strip was 15 min. Qualitative analysis of CEF and desfuroylceftiofur was achieved under a UV light, quantitative analysis was implemented with a fluorescent immunoassay analyzer. The average recovery rates ranged from 91.4 % to 107.7 % and corresponding coefficients of variation (CV) was 1.5%–9.7 %. Concentration levels of artificially-spiked samples were measured by TRFMs-LFIA and compared with detection results of High performance liquid chromatography (HPLC), which showed a good accordance. These results indicated that the proposed assay can provide an effective strategy for on-site detection of CEF and desfuroylceftiofur simultaneously.
研究领域:
分析化学
·
免疫学
·
药学
·
食品安全
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 98
·95469-95475
·
IF 3.289
Lingli Bu,Jingdong Peng,Huanjun Peng,Shaopu Liu,Huan Xiao,Dan Liu,Ziyu Pan,Yu Chen,Fang Chen,Yan He
Chromium(VI) is proved to be highly carcinogenic and mutagenic, thus sensitive and rapid sensors for monitoring Cr(VI) are in urgent demand. In this work, a facile fluorescent assay for the sensitive and selective detection of Cr(VI) was proposed based on static quenching combined with inner filter effect (IFE) using phosphate functionalized carbon dots (PCDs) as nanoprobes. A good linear quenching was observed in the range of 1.0–400 μM with a detection limit of 0.24 μM (σ/S = 3) under the optimized conditions. The nanoprobe was employed for detecting Cr(VI) in real water samples including river water and tap water with satisfactory recovery. Moreover, with the addition of Cr(VI), the color changes of PCDs can be easily observed by the naked eye under a UV lamp. Based on this, Cr(VI) test papers were fabricated for spot quick detection of Cr(VI).
研究领域:
分析化学
·
环境科学
·
纳米技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）