FOOD CHEMISTRY
·
2023
·
IF 8.8
Yijian Zhao,Meiyi Liu,Shuai Zhou,Zhiyu Yan,Jingsheng Tian,Qiaojuan Zhang,Zhiyi Yao
Accurate on-site analysis of tetracycline (TC) is of great research value for ensuring food safety and estimating environmental pollution. Herein, a smartphone-based fluorescent platform for TC detectionhas been developed based on a europium functionalized metal–organic framework (Zr-MOF/Cit-Eu). Based on the inner filter and antenna effect between Zr-MOF/Cit-Eu and TC, the probe exhibited a ratiometric fluorescent response toward TC, resulting in an emission color change from blue to red. Excellent sensing performance was achieved with a detection limit of 3.9 nM, consistent with the linear operation spanning nearly four orders of magnitude. Subsequently, visual test strips based on Zr-MOF/Cit-Eu were prepared, possessing the potential for accurate testing of TC via RGB signals. Finally, the proposed platform was well applied in actual samples with satisfied recoveries (92.27 to 110.22%). This MOF-based on-site fluorescent platform holds great potential on constructing intelligent platform for visual and quantitative detection of organic contaminants.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Yulin Wang,Libo Nie,Yongbiao Hua,Liang Gong,Xiuzhen Qiu,Huishi Guo
In this work, a ratiometric fluorometric sensor based on nickel nanoclusters (NiNCs)-europium complex (NiNCs-Eu 3+ ) was constructed for the highly selectivity detection of tetracyclines (TCs) in water samples. In the presence of TCs, the blue fluorescence of the sensor NiNCs-Eu 3+ was quenched at 430 nm and the characteristic red fluorescence of Eu 3+ -TCs appeared at 620 nm because of the combined help of inner filter effect (IFE) and antenna effect. Under the optimized conditions (100 mM Eu 3+ (100 µL); temperature (25℃); reaction time (10 min), HEPES buffer solution (pH = 7.0)), the sensor offered a wide detection range of tetracycline (TC) and oxytetracycline (OTC) from 0.1 to 50 μM with the detection limit (LOD) of 25 nM and 21 nM, respectively. Moreover, the sensor was able to detect of TC and OTC in tap and lake water with high recovery rate (89.10%-97.60%). In addition, the portable paper-based sensor was constructed using filter paper embedded with NiNCs-Eu 3+ . The distinct fluorescent color of the paper-based sensor varied from bright blue to red against different concentrations of TC and OTC. These above findings demonstrated the potential for wide application of as-prepared ratio metric fluorescence sensor for visual detection of TCs in water samples.
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 33
·11924-11930
·
IF 8.067
Yuan Wang,Guangmin Xie,Jinglei Chen,Xiurong Zhang,Cong Chen,Jian Yin,Huanrong Li
Visible light as an excitation source is much more accessible than ultraviolet light, but the synthesis of lanthanide complex (LnC) films with visible-light excitation and high photoluminescence quantum yield (PLQY) is still a challenge. We report herein a visible light excitable and highly luminescent film by incorporation of a europium(III) (Eu3+) tetrakis(β-diketonate) complex with tetraphenylphosphonium as a counterion into a polymethyl methacrylate (PMMA) matrix. Excellent compatibility between the complex and PMMA was observed, resulting in the PMMA film with an 80 wt% loading content of the complex exhibiting a PLQY of up to 62.5% and a high transparency of ∼89%. As a proof-of-concept experiment, the luminescent film was used to fabricate luminescent solar concentrators (LSCs), in which the strong luminescence effect of the luminescent film is responsible for its optical conversion efficiency of 1.46% with a G of 1.87. This study presents a new model system for the development of highly transparent LSCs by utilizing high loading contents of LnCs.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Haijuan Gao,Dongxu Cui,Junning Kou,Honglei Zhao,Chunyi Sun,Xinlong Wang,Zhongmin Su
Herein, we reported a pair of di-nuclear europium enantiomers [Eu 2 (PO 4 ) 6 (R-/S-HL) 6 (MeOH) 4 ]•2MeOH (R-complex( 1a ) and S-complex( 1b )) constructed from chiral ligands (R)-/(S)-(+)-1,1′-binaphthyl-2,2′-diyl hydrogenphosphate (R-/S-HL) and europium (III) nitrate by solvothermal method. The structure of the complexes was characterized by single-crystal X-ray diffraction, powder X-ray diffraction and Fourier transform infrared spectroscopy. It was found that R-complex( 1a ) and S-complex( 1b ) were chiral enantiomers with a zero-dimensional chiral cluster structure. The circular dichroism studies further revealed the chiral properties of R-complex( 1a ) and S-complex( 1b ). Moreover, fluorescence sensing tests demonstrated that R-complex( 1a ) and S-complex( 1b ) possessed high enantioselectivity for axially chiral BINOL racemates.
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TALANTA
·
2021
·
IF 6.057
Yicheng Wang,Dongliang Yang,Yaqin Hu,Yuxin Wang,Wen Jing Yang,Lianhui Wang
Lanthanide nanoprobes have attracted extensive attention for applications in cellular imaging and biological sensing. Herein, water-dispersible europium (III)-based (Eu(III)-based) nanoprobes were prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization-induced self-assembly (PISA) of hydrophobic monomers (Eu(III)-containing monomer and methyl methacrylate (MMA)) using hydrophilic macro-chain transfer agent poly(PEGMA)-CTA. The resulted poly(PMEu) nanoprobes showed spherical in shape in good monodispersity with average diameters of around 210 nm. The poly(PMEu) nanoprobles excellent aqueous dispersity, high aqueous stability and good luminescence properties with quantum yields of 37.21% and fluorescence lifetime of 312.4 μs. Moreover, the poly(PMEu) nanoprobes exhibited good cellular biocompatibility with cell viabilities of 88.2% and high fluorescence intensity for in vitro cellular imaging. The present approach provides a facile strategy for fabrication of luminescent Eu(III)-based nanoprobes with great potential applications for biological imaging.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Qiuyan Li,Mingxia Sun,Yingying Su,Kexin Zhang,Yi Lv
Chemiluminescence (CL) was a recognized excellent analytical method for SO 3 2− . Designing a CL sensing platform not only with selectivity but also with high sensitivity is of great significance for the SO 3 2− detection in complex samples. Herein, a novel chemiluminescence resonance energy transfer (CRET) strategy was designed by doping europium (Eu) into CeO 2 NPs. On the interface of Eu/CeO 2 , SO 3 2− was oxidized to generate the high-energy intermediate SO 2 * and the energy released was absorbed by Eu/CeO 2 nanoparticles to realize CRET. The energy donor (SO 2 * generated by the reaction of Eu/CeO 2 nanoparticles and HSO 3 - ) and the receptor (Eu/CeO 2 nanoparticles) are assembled together which simplifies system and improves the energy efficiency. The CRET system with rapid response (1 s) and high sensitivity (0.007 μM) was successfully exploited for the selective detection of SO 3 2− even in PM 2.5 samples. The study provides a new clue to design simple CL sensors with high selectivity and high sensitivity.
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TALANTA
·
2021
·
IF 6.057
Yu Liang,Yuan Yan,Hong Yan Zou,Tong Yang,Shu Jun Zhen,Chun Mei Li,Cheng Zhi Huang
Excess free copper in serum has been identified to induce neurodegenerative diseases such as Alzheimer's disease, thus it is very important to determine copper (II) ions (Cu 2+ ) content for human health test. Herein we developed a point-of-care testing (POCT) platform through a luminescence “on-off” recognition mechanism of serum copper. Microsized europium coordination polymer particles (Eu-CPs), which was prepared with citric acid (CA) and europium nitrate hexahydrate through a hydrothermal route, were then successfully loaded with the mixture of 2,6-pyridinedicarboxylic acid (DPA) and poly(vinyl alcohol) (PVA) to form electrospun nanofibrous films (ENFFs). The as-prepared Eu-CPs/DPA/PVA ENFFs exhibited red emission at 618 nm when exciting at 280 nm, with the quantum yields of 22.2% owing to the antenna effect from DPA to Eu 3+ . Furthermore, the strong luminescence could be selectively quenched by Cu 2+ through coordination with DPA to interrupt the antenna effect. With that, Cu 2+ was successfully detected in the range of 2–45 μM with a detection of limit of 1.3 μM, well matching with the requirement of clinic test of excess free copper induced neurodegenerative diseases. As a proof of concept at last, this POCT platform was used to detect free copper in spiked serum samples with a recovery of 101.1%–105.2%, demonstrating that this platform provides significant potential for use in clinical test.
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ACS Omega
·
2019
·
IF 2.584
Simin Cui,Xianglei He,Dan Wang,Jie-Xin Wang,Yuan Pu,Jian-Feng Chen
The ideal product of rare-earth-doped phosphors should have uniform particle size distribution and homogeneous doping ions in each particle, and therefore, intensified micromixing at mesoscale is highly required. In this article, inspired by the concept of “mesoscience”, we demonstrate the tuning of Eu3+ doping in GdBO3 microparticles at mesoscale by a high-gravity-assisted reactive precipitation-coupled calcination process. The high-gravity environment and tiny droplets generated by the high-gravity rotating packed bed (RPB) reactor lead to significant intensification of mass transfer and micromixing, which are beneficial for the homogeneous doping of Eu3+ in the host material during reactive precipitation in liquid solution. Under excitation at 395 nm, the emission spectra of the Eu3+-doped phosphors exhibit a narrow-band red emission centered at 625 nm and the highest intensity was observed at x = 0.2. The RPB products show higher intensity than that of the control group even when the reaction time was shortened to 1/6. After calculation, the quenching in the sample most likely results from dipole–dipole interactions. The chromaticity coordinates for the RPB sample was measured as (0.598, 0.341) with a quantum yield of up to 78.11%, and the phosphors exhibit good thermal stability at 423 K. The phosphors were used as the luminescent materials for light-emitting diodes (LEDs), and the devices showed good performance. Our preliminary study illustrated that high-gravity-assisted approaches are promising for tuning the doping of rare-earth ions in microparticles at mesoscale toward efficient production of phosphors for LEDs.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 21
·8315-8324
·
IF 3.069
Hui Yang,Rui Wang,Yaozu Wang,Jianzhong Jiang,Xingzhong Guo
Macroporous europium-doped Ca12Al14O33 (C12A7:Eu3+) was prepared via a sol–gel method followed by heat-treatment, and the crystal structure, luminescence performance and metal ion luminescence sensing of C12A7:Eu3+ were investigated and evaluated in detail. The process of the sol–gel method and heat-treatment promotes the formation of a single mayenite phase C12A7:Eu3+, and the Eu3+ ions are incorporated into the crystal lattice and replace the position of the Ca2+ ions without destroying the lattice structure of C12A7. The interconnected macropores not only increase the lighting area but also reduce the concentration quenching effect, leading to a significant enhance of luminescence intensity. The resultant macroporous C12A7:Eu3+ can be used as a luminescence performance sensor and displays the potential practical application for metal ion detection. The macroporous C12A7:Eu3+ sensor has a good response to Pb2+ ions, whose linear equation between concentration (CPb) and luminescence intensity (F) of (F0 − F)/F0 = 1.412 + 0.3428 log10(CPb) can be obtained.
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Toxins
·
2019
·Vol. 11
·期 10
·605
·
IF 3.895
Erjing Chen,Ying Xu,Biao Ma,Haifeng Cui,Chuanxin Sun,Mingzhou Zhang
A fluorescent immunochromatographic test strip (FICTS) based on the use of europium nanoparticles (EuNPs) was developed and applied to detect citrinin (CIT) inMonascusfermented food. The sensitivity of the immunoassay to detect CIT was greatly improved by the use of a specific monoclonal antibody to attach EuNPs to form a probe. Under optimum conditions, the visual detection limit was 2.5 ng/mL, and the detection limit of the instrument was 0.05 ng/mL. According to the results, the IC50was 0.4 ng/mL. Matrix interference from variousMonascusfermented foods was investigated in food sample detection. The immunosensor also demonstrated high recoveries (86.8–113.0%) and low relative standard deviations (RSDs) (1.8–15.3%) when testing spikedMonascusfermented food. The detection results of this method showed a good correlation (R2> 0.98) with high-performance liquid chromatography (HPLC). The results showed that the FICTS method could be used as a rapid, sensitive method to detect CIT inMonascusfermented food.Keywords:Citrinin;Fluorescent immunochromatographic assay;Europium nanoparticles;Monascusfermented foodKey Contribution:In this study, the developed FICTS method greatly improved the sensitivity of detecting CIT inMonascusfermented food.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 7
·1-10
·
IF 5.479
Lin Bixia,Zhang Tingyun,Xin Xiaolan,Wu Duo,Huang Yan,Liu Yawen,Cao Yujuan,Guo Manli,Yu Ying
Silicon nanoparticles (SiNPs) modified with Eu(III) were synthesized and are shown to be a viable ratiometric fluorescent probe for tetracycline antibiotics. SiNPs/Eu under 405 nm excitation display two emissions, viz. a strong cyan colored fluorescence peaking at 497 nm and a weak pink fluorescence peaking at 622 nm. On addition of tetracyclines (chlortetracycline, tetracycline, doxycycline), the fluorescence at 497 nm is reduced, while the one at 622 nm is increased. Thus, the visible color of fluorescence changes from cyan to pink. This was exploited to design ratiometric fluorometric method for detecting tetracyclines. The method has a limit of detection that is lower by a factor of about 1000 when compared to the use of SiNPs only. A test paper was prepared with the SiNPs/Eu and then applied for the visual semi-quantitative detection of tetracyclines. With the addition of tetracyclines, the test paper exhibited a dosage-sensitive color conversion from cyan to pink with a visually discernible scale as low as 0.4 μM.
Tetracyclines decrease the fluorescence at 497 nm of europium (III) modified silicon nanoparticles (SiNPs/Eu) due to the inner filter effect and increase the one at 622 nm due to an antenna effect. Thus the fluorescence color of SiNPs/Eu changes from cyan to pink. Based on this color switch, a ultrasensitive and visual determination strategy for tetracyclines is proposed.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 6
·1-10
·
IF 5.479
Li Zhuanying,Cui Zhimeng,Tang Yiwei,Liu Xiuying,Zhang Xuemei,Liu Bingxiang,Wang Xianghong,Draz Mohamed Shehata,Gao Xue
The authors describe a microparticle-based system for the detection of the fluoroquinolone antibiotic ciprofloxacin. The method is using the tris(dibenzoylmethane)(1,10-phenanthroline)europium(III) luminophore in polystyrene microparticles along with a molecularly imprinted polymer (MIP) for ciprofloxacin. If ciprofloxacin is captured by the MIP, it quenches the fluorescence of the luminophores. Fluorescence drops linearly in the 0.5–100 μg L −1 ciprofloxacin concentration range, and the detection limit is 92 ng L −1 . The method was applied to the analysis of fish samples to assess the analytical performance of the probe. Recoveries ranged from 85.4 to 86.6%, and relative standard deviations between 2.1 and 3.9% (for n = 5).
Schematic presentation of a microparticle-based probe using the tris(dibenzoylmethane)(1,10-phenanthroline)europium(III) luminophore in polystyrene particles along with a molecularly imprinted polymer for ciprofloxacin. After removal of template, carboxylic groups left in the probe can bind to ciprofloxacin through hydrogen bonds.
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