FOOD CHEMISTRY
·
2023
·
IF 8.8
Ting Wang,Lei Zhang,Jieyuan Zhang,Gaoxian Guo,Xinhui Jiang,Zhengwei Zhang,Siqiao Li
Carbendazim (CBZ), a well-known benzimidazole pesticide, is utilized in agriculture to prevent and cure plant diseases caused by fungi. Residual CBZ in food poses serious threat to human health. Herein, a fluorescent two-dimensional terbium-based metal–organic framework (2D Tb-MOF) nanosheet sensor was developed for the rapid and ultrasensitive detection of CBZ. The 2D Tb-MOF nanosheets, prepared with Tb 3+ ions and 5-borono-1,3-benzenedicarboxylic acid (BBDC) as the precursors, exhibited excellent optical properties. Upon the addition of CBZ, the fluorescence of Tb-MOF nanosheets was quenched because of the inner filter effect (IFE) and dynamic quenching. The fluorescence sensor offered two linear ranges of 0.06–4 and 4–40 µg/mL with a low detection limit of 17.95 ng/mL. Furthermore, the proposed sensing platform was successfully applied to assay CBZ in apples and tea, and satisfactory results were obtained. This study provides an effective alternative strategy for the qualitative and quantitative determination of CBZ to ensure food safety.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 7
·1375-1381
·
IF 3.286
Sun Chongmei,Shen Jin,Cui Rongwei,Yuan Fangzheng,Zhang Hui,Wu Xia
A sensitive fluorescent analytical method for the detection of dopamine (DA) was developed based on surface-enhanced Tb(III)/La(III) co-luminescence using silver nanoflowers (AgNFs). Anisotropic AgNFs show strong surface-enhanced fluorescence effect owing to the abundant sharp tips. Tb(III)/La(III)-DA complexes mainly bind to the sharp tips of AgNFs and thus shorten the distance between the complexes. The shortened distance gives rise to obvious surface-enhanced Tb(III)/La(III) co-luminescence effect. In this work, AgNFs offer many superior properties, such as enhanced intrinsic green fluorescence of Tb(III) ( λ ex / λ em = 310/546 nm), increased fluorescence lifetime, and improved energy transfer efficiency. Under the optimum conditions, the fluorescence intensity is linearly correlated with the concentration of DA in the range of 0.80–10 nM ( R 2 = 0.9970), and the detection limit is 0.34 nM ( S/N = 3). The fluorescent nanoprobe was successfully applied to the determination of DA in human serum samples with recoveries ranging from 99.1 to 102.6%.
Graphical abstract
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CRYSTENGCOMM
·
2018
·Vol. 20
·期 40
·6351-6357
·
IF 3.304
Kui-Suo Yang,Yi-Lian Li,Yang-Yang Ma,Li-Na Feng,An-Ping Wu,Yan Qiao,Jin-Rong Bao,Wen-Xian Li,Xiao-Wei Zhu,Ran-Bo Yu
A novel core–shell–shell SiO2@CePO4:Tb@SiO2 submicro-sphere was controllably synthesized by a bridging ligand organosilane HOOCC6H4N(CONH(CH2)3Si(OCH2CH3)3)2 (MABA-Si) connecting the silica core and rare earth ions. The as-synthesized samples were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and infrared spectroscopy (IR). It is found that SiO2@CePO4:Tb@SiO2 has a ∼25 nm outermost shell, a ∼4 nm intermediate shell, and a ∼200 nm core. SiO2@CePO4:Tb@SiO2 exhibits stable photoluminescence properties in aqueous solution: its photoluminescence intensity was unquenched even after 15 days. The core–shell–shell submicro-spheres were found to have better photoluminescence than the core–shell submicro-spheres because the SiO2 shell protected the phosphor materials and then improved its photoluminescence intensity and biocompatibility. A formation mechanism of the core–shell–shell SiO2@CePO4:Tb@SiO2 submicro-spheres was proposed. Thus, the low-cost preparation of the core–shell–shell SiO2@CePO4:Tb@SiO2 submicro-spheres could be rationally achieved using SiO2.
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TALANTA
·
2018
·
IF 4.244
Li Yang,Yonghai Song,Mulan Zeng,Yue Du,Bingxian Peng,Zhenzhong Huang,Li Wang
It is of great significance for superoxide anion (O 2 •− ) detection due to its important role in regulation of biological function. The nanoscale coordination polymers (NCPs) core-shell nanostructures have attracted increasing interests for their nanosized-dependent properties. In this study, SiO 2 @Tb/guanosine 5′-monophosphate (GMP) NCPs with core-shell nanostructures was designed for O 2 •− detection. The SiO 2 @Tb/GMP NCPs core-shell nanostructures were produced by using SiO 2 nanoparticles (NPs) as template to control their nano-size. First, Tb 3+ was adsorbed on the surface of SiO 2 NPs by coordination with -COOH of SiO 2 NPs. Then the Tb/GMP NCPs shells were grown along the surface of SiO 2 NPs. The SiO 2 @Tb/GMP NCPs core-shell nanostructures were characterized with scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and Zeta potential. The resulted SiO 2 @Tb/GMP NCPs core-shell nanostructures displayed strong Tb/GMP emission which decreased linearly with the increased O 2 •− concentration in the range from 5.3 nM to 6.0 μM with a limit detection of 2.18 nM. And the SiO 2 @Tb/GMP NCPs core-shell nanostructures also exhibited good selectivity and high sensitivity in HEPES buffer at pH 7.4.
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PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Yuqing Yang,Bihua Xiao,Xianhai Hu,Yuxi Xian,Ping Wang,Chengbing Gong,Xiang Luo,Mingjun Li,Jin Liu,Yunsheng Ding,Pei Xu,Chao Liu
A green fluorescent complex [Tb(PABA) 3 Phen] with fluorescence lifetime up to 0.837 ms was synthesized in ethanol by using p-aminobenzoic acid as the first ligand, o-phenanthroline as the second ligand and Tb 3+ as the central ion. A long-life green fluorescent waterborne polyurethane-base Tb(III) ternary complex (Tb-WPU) with UV shielding was prepared by a modified acetone method using Tb(PABA) 3 Phen as chain extender. The structure and properties were characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analyzer (TGA), fluorescence spectroscopy (FL), etc. The absolute value of Zeta potential increases with the increase of Tb(PABA) 3 Phen content, and all of them are greater than 40. Tb-WPU can effectively shield UV in the range of 200 nm–315 nm. With the increase of Tb(PABA) 3 Phen content, the fluorescence intensity of Tb-WPU increased gradually and the luminous life is up to an astonishing 1.375 ms. The initial thermal decomposition temperature of Tb-WPU is above 220 °C. In addition，Tb-WPU uses water as the dispersed phase and is suitable for environmental protection.
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ANALYST
·
2021
·Vol. 147
·期 2
·282-292
·
IF 4.616
Chenhui Wu,Yunkang Ma,Yingxia Zhou,Wenjie Yang,Lihua Chen
Biofouling is a nuisance in the practical applications of biosensors, which seriously affects the reliability and accuracy of detection. The utilization of antifouling interface materials is a promising option for mitigating biofouling. Only highly accumulated antifouling polymeric surfaces tend to offer “zero” nonspecific protein adsorption. Herein, superior antifouling coatings based on chondroitin sulfate (CS) were prepared by the NH2-MIL-53 (Al) assisted strategy. This is a novel design to improve the antifouling property of material by taking advantage of the high specific surface area of the three-dimensional MOF to increase the accumulation degree of antifouling functional groups per unit area. And the related chemical technology is simple and easy to operate. As expected, this novel CS-loaded MOF demonstrated an excellent antifouling performance in various biological samples, even in 100% goat serum. Only 8.48% changes of differential pulse voltammetry (DPV) were found. Furthermore, this antifouling interface material is successfully applied for the specific detection of the tuberculosis (TB) gene in undiluted biofluids. This developed TB biosensor showed a high analytical performance with a wide linear range (1.00 × 10−16 M to 1.00 × 10−11 M) and a low detection limit, indicating that it may open new avenues for direct biosensing of disease markers for clinical samples.
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Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Liu Yang,Yu-Long Liu,Xian-Xian Ji,Cheng-Guo Liu,Ying Fu,Fei Ye
Background A novel luminescent sensor with dual-emitting platforms, Tb@UiO-66 , was used for highly detecting Sm 3+ and teflubenzuron. Methods Tb@UiO-66 was synthesized on basis of the exchange of guest molecules, where Tb 3+ ions were encapsulated into the cages of UiO-66 . Significant finds The results of multiband fluorescence originated from the linker-to-cluster charge transfer and the characteristic emission of Tb III . Tb@UiO-66 displayed luminescence enhancements or quenches according to small molecules. Especially for Sm 3+ and teflubenzuron, the characteristic peaks of Tb@UiO-66 at 490, 545, 585, and 621 nm increased with the increasing of the concentration of the analytes, where Tb@UiO-66 exhibited the effect of luminescence enhancement. The detection limits for detecting Sm 3+ and teflubenzuron were 0.09 μM and 0.21 μM, and the changes of luminescence intensities could be observed by naked eyes under the UV light at 365 nm. Tb@UiO-66 could also be used to detect teflubenzuron in real water samples. Tb@UiO-66 could be reused for at least 5 cycles for the detection of Sm 3+ and teflubenzuron with the framework of Tb@UiO-66 uncollapsed. These results implied that the integration of Ln III luminescent materials and Zr-MOFs by doping method provided a new strategy for fabricating novel luminescent sensors for detecting polluting small molecules.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Zhibin Lai,Jun Ye,Jian Xiong
A series of fluorescent nanocomplexes of carboxymethyl cellulose (CMC)/Terbium (Tb)- Europium (Eu) were successfully synthesized without introducing a second ligand. By adjusting the concentration of the coordinated ions, these nanocomplexes exhibit favorably visibly tunable luminescence properties with colors being able to change from green to red. The XPS analysis demonstrates the formation Tb(III)-O 2− and Eu(III)-O 2− between OH and COO − in CMC and Tb 3+ or Eu 3+ ions, which is advantage for light absorption by UV–Vis spectroscopy and fluorescence spectroscopy. The ligand CMC plays a role in coordinating with terbium and europium ions, but also serves as an energy donor to these metal ions by antenna effect. Moreover, the energy transfer also occurred from terbium ions to europium ions in CMC matrix, which is responsible for the tunable luminescence properties of these complexes.
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LUMINESCENCE
·
2017
·Vol. 33
·期 1
·119-124
·
IF 1.509
Nan Liu,Juan Hao,Keying Cai,Mulan Zeng,Zhenzhong Huang,Lili Chen,Bingxian Peng,Ping Li,Li Wang,Yonghai Song
A novel ratiometric fluorescence nanosensor for superoxide anion (O 2 •− ) detection was designed with gold nanoparticles-bovine serum albumin (AuNPs-BSA)@terbium/guanosine monophosphate disodium (Tb/GMP) nanoscale coordination polymers (NCPs) (AuNPs-BSA@Tb/GMP NCPs). The abundant hydroxyl and amino groups of AuNPs-BSA acted as binding points for the self-assembly of Tb 3+ and GMP to form core-shell AuNPs-BSA@Tb/GMP NCP nanosensors. The obtained probe exhibited the characteristic fluorescence emission of both AuNPs-BSA and Tb/GMP NCPs. The AuNPs-BSA not only acted as a template to accelerate the growth of Tb/GMP NCPs, but also could be used as the reference fluorescence for the detection of O 2 •− . The resulting AuNPs-BSA@Tb/GMP NCP ratiometric fluorescence nanosensor for the detection of O 2 •− demonstrated high sensitivity and selectivity with a wide linear response range (14 nM–10 μM) and a low detection limit (4.7 nM).
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Liyan Liu,Yufei Zhang,Siqi Liu,Zhongbao Han,Zhan Yu
Tetracycline (TC) residues are frequently detected in food products and pose potential risks to human health, thus driving the demand for rapid and reliable analytical methods. In this study, a terbium-based metal-organic framework (Tb-MOF) constructed from a boronic-acid–containing ligand, 3,5-dicarboxyphenylboronic acid (5-bop), was synthesized via a one-pot hydrothermal route and evaluated as a fluorescent probe for TC. Comprehensive structural and optical characterization confirmed the successful synthesis of the crystalline Tb-MOF and its characteristic strong green emission under UV excitation. Mechanistic studies indicated that the fluorescence quenching of Tb-MOF by TC originates from dynamic quenching processes including the inner filter effect (IFE) and photoinduced electron transfer (PET). The Tb-MOF probe exhibited a linear response to TC in the concentration range of 0 to 60 μmol/L, with a detection limit of 153 nmol/L. Furthermore, the Tb-MOF sensor was successfully applied to detect TC in real-world food samples including milk and beef, yielding satisfactory recovery and accuracy. This work provides an effective alternative strategy for the quantitative monitoring of TC in complex food substrates, highlighting its significant potential for enhancing food safety assurance.
研究领域:
材料科学
·
分析化学
·
食品安全
·
传感器与生物传感器
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Xiaoqian Dong,Xiaochen Yu,Xu Zhang,Zhehan Zhang,Xiao He,Ruru Wei,Youru Bai,Jibin Fan
Tb-ZnO/reduced graphene oxide (Tb-ZnO/RGO) nanocomposites were prepared by a simple one-step solvothermal method. The samples were characterized by XRD , SEM, XPS, BET, FT-IR, and Raman spectroscopy , and their photocatalytic activities toward different pollutants (RhB, MO, PR, and MB) degradation were evaluated. Tb-ZnO/RGO nanocomposite shows enhanced photocatalytic activity with high kinetic constants (0.04 min −1 ) and good stability. Enhanced charge separation and migration have been analyzed using UV–Vis absorption spectra , PL spectra, and EIS analysis. Improved photocatalytic activity can be ascribed to the smaller band gap, larger specific surface area (28.3478 m 2 /g) and more effective separation and transport of photogenerated carriers by Tb 3+ and RGO. All the results show that the nanocomposite catalyst has a good application prospect in the degradation of pollutants.
研究领域:
材料科学
·
环境科学
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JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2024
·
IF 3.2
Qi Zhang,Guoyu Zhao,Qingxian Zhao,Xian Wei,Wei Wei
Ultrathin and transparent scintillator films for X-ray microscopic imaging are urgently desired to accurately detect the internal tiny structure of objects in nondestructive way. However, it is great difficulty for the commercial scintillators (e.g., CsI:TI, LYSO:Ce) to obtain the ultrathin single crystal scintillators below 50μm. Additionally, scintillator powders such as Gd 2 O 2 S:Tb, when embedded in polymeric matrix, demonstrate significant scattering resulting from their opacity and substantial thickness. Here, we present a novel ultrathin (∼46μm) and transparent (∼90%) LaF 3 :Tb,Ce-polyvinyl alcohol (PVA) composite scintillator film with ultra-high loading content (∼85wt%) for high resolution X-ray microscopic imaging. It is obtained by thoroughly mixing directly precipitated LaF 3 :Tb,Ce nanocrystals (∼13nm) prepared by direct precipitation and PVA solution, followed by scraping and drying. The harmless solvent and low preparation temperature (below 100℃) contribute to its convenient and eco-friendly nature. More importantly, the film realizes high spatial resolution of 7μm thanks to its ultrathin and transparent feature.
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