FOOD CHEMISTRY
·
2025
·
IF 9.8
Linchun Nie,Jiazhi Xia,Jiawei Liao,Na Liu,Meiling Xu,Dejing Meng,Wenjing Liu,Qingxiang Zhou,Chunmao Chen
In this work, polypyrrole-coated Cu, Ni co-doped ZIF-67 (PPy@CuNi-ZIF-67) was designed and prepared via a facile method. Calcined PPy@CuNi-ZIF-67 exhibited highly efficient oxidase-like activity and possessed excellent capacity to oxidize colorless 3,3′,5,5′-tetramethyl benzidine (TMB) into blue oxidation products (oxTMB) within 4 min. Glutathione (GSH) and sulfur-containing compounds can inhibit its oxidase-like activity. Based on this principle, an effective colorimetric method was developed in combination with a smartphone for efficient, sensitive, and visual detection of GSH. Under optimal conditions, good linearity was achieved in the range of 0.83–33.33 μM, and the visual detection limit was 0.27 μM. Moreover, based on the response difference of different sulfur-containing compounds to different chromogenic substrates, a new array sensor was constructed with three chromogenic substrates. The array sensor was proven to quickly distinguish five sulfur-containing compounds at a concentration as low as 8.3 μM in combination with principal component analysis and hierarchical clustering analysis.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 42
·19569-19577
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IF 3.3
Xiaoqi Zhao,Xue Zhang,Yingxiao Li,Ling Liu,Yanfang Gao
Developing non-precious metal catalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is critical for Zn–air batteries. Herein, using NaCl and ammonium oxalate as templates to prepare a hierarchical porous Fe–N–C catalyst using an inorganic salt melting strategy is proposed. The prepared Fe–N–C-x catalysts have a hierarchical porous structure that increases the specific surface area, improves the exposure of a number of active sites and enhances the chance of contacting active sites. The structure change of a leaf-shaped zeolitic imidazolate framework (ZIF-L) during high-temperature pyrolysis was used to self-catalyze the growth of carbon nanotube structures, forming a structure of carbon nanotubes including Fe nanoparticles to provide additional active sites and reduce the aggregation of metal particles. From the perspective of economy and electrochemical performance, it is found that when the addition amount of NaCl and ammonium oxalate respectively is 2 g, the electrochemical performance of the ORR, OER and Zn–air batteries is better, and the preparation cost of the catalyst is more affordable. This strategy of forming hierarchical porous Fe–N–C catalysts by self-catalytic growth of Fe, N co-doped CNTs using inorganic salts provides a new design idea for the preparation of new hierarchical porous electrocatalysts.
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 9
·1-9
·
IF 5.479
Chen Han,Wu Xingxing,Zhao Rui,Zheng Zhou,Yuan Qunhui,Dong Zhijun,Gan Wei
The integration of derivatives of granular metal-organic frameworks (MOFs) and an electrically conductive carbon substrate is an effective way to circumvent the deficiency of powdered pristine MOFs or MOF-derived carbon in practical application. The authors describe the use of graphite oxide (GO) as a substrate for in-situ assembly with the zeolitic imidazole framework ZIF-67. The GO and ZIF-67 composites were converted, via pyrolysis, into reduced graphite oxide loaded with Co/N-co-doped carbon polyhedrons (ZIF-67C@rGO). By using various amounts of GO, a series of ZIF-67C@rGO- x with different fractions of GO were synthesized and utilized as electrode modifiers for the detection of the antibiotic metronidazole (MNZ). The results revealed that the ZIF-67C@rGO-0.06 display best sensing performance. This is likely to be due to its hierarchically open pores, abundant active sites and good electrical conductivity. The sensor, best operated near a working potential around −0.6 V (vs. SCE), has a linear response in the 0.5 to 1000 μM MNZ concentration range and a 0.05 μM detection limit. The sensor was applied to the analysis of pharmaceutical samples where it showed excellent selectivity, good repeatability and satisfying recoveries.
Schematic representation of preparation and application of ZIF-67C@rGO- x .
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高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2023
·
IF 4.3
Mohammad Nazari Kalojeh,Roghayeh Hassanpour Sabet,Mir Ali Farajzadeh,Mohammad Reza Afshar Mogaddam,Elnaz Marzi Khosrowshahi,Mustafa Tuzen
A dispersive solid phase extraction procedure was established for the extraction of some pesticides from fruit juices and then it was combined with dispersive liquid-liquid microextraction for more enrichment of the analytes. For this purpose, 40 mg of zeolitic imidazolate framework-carbon dot composite was dispersed into the sample solution as the sorbent via vortex agitation. After that, the sorbent was collected by centrifugation and the supernatant was wasted. Then, 1 mL of a water-soluble organic solvent (acetone) was added onto the sorbent as the elution solvent. After desorption of the analytes from the sorbent surface, the eluate was mixed with a water-immiscible organic solvent (1,1,2-trichloro-1,2,2 trifluoroethane) at µL-level (45 µL) and the mixture was quickly injected into 5 mL deionized water. The resulting cloudy mixture was centrifuged and 1 µL of the sedimented phase was injected into a gas chromatography-flame ionization detection system. After the optimization of the method, its validation was evaluated. The data showed that the limits of detection and quantification obtained by this method were in the ranges of 0.22–0.72 and 0.73–2.40 ng mL −1 , respectively. The plotted calibration curves were linear in the range of 0.73–1000 µg L −1 for all analytes. High enrichment factors (375−445), and extraction recoveries (75–89%), and negligible matrices effect were obtained for the investigated analytes by the introduced method. Also, the obtained data showed that all samples were free of the analytes.
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高影响因子
Analytical Methods
·
2025
·
IF 2.6
Xu Xu,jing Li,Yaodong Zhang
A novel and simple ratio fluorescence detection method for H2O2 and glucose was proposed on the basis of the Aggregation-induced luminescence effect of the Aggregation-induced emission (AIE) molecule 4-formyl-3-hydroxybenzoic acid (FHBA) in ZIF-8 and the mechanism of Fluorescence resonance energy transfer (FRET) between the complex FHBA@ZIF-8 and Diallyl phthalate (DAP). First, glucose was oxidized to H2O2 under the catalysis of glucose oxidase. The latter further oxidized o-phenylenediamine in the presence of horseradish peroxidase to generate DAP yellow fluorescent compound (560 nm). The fluorescence of FHBA@ZIF-8 at 445 nm can be effectively quenched because the ultraviolet absorption spectrum of DAP overlaps well with the emission spectrum of FHBA@ZIF-8. Therefore, a highly sensitive ratiometric fluorescence detection method for detecting H2O2 and glucose was constructed using the change of the ratio of fluorescence intensity at two wavelengths (F560/F445). The linear range of H2O2 detection by this method is 1–150 μM, and the detection limit is 0.21 μM. The linear range of glucose detection is 1–100 μM, and the detection limit is 0.17 μM. The method was successfully applied to the detection of glucose in human serum samples, and it has broad potential in clinical diagnosis and research
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