SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Gangbing Zhu,Diyan Liao,Nian Hu,Jing Li,Yong He,Yinhui Yi
Herein, we proposed a novel bioenzyme-free dual-mode sensing strategy for the rapid and accurate monitoring of organophosphorus pesticides (OPs) by preparing tris(2,2′-bipyridyl) ruthenium(II) (Ru(bpy) 3 2+ ) encapsulated with UiO-66-NH 2 MOFs as nanozyme (Ru@Zr-MOFs). The as-prepared Ru@Zr-MOFs nanozyme not only exhibits superior peroxidase-like activity which can catalyze O-phenylenediamine (OPD) oxidation to generate yellow 2,3-diaminophenazinc, but also exhibits dual-fluorescence feature (at 442 and 612 nm respectively) and specific interaction capacity with OPs. However, in the existence of OPs, the peroxidase-like activity of Ru@Zr-MOFs nanozyme is restricted and the oxidation process of OPD is stopped; meanwhile, the fluorescence of Ru@Zr-MOFs at 442 nm increases rapidly (< 10 s) while that at 612 nm is apathetic, thus a colorimetric and ratiometric fluorescent sensing strategy was first designed to detect OPs by using glyphosate (Gly) as a typical model of OPs. Then, in consideration of the benefits of smartphone which can make the sensing process more convenient, stable, rapid and sensitive feedback, a smartphone coupled with hydrogel detection platform was proposed also for OPs determination. In addition, the designed sensing strategy offers superior selectivity , stability and real application capabilities. It’s thus expected the as-designed Ru@Zr-MOFs nanozyme based dual-mode sensing strategy possesses important real application for the low-cost, rapid, sensitive and accurate determination of OPs.
研究领域:
分析化学
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环境科学
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食品科学
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产品关联
DOI
高影响因子
Biosensors-Basel
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2024
·Vol. 14
·期 10
·512
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IF 4.9
Jiawen Fan,Junjie Qi,Jingkun Li,Fuwei Pi
Arginine has been widely applied in the food industry as coloring agents, flavoring agents, and nutritional fortifiers. It is also one of the major components of feed additives. Currently, methods for the highly selective detection of arginine remain absent. For accurate and sensitive detection of L−arginine, a novel ratiometric fluorescence assay based on Ru@UiO-66-NH2was developed and demonstrated in this study. Under optimized detection conditions, the limit of detection (LOD) of this assay for L-arginine was 2.32 μM, which is superior to most assays reported to date. Meanwhile, Ru@UiO-66-NH2showed good stability within 30 days, demonstrating the wide applicability of the proposed assay. The spike-and-recovery rates of the proposed assay for L-arginine in real samples (e.g., tea, grape juice, and serum) were 84.27–113.09%. Overall, the proposed assay showed high sensitivity, good reproducibility, and excellent stability in the detection of L-arginine in both buffer and real samples.
研究领域:
分析化学
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食品科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2024
·
IF 5.6
Dandan Guo,Diya Zheng,Ding Zhou,Changlun Tong,Shaohua Huang
Lysine (Lys) is an essential nutrient that plays a crucial role in the growth and development of living organisms. Chiral analysis of Lys holds significant importance for ensuring the safety of food, pharmaceuticals, and health products. In this work, an achiral Zr-based metal organic frameworks (MOFs), UiO-66-NH 2 , was proposed as a fluorescent probe to achieve rapid response to l -lysine (L-Lys) in solution. Additionally, Zr 4+ in the skeleton of UiO-66-NH 2 framework exhibited different binding capacities towards Lys enantiomers, leading to distinct fluorescence responses for L-Lys and d -lysine (D-Lys). Leveraging these properties, the UiO-66-NH 2 probe enabled accurate determination of L-Lys concentrations in solution, as well as the enantiomeric excess (ee) values of Lys solutions. Notably, in the detection of Lys enantiomers, the achiral UiO-66-NH 2 acted as both a chiral selector and a fluorescent indicator, greatly improving the efficiency and stability of the detection system. The probable mechanism was further elucidated by pH titration experiments and density functional theory calculations. Additionally, the general applicability of this mechanism was validated by similar amino MOFs. The application of the UiO-66-NH 2 fluorescent probe in analysis of infant formula milk powders and liquid milk samples confirmed the reliability of the method. Moreover, the construction of fluorescence test paper by immobilizing UiO-66-NH 2 onto filler papers enabled the rapid identification of Lys enantiomers. Compared to previous fluorescent analyses of chiral amino acids assisted by additional metal ions, this study presented a novel approach and methodology that offers high efficiency, stability, reproducibility and reusability for the identification and detection of Lys enantiomers, highlighting the potential of the UiO-66-NH 2 fluorescent probe in advancing analytical techniques.
研究领域:
分析化学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
·
IF 3.8
Douhao Yang,Ruiting Jian,Jianjun Yan,Ao Zhang,Bowen Liu,Zhongwei Liu
Defect engineering has a great effect on the properties of metal–organic frameworks (MOFs). In this study, the defective UiO-66-NH2 MOFs are successfully prepared by a rapid Ar plasma modification method. At certain experimental conditions (15 W radio frequency input power, 20 Pa working pressure, and 120 s Ar plasma modification time), the afforded UiO-66-NH2 shows significant enhancement in photocatalytic reduction of Cr(VI), and a maximum reduction efficiency of 68.5% is obtained. Advanced characterizations show that the plasma treatment generates missing-linker defects within the UiO-66-NH2 structure, which can enhance the separation of photogenerated electrons and holes and improve the photoreduction capability. The findings not only contribute to a better understanding of the relationship between the structure and performance of MOFs but also provide a simple approach for defect engineering of MOFs.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）