JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2016
·
IF 2.822
Wenjing Wang,Lu Wang,Lina Zou,Gaiping Li,Baoxian Ye
Arctigenin was determinated by an electrochemical method for the first time based on a novel voltammetric sensor, which was prepared by simple dipping-drying of SWCNTs on glassy carbon electrode (GCE) initially and then electrochemical deposition of Iodide. The resulting Iodide/SWCNTs/GCE displayed a significant voltammetric response to arctigenin due to the electrocatalytic ability of Iodide for arctigenin and a large specific surface area, excellent electric conductivity of SWCNTs. Meanwhile, the redox mechanism of arctigenin on Iodide/SWCNTs/GCE was also studied. The wide linear range of 3 × 10 − 8 mol L − 1 to 5 × 10 − 6 mol L − 1 and low detection limit of 1 × 10 − 8 mol L − 1 for the determination of arctigenin were achieved together with high sensitivity, selectivity, good stability. To examine the practical analytical utility of the proposed electrode, the real sample Fructus Arctii was examined and the result was found satisfactory.
研究领域:
分析化学
·
电化学传感器
·
中药分析
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Linna Guo,Miao Tian,Zhi Li,Qianqian Wang,Qiuhua Wu,Lin Hao,Chun Wang
Wide use of phenylurea herbicide has caused serious residue problem and threaten human health. It is important to develop viable method for their sensitive determination. Herein, a multi-functionalized porous polymer was prepared by crosslinking hexafluorobisphenol A with pyromellitic dianhydride. Using the multi-functionalized porous polymer as solid phase extraction sorbent, combined with high performance liquid chromatography, a sensitive method was established for determining phenylurea herbicides in beverages and celtuces. High sensitivity was achieved, with method detection limit (S/N = 3) of 0.01–––0.025 ng mL −1 for beverages, 1.70 ng g −1 for celtuce, and quantitation limits of 0.03–––0.10 ng mL −1 for beverages, 5.00 ng g −1 for celtuce. The method recoveries were 80.5–––120.0 % with relative standard deviations lower than 6.1%. Adsorption mechanism mainly involved F-π, F-O, π-π, polar interactions and hydrogen-bonding interactions. This study offers a simple protocol to develop multi-functional sorbents for extraction of organic pollutants.
研究领域:
环境科学
·
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 1
·1-13
·
IF 2.533
Lu Yifei,Wang Sui,Guo Zhiyong,Hu Yufang
A ratiometric fluorescence sensor (c-CDs/Ru(bpy) 3 2+ ) based on the selective recognition of chitosan carbon dots (c-CDs) on ClO − and combine with Ru(bpy) 3 2+ was established for sensitive and visual monitoring of hypochlorite ion (ClO − ). Using this nanosensor, a highly sensitive assay of ClO − in the linear range of 0.026 − 70 μM with a low detection limit (LOD) of 8.6 nM was provided by quenching the blue emission fluorescence. It is more attractive that ClO − can also be visualized by this nanosensor via evident color changes of the solution (from blue to red) under an ultraviolet (UV) lamp. In addition, since c-CDs and Ru(bpy) 3 2+ have good water dispersibility and water solubility, respectively, the sensor can be applied to the detection of HClO in 100% aqueous solution. This is a new colorimetric and fluorescent dual-mode nanosensor with more simple preparation procedures, low cost, and excellent biocompatibility. It provides a new method for detecting ClO − and promotes the development of biosensing.
研究领域:
分析化学
·
纳米技术
·
生物传感器
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 43
·5179-5186
·
IF 2.896
Yumei Yan,Yuan Qu,Rui Du,Wenfeng Zhou,Haixiang Gao,Runhua Lu
In this paper, a simple and innovative colorimetric method is established, which is based on DBP-induced aggregation of arginine functionalized gold nanoparticles (ARG-AuNPs), and can be used for the sensitive determination of dibutyl phthalate (DBP) in Baijiu samples. The morphological characteristics and the color changes of ARG-AuNPs caused by aggregation show good sensitivity, and can be observed through ultraviolet-visible spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), dynamic light scattering (DLS) and zeta potential technology. The color change of ARG-AuNPs from red to blue is due to the strong non-covalent interactions between DBP and ARG-AuNPs (electrostatic, van der Waals force and hydrogen bonding), which leads to the reduction of the electrostatic repulsion between the nanoparticles and aggregation. A two-stage linear equation was established between the absorption ratio (A690/A530) and the DBP concentration (0.0–2.8 mg L−1); the correlation coefficient (R2) was 0.9914–0.9940, and the detection limit (LOD) was estimated at 0.05 mg L−1. The designed ARG-AuNPs acting as a dependable sensor for the detection of Baijiu samples equally acquired satisfactory recoveries. When the concentration of DBP in the solution is more than 1.0 mg L−1, the color change can be clearly observed by the naked eye; so there is no need for sample preparation techniques and tedious operations to quickly and semi-quantitatively detect DBP. The successful application of the proposed method in Baijiu samples indicates its potential to detect DBP in more complex environment samples.
研究领域:
分析化学
·
环境科学
·
纳米技术
·
食品安全
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）