NANO
·
2019
·
IF 1.293
Na Wang,Jianyao Kou,Lijie Wang,Fei Wang,Kui Lu
A novel electrochemically activated ZrO 2 nanoparticles modified carbon paste electrode (CPE) (ZrO 2 -CPE(ox)) was prepared and applied for selective and sensitive determination of hyperin. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectra and electrochemical experiment were used to characterize the ZrO 2 nanoparticles and investigate the electrochemical performance of the ZrO 2 -CPE(ox). Compared with bare CPE and electrochemically activated CPE (CPE(ox)), the ZrO 2 -CPE(ox) got more reactive sites by electrochemical treatment and exhibited larger effective surface area and more excellent electrochemical catalytic activity toward the redox of hyperin. Under the optimum conditions, the oxidation peak currents showed a linear relationship with the concentrations of hyperin in the range of 5 . 0 × 1 0 − 9 – 2 . 0 × 1 0 − 6 mol L − 1 and 2 . 0 × 1 0 − 6 – 1 . 2 × 1 0 − 5 mol L − 1 , and a low detection limit of 1 . 0 × 1 0 − 9 mol L − 1 was achieved for hyperin. Moreover, the proposed method exhibited an excellent selectivity, stability, reproducibility and repeatability, which make it very suitable for a potential choice for determining the concentrations of hyperin in drug matrices.
研究领域:
分析化学
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药物分析
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2016
·Vol. 29
·期 3
·835-842
·
IF 2.471
Zhengkun Xie,Yongmei Wu,Sheng Kai,Gaiping Li,Baoxian Ye
A novel electrochemically activated doped Ta 2 O 5 particles modified carbon paste electrode (EA-Ta 2 O 5 -CPE) was prepared and applied for selective and sensitive determination of chrysin. X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) techniques and cyclic voltammetry (CV) were used to characterize the Ta 2 O 5 particles and investigate the electrochemical response of the sensor. Compared with bare CPE, the doped Ta 2 O 5 modified electrode got much more porous by electrochemical treatment and exhibited larger effective surface area, more reactive site and excellent electrochemical catalytic activity toward the oxidation of chrysin. Under optimum conditions by LSV, the oxidation peak currents responded to chrysin linearly over a concentration range from 5.0×10 −8 to 7.0×10 −6 mol L −1 with a detection limit of 2.0×10 −8 mol L −1 (5.08 ng mL −1 ). The fabricated sensor showed anti-interference ability against the biological common interferents (i.e. baicalein, baicalin) and provided to be reliable for the determination of chrysin in Chinese medicinal herb Oroxylum indicum and chrysin capsules samples with satisfactory results.
研究领域:
分析化学
·
药物分析
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Yi Wu,Yuting Wu,Xuchu Lv,Wu Lei,Yong Ding,Chenglong Chen,Jingjing Lv,Shasha Feng,Shen-Ming Chen,Qingli Hao
Herein, a sensitive sensing platform for acetaminophen based on palladium and multi-walled carbon nanotube nanocomposites and its electrochemical detection mechanism were presented in the first time. Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy were utilized to characterize the morphology and structure of Pd-MWCNTs composite. Through the computer simulation, the Gaussian 09 and Multiwfn methods were used to study the redox mechanism of AP. Further electrochemical performance of AP was carried out by cyclic voltammetry (CV). The experimental results illustrated that Pd-MWCNTs modified electrode amplified the redox current of AP. Quantitative detection of AP by the DPV method revealed that the oxidation peak current of AP showed an acceptable linear response of 0.5 μM–100 μM with a detection limit of 0.13 μM (S/N = 3). The modified electrode also exhibited a good recovery in real sample detection.
研究领域:
分析化学
·
材料科学
·
药物分析
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 52
·期 2
·907-916
·
IF 2.047
Shao Mengyao,Hu Bin,Ge Shengyan,Zhou Xingfu
Ti/TiO 2 / SnO 2 -Sb-Ir/SnO 2 -Sb-Ni electrodes modified with three kinds of TiO 2 interlayer materials were fabricated. TiO 2 macroporous membrane (MAc) substrate was prepared by direct calcination, and TiO 2 nanotubes (NTs) and TiO 2 mesoporous membrane (MEs) substrate were fabricated by anodic oxidation under different conditions. The study shows that the TiO 2 -nanotube-based anode reduces crack morphology and provides a larger surface area for loading the electrochemically active materials. TiO 2 -NTs as the optimized interlayer improve the oxygen evolution potential (OEP) from 1.49 to 1.85 V and increase the current density of the oxidation peak from 0.28 to 0.55 mA cm −2 , which enhances the oxidative degradation ability of the electrode. In addition, the service life of the Ti/TiO 2 -NTs/SnO 2 -Sb-Ir/SnO 2 -Sb-Ni electrodes is 3.18 times longer than that of the Ti/SnO 2 -Sb-Ir/SnO 2 -Sb-Ni electrodes according to accelerated life tests. The degradation rate of methylene blue (MB) wastewater with an initial concentration of 20 mg L −1 reaches 99.14% under 5.0 V within 5 min by using Ti/TiO 2 -NTs/SnO 2 -Sb-Ir/SnO 2 -Sb-Ni electrodes, which is 1.67 times more than that of the Ti/SnO 2 -Sb-Ir/SnO 2 -Sb-Ni electrodes. Graphical Abstract
Ti/SnO 2 -Sb-Ir/SnO 2 -Sb-Ni electrodes modified with three kinds of TiO 2 interlayer have been
fabricated. The service life of the optimized Ti/TiO 2 -NTs/SnO 2 -Sb-IrO 2 /SnO 2 -Sb-Ni electrode is
3.18 times longer than that of the Ti/SnO 2 -Sb-Ir/SnO 2 -Sb-Ni electrodes. The degradation rate of
the optimized electrode reaches 99.1 % within 5 min, which is 1.67 times more than that of the
Ti/SnO 2 -Sb-Ir/SnO 2 -Sb-Ni electrodes.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2016
·
IF 2.822
Lu Wang,Qinqin Wang,Kai Sheng,Gaiping Li,Baoxian Ye
A new graphene nanocomposite , CeO 2 -poly(diallyldimethylammonium chloride)-graphene (CeO 2 -PDDA-GR), was prepared by an easy and low-cost hydrothermal method . The images of transmission electron microscopy (TEM) showed that well-shaped CeO 2 nanoparticles distributed more uniformly on the GR sheets. Based on the CeO 2 -PDDA-GR composites modified glassy carbon electrode, the electrochemical properties of eriocitrin were investigated in detail and a sensitive determination method was established synchronously. Differential pulse voltammetry (DPV) measurement revealed that the oxidation peak current increased linearly with eriocitrin concentrations in range of 1.0 × 10 − 8 mol L − 1 –1.0 × 10 − 6 mol L − 1 with detection limit of 7.0 × 10 − 10 mol L − 1 (S/N = 3). Moreover, the proposed method was used in determination of eriocitrin in lemon sample with accurate results.
研究领域:
分析化学
·
电化学传感器
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2012
·
IF 4.859
Runqiu Nie,Xiangjie Bo,Huan Wang,Lijun Zeng,Liping Guo
A chiral electrochemical sensor has been prepared via cysteic acid modified glassy carbon (CyA-GC) electrode to discriminate tyrosine (Tyr) enantiomers . Sweep cycles of CyA-GC in modification process and pH of solution were investigated to obtain optimum experimental conditions. Electrochemical impedance spectroscopy was employed to characterize the electrical conductivity of the modified electrode . For the first time, different oxidation peak potentials ( E p ) of l - and d -Tyr were observed in the differential pulse voltammograms obtained in the solution containing l - or d -Tyr. Further study showed that only one peak appeared in mixture solution containing l - and d -Tyr and E p of that peak shifted positively and linearly with an increasing percentage of l -isomer of Tyr racemic mixture.
研究领域:
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 3
·1-10
·
IF 5.7
Shi Min,Xue Shu-Ya,Peng Guan-Wei,Xu Jing-Kun,Gao Yan-Sha,Liu Shu-Wu,Duan Xue-Min,Lu Li-Min
Graphdiyne (GDY) has attracted a lot of interest in electrochemical sensing application with the advantages of a large conjugation system, porous structure, and high structure defects. Herein, to further improve the sensing effect of GDY, conductive MWCNTs were chosen as the signal accelerator. To get a stable composite material, polydopamine (PDA) was employed as connecting bridge between GDY and MWCNTs-NH 2 , where DA was firstly polymerized onto GDY, followed by covalently linking MWCNTs-NH 2 with PDA through Michael-type reaction. The formed GDY@PDA/MWCNTs-NH 2 composite was then explored as an electrochemical sensor for benomyl (Ben) determination. GDY assists the adsorption and accumulation of Ben molecules to the sensing surface, while MWCNTs-NH 2 can enhance the electrical conductivity and electrocatalytic activity, all of which contributing to the significantly improved performance. The proposed sensor displays an obvious oxidation peak at 0.72 V (vs. Hg|Hg 2 Cl 2 ) and reveals a wide linear range from 0.007 to 10.0 µM and a low limit of detection (LOD) of 1.8 nM ( S / N = 3) toward Ben detection. In addition, the sensor shows high stability, repeatability, reproducibility, and selectivity. The feasibility of this sensor was demonstrated by detecting Ben in apple and cucumber samples with a recovery of 94–106% and relative standard deviations (RSDs) less than 2.3% ( n = 5). Graphical Abstract A sensitive electrochemical sensing platform was reported for benomyl (Ben) determination based on a highly stable GDY@PDA/MWCNTs-NH 2 composite.
研究领域:
电化学
·
材料科学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）