International Journal of Electrochemical Science
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2023
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IF 1.5
Yuyuan Liu,Jie Liu,Qianli Zhang,Jie Wei,Guiyun Xu
Bismuth (Bi) nano-needle, nano-rod, nano-sheet, and nano-flower were synthesized using a facile one- step solvothermal method by adjusting the volume of ethylenediamine (EDA). The prepared Bi nanoparticles were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis and their formation mechanism was discussed. Bi nano-particle modified carbon paste electrode (CPE) combined with differential pulse anodic stripping voltammetry (DPASV) was developed for the determination of Cd (II). It was shown that Bi nano-flower modified electrode displayed the highest detection sensitivity on account of its particular three-dimensional structures. The stripping peak currents of Cd (II) at “bulk” and “drop coating” Bi nano-flower modified CPEs were compared with those of Bi film modified CPEs using “in-situ” and “out-situ” plating methods. The optimized detection conditions were 5% Bi nano-flower bulk modified CPE at pH 4.4, deposition potential of -1.2 V ( vs . AgCl/Ag) and deposition time of 200 s. The linear range, sensitivity and detection limit were 0.05 - 1 μM, 27.5 μA/μM, and 2.4 nM , respectively. The proposed Bi nano-flower bulk modified CPE was conveniently usable in the trace Cd (II) analysis for environmental water samples with the recovery rang of 91.1%-105.6%.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2022
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IF 6.911
Ruihua Huang,Ke Zhang,Haowei Sun,Dafeng Zhang,Jian Zhu,Shuxing Zhou,Wenyan Li,Yongtao Li,Chunqiong Wang,Xiuxiu Jia,Thomas Wågberg,Guangzhi Hu
In this study, cetyltrimethylammonium bromide and zeolitic imidazolate framework-8 (ZIF-8) were first assembled via the chemical co-precipitation, and high-quality carbon-based metal-free nanomaterials were synthesized using a heat-treatment process. The internal and morphological characteristics of hexagonal Star ZIF-8 were investigated using scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrochemical sensor with a good response to Cd(II) was prepared via square-wave anodic stripping voltammetry (SWASV) with Star ZIF-8 nanomaterial-modified glassy carbon electrodes. The main parameters were adjusted to obtain the optimal stripping response and a wide linear range. Concurrently, under the calculation of SWASV, the sensitivity of Star ZIF-8-Nafion/GCE to Cd(II) was increased by five orders of magnitude (0.5–230 μg/L), and the determination level was even low to 0.48 μg/L. Based on the high anti-interference ability and stability of the sensor, the application potential of Star ZIF-8 carbon-based metal-free nanomaterials for the detection of trace Cd(II) in was confirmed.
研究领域:
材料科学
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环境科学
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分析化学
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DOI
PubMed
高影响因子
Current Analytical Chemistry
·
2024
·Vol. 21
·期 8
·1005-1012
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IF 1.7
Jiangxiong Zhu,Yang Wang,Lumei Wang,Xueqing Geng,Linnan Yang,Ting Zhao,Yun Deng
ObjectiveThe objective of this study is to develop a novel fluorometric aptasensor employing fluorescence resonance energy transfer (FRET) for the detection of Cadmium (II) (Cd2+) in water and food samples. The constructed aptasensor employed a fluorophore-quencher labeled aptamer combination not previously reported for Cd2+ detection. Additionally, its simple mix-and-detect pattern without immobilization or material-assisted steps represented an innovative design.MethodsUtilizing 6-carboxyfluorescein (FAM)-modified aptamers and maleimide (BHQ-1)-modified aptamer complementary chain to construct a fluorescent detection probe, this aptasensor achieved a rapid, sensitive, and selective detection of Cd2+. Without Cd2+, the aptamer and its complementary strand undergo base pairing, bringing the FAM closer to the BHQ-1, and leading to FRET and a subsequent decrease in fluorescence intensity. The introduction of Cd2+ preferentially brought to the aptamer, changing its conformation and preventing the quenching of FAM by BHQ-1, thereby restoring the fluorescence intensity of the aptasensor.ResultsFollowing optimization of experimental parameters, the aptasensor exhibited a linear response to Cd2+ concentrations ranging from 5 to 1200 nM, with a detection limit (LOD) of 0.43 nM. The aptasensor’s performance was unaffected by the presence of various ions, indicating its high specificity. Moreover, it could rapidly and accurately detect Cd2+ in water and food samples, including tap water, lake water, grapes, cabbage, and broccoli, demonstrating its substantial potential for practical application.ConclusionTherefore, the developed aptasensor represents an important tool for effective Cd2+ detection in water and food matrices, highlighting its potential as a critical tool for environmental monitoring and food safety.
研究领域:
环境监测
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食品安全
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分析化学
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生物传感器
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重金属检测
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Yanyan Niu,Hui Xie,Guiling Luo,Yujiao Zhuang,Xianqun Wu,Guangjiu Li,Wei Sun
In this paper a photoelectrochemical (PEC) aptasensor based on specific recognition with conformational changed after the target Cd(II) identification was fabricated. A ZnO and reduced graphene oxide (ZnO-rGO) nanocomposite with enhanced PEC activity was designed as photoactive material. After the further incorporation of gold nanoparticles (AuNPs) with ZnO-rGO nanocomposite, the enhanced photocurrent signal could be detected owing to the localized surface plasmon resonance and good conductivity of AuNPs. In addition, AuNPs were used as anchors for immobilization of –SH modified aptamer S1. After that aptamer S2 was paired with S1 sequence to form complementary double stranded DNA (dsDNA) on the electrode surface. Methylene blue (MB) was acted as sensitizer and assembled in dsDNA structure to amplify photocurrent response. When Cd(II) was bound to the aptamer presented on the sensing interface, S2 specifically recognized and captured Cd(II), which resulted in the unwinding of dsDNA structure and the separation of MB molecules from the electrode surface with photocurrent response decreased. The photocurrent was detected by a double-working-electrode system, which used the modified electrode as the first working electrode and glassy carbon electrode (GCE) as the second working electrode. Dopamine (DA) was added to the electrolyte and acted as the electron donor , which could be oxidized on the modified electrode and reduced on the GCE to form a cyclic reaction, leading to the enhanced photocurrent response with improved photocurrent stability. This MB sensitized PEC aptasensor exhibited a high sensitivity with a detection limit of 1.8 × 10 −12 mol/L (3σ). Thus, a highly sensitive aptasensor with double-working-electrode detection method for Cd(II) determination were established and further applied to the water samples analysis.
研究领域:
环境科学
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分析化学
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纳米技术
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电化学
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DOI
PubMed
高影响因子
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