MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Haijun Du,Dexiang Wang,Yu Duan,Minkang Hu,Shengnan Li,Wen Yang,Jun Feng
Since exogenous plant hormones are often employed in agriculture, it is necessary to build a sensitive electrochemical sensor to monitor their residues. This paper describes a flower-like tin disulfide (SnS 2 ) flakes using a hydrothermal method, was loaded onto a carbonized eggshell membrane (CESM). The SnS 2 /CESM composite was subsequently drop-coated onto a glassy carbon electrode (GCE), resulting in the successful construction of an electrochemical sensor (SnS 2 /CESM/GCE) for the detection of maleic hydrazide (MH). The designed sensor demonstrates a wide linear range of 0.1 ∼ 25 µM and 25200 µM, and a low detection limit of 0.0386 µM. Mechanistic studies indicates the electrochemical reaction of MH on SnS 2 /CESM/GCE is controlled by adsorption, which two protons and two electrons are participated in the electrochemical oxidation process. The proposed sensor demonstrated good repeatability and reproducibility, with relative standard deviations (RSDs) of 3.83 % and 2.39 %, respectively. Common interferences had no effect on the detection of MH, with an RSD of 3.16 %. The spiking recovery approach yielded recoveries of MH in tobacco ranging from 94.60 % to 107.60 %. This suggests that the SnS 2 /CESM/GCE sensor has a promising future in agriculture for the quick detection of exogenous phytohormones.
研究领域:
农业科学
·
分析化学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2013
·
IF 1.977
Can Wang,Huaimin Gu,Meng Lv,Ruoyu He,Juling Zhang
In this paper, surface-enhanced Raman scattering (SERS) spectra of maleic hydrazide (MH, 6-hydroxy-3(2H)-pyridazinone) were studied by using citrate-reduced gold colloidal nanoparticles. Comparisons between the prominent SERS bands and the precise mode descriptions predicted through density functional theory (DFT) simulations at the B3LYP/6-311++g(d,p) level allowed an in-depth orientation analysis of the adsorbed species on gold surfaces. And main forms of hydrogen bonds in the solid state of MH were also determined to be O H⋯O. Furthermore, the effects of concentration and pH on the SERS spectra of the molecule were discussed. It is found that with the different adsorbate concentration, the SERS spectra of MH show significant changes in their features, indicating different orientations and adsorption sites of the molecule on the gold colloidal surface. The SERS and absorption spectra under different pH conditions show that a basic environment leads to the deprotonation of N2 and the nearly parallel orientation of the MH molecule on the gold surface. Moreover, the enhanced characteristic bands were observed at MH concentrations down to about 1 ppm with the gold colloids, demonstrating a potential of the technique in the analysis of MH residues.
研究领域:
分析化学
·
光谱学
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Xiaolong Fu,Bihang Su,Jinhua Xu,Cheng Pan,Shuping Huang,Fengfu Fu,Zhenyu Lin,Yongqiang Dong
Maleic hydrazide (MH) is a commonly used plant growth regulator and herbicide. However, due to its potential mutagenicity, carcinogenicity, genotoxicity, and cytotoxicity, sensitive and rapid detection of MH residues in foods is crucial. Herein, a sensitive and reliable surface-enhanced Raman scattering (SERS) sensor for MH based on a self-constructed hydrogel SERS platform is proposed for the first time. The used hydrogel SERS chips contain aggregated Ag nanoparticles (a-AgNPs). Under the irradiation of 785 nm laser, the a-AgNPs provide a large quantity of plasmonic hots to produce strong electromagnetic enhancement. Thus, strong SERS signal of MH can be gained on the hydrogel SERS platform. In addition, the unique network structure of hydrogel greatly improves the anti-interference ability to the complex sample matrix. As a result, the developed SERS sensor for MH shows the advantages of high sensitivity (a low detection limit of 50 ppb), fast response (10 min), and high selectivity. The reliability of the sensor is supported by the satisfactory recoveries of 92.80 – 105.6 % in actual samples (tea and potato). The constructed SERS sensor provides a promising approach for rapid on-site testing of MH residues.
研究领域:
食品安全
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分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Feng He,Lingling Guo,Liqiang Liu,Xinxin Xu,Chuanlai Xu,Hua Kuang,Maozhong Sun
Maleic hydrazide (MH), a selective herbicide and plant growth inhibitor, poses risks to ecological balance and human health due to its widespread use. In this study, we developed a simple, reliable, and rapid detection method for MH. Four haptens were analyzed using computational chemistry simulations, and a matrix effect-enhanced screening method was used to obtain the anti-MH monoclonal antibody, with a half-maximal inhibitory concentration (IC 50 ) of 0.157 μg/mL. An immunochromatographic assay was developed for detecting MH in lake water, soil, onion, garlic, potato, and tobacco samples. The IC 50 values ranged from 0.590 to 9.419 mg/kg, with a detection limit of 0.047–1.614 mg/kg. Spiked recovery and real sample analyses demonstrated results consistent with instrumental methods, achieving recoveries of 89.2 %–111.3 % and CV < 7 %. These findings confirm the method's suitability for detecting MH in food and environmental samples, fulfilling the requirements for on-site rapid detection in resource-limited settings.
研究领域:
分析化学
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计算化学
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免疫学
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 39
·4662-4673
·
IF 2.896
Lulu Xu,Ruimei Wu,Xiaoyu Zhu,Xiaoqiang Wang,Xiang Geng,Yao Xiong,Tao Chen,Yangping Wen,Shirong Ai
A simple electrochemical sensing platform based on a low-cost disposable laser-induced porous graphene (LIPG) flexible electrode for the intelligent analysis of maleic hydrazide (MH) in potatoes and peanuts coupled with machine learning (ML) was successfully designed. The LIPG electrode was patterned by a simple one-step laser-induced procedure on commercial polyimide film using a computer-controlled direct laser writing micromachining system and displayed excellent flexibility, 3D porous structure, large specific surface area, and preferable conductivity. A data partitioning technique was proposed for the optimal MH concentration ranges by selecting the size of datasets, including the size of the training set and the size of the test set combined with the performance metrics of ML models. Different algorithms such as artificial neural networks (ANN), random forest (RF), and least squares support vector machine (LS-SVM) were selected to build the ML models. Three ML models were evaluated, and the LS-SVM model displayed unique superiority. Both the recoveries and RSD of practical application were further measured to assess the feasibility of the selected LS-SVM model. This will have important theoretical and practical significance for the intelligent analysis of harmful residuals in agro-product safety using an electrochemical sensing platform.
研究领域:
食品科学
·
分析化学
·
人工智能
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-12
·
IF 5.479
Sheng Yingying,Qian Wenbin,Huang Jianping,Wu Binglong,Yang Jun,Xue Ting,Ge Yu,Wen Yangping
A method for intelligent data analysis was designed by combining electrochemical sensing with machine learning (ML). Specifically, a voltammetric sensor is described for determination of the phytoinhibitor maleic hydrazide in crop samples. Carboxyl-functionalized poly(3,4-ethylenedioxythiophene) (PEDOT-C4-COOH) was electro-synthesized in aqueous micellar solution by direct anodic oxidation of its monomer. A nanosensor was then prepared by placing copper nanoparticles (CuNPs) on the PEDOT-C4-COOH film via electro-deposition of Cu (II) from aqueous micellar solutions. An artificial neural network (ANN) served as a powerful ML model to realize intelligent data analysis and smart transformation for digital output. Different established regression methods were selected for evaluating the ANN-based method that was found to be superior to known methods. The sensor has a wide working range (from 0.06–1000 μM), a low limit of detection (10 nM), good stability, selectivity and practicality. The method was applied to the determination of maleic hydrazide in (spiked) samples of onion, rice, potato and cotton leaf. Satisfactory results demonstrate that the feature of simultaneous data acquisition and analysis is highly attractive.
Schematic representation of an electrochemical sensor based on carboxyl-functionalized poly(3,4-ethylenedioxythiophene) (PEDOT-C4-COOH) and copper nanoparticles (CuNPs) by differential pulse voltammetry (DPV) to detect maleic hydrazide (MH). PEDOT-C4-COOH was electro-synthesized in 0.1 M LiClO 4 aqueous micellar solution with 0.1 M sodium dodecyl benzene sulfonate (SDBS) by amperometry (CA). CuNPs was prepared by cyclic voltammetry (CV).
研究领域:
分析化学
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机器学习
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Yu Ge,Minghui Li,Ying Zhong,Lulu Xu,Xinyu Lu,Jiaqi Hu,Quanming Peng,Ling Bai,Yangping Wen
With the assistance of machine learning (ML), black phosphorene (BP) stabilized by silver nanoparticles (AgNPs) is used to modify halloysite nanotube (HNT) to obtain highly conductive nanomaterials, HNT/BP-AgNPs, which are morphologically characterized and elementally analyzed. Artificial neural network (ANN) and least squares support vector machine (LS-SVM) are adopted for the intelligent and rapid analysis of maleic hydrazide (MH). An ultra-portable electrochemical sensor bases on HNT/BP-AgNPs modifying screen-printed carbon electrode (SPCE), smartphone and mini-palm potentiostat for detection of MH in the linear range 0.7–55 μM with limit of detection (LOD) of 0.3 μM. For comparison, a traditional electrochemical sensor is fabricated by glass carbon electrode (GCE), desktop computer and large electrochemical potentiostat, and the linear range is 0.3–600 μM with low LOD of 0.1 μM. The ultra-portable electrochemical sensor combined with ML for the detection of MH in sweat potato and carrot gain satisfactory recoveries.
研究领域:
电化学
·
纳米技术
·
机器学习
·
分析化学
·
环境科学
·
农业化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Jiadan Zhang,Baiwen Wei,Jingwen Zhang,Pengzhao Wang,Jiefeng Rong,Fengfu Fu,Zhenyu Lin,Yongqiang Dong
Surface enhanced Raman scattering (SERS) hydrogel substrates face limitations in chemical enhancement (CM) due to the single-metal Fermi level, restricting analyte detection. Herein, negatively charged silver nanoparticles (AgNPs) and positively charged gold nanoparticles (AuNPs) were engineered into bimetallic hydrogel substrates (AgNPs@AuNPs-chips). The obtained AgNPs@AuNPs-chips exhibited a strong localized surface plasmon resonance (LSPR) peak matching the 785 nm laser for significant electromagnetic (EM) enhancement, while the dual Fermi levels (−4.26 eV for Ag, −5.10 eV for Au) enabled more photo-induced charge transfer (PICT) pathways for CM. Compared to monometallic AgNPs-chips with similar LSPR properties, the bimetallic chips demonstrated better synergistic EM/CM effects for some molecules. When applied to detect maleic hydrazide (MH), the chips achieved a limit of quantitation of 10 ppb, surpassing prior AgNPs-chip methods (100 ppb). Successful quantitative analysis of MH in real-world samples with good recovery demonstrated the substrate's practicality. This work pioneers dual-Fermi-level colloidal interfacial design, expanding SERS applicability in food safety.
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Jinhan Zhang,Yihui Chen,Meilin Ni,Chunyan Hou,Xiaoqiang Qiao,Tingting Wang
The accurate determination of polar cationic pesticides in food poses a challenge due to their high polarity and trace levels in complex matrices. This study hypothesized that the use of halloysite nanotubes (HNTs) can significantly enhance the extraction efficiency and sensitivity of these analytes because of their rich hydroxyl groups and cation exchange sites. Therefore, we chemically incorporated HNTs with organic polymer monoliths for in-tube solid-phase microextraction (SPME). This novel hybrid monolith extended service life, improved adsorption capacity, and exhibited excellent extraction performance for polar cationic pesticides. Based on these advancements, a robust and sensitive in-tube SPME-HILIC-MS/MS method was constructed to determine trace levels of polar cationic pesticides in complex food matrices. The method achieved limits of detection of 1.9, 2.1, and 0.1 μg/kg for maleic hydrazide , amitrole , and cyromazine , respectively. The spiked recoveries in five food samples ranged from 80.2 to 100.8%, with relative standard deviations below 10.7%.
研究领域:
分析化学
·
食品科学
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产品关联
DOI
PubMed
高影响因子
SYNTHETIC METALS
·
2015
·
IF 2.252
Hui Zhang,Jingkun Xu,Yangping Wen,Zifei Wang,Jie Zhang,Wanchuan Ding
A novel poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) composite film with superior stability in water, adhesion and flexibility, which is very critical for maintaining the long-term stability in water of the PEDOT:PSS film electrode, was easily prepared by introducing a water-soluble, anionic, non-toxic and biocompatible biopolymer (sodium carboxymethyl cellulose, Na-CMC) into a commercially available aqueous dispersion of the conducting polymer (PEDOT:PSS dispersion). The high conducting PEDOT:PSS-CMC film exhibited good flexibility and long-term stability in water after being soaked in water for 35 days. The high performance film electrode with excellent adhesion, long-term electrode stability in water (retaining almost 99.4% of its original activity for 105 days), and electrochemical properties was prepared facilely by drop-coating, and displayed good synergistically enhanced electrocatalytic ability towards the anodic oxidation of harmful substances and nutritional ingredients in edible agro-products, which were employed for its application in electrochemical sensors. The simultaneous or individual detection of maleic hydrazide, salicylic acid, nitrite, sunset yellow, and tryptophan was successfully realized using PEDOT:PSS-CMC/GCE, and exhibited superior sensing stability. All satisfactory results indicated that the introduction of CMC into PEDOT:PSS could improve the flexibility, adhesion, long-term electrode stability in water and electrocatalytic ability, which would provide a promising platform for the application in electrochemical fields of the high performance film electrode, especially the application in electrochemical sensors.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yu Zhou,Xinyu Song,Shenggang Yan,Chunhua Ni,Li Xu,Liangmin Yu,Xia Li
Biomass-derived carbon has attracted extensive attention because of its unique form, wide range of sources and low cost. However, the construction of efficient biomass-based microwave absorbers with hierarchical structures and multicomponent magnetic/dielectric structures remains a great challenge. Therefore, CoNi-MOF was self-assembled in situ on the plant Juncus effusus by the microwave method, and CoNi/NC/C composites were prepared by in situ pyrolysis in a nitrogen atmosphere. The morphology, electromagnetic parameters, specific surface area and porous structure of the composites were adjusted by controlling the pyrolysis temperature. For a pyrolysis temperature of 600 ℃ and filling of 16 wt%, the composite was found to show an RL min value of − 64.3 dB at 12.88 GHz at a thickness of 2.5 mm, and the effective absorption bandwidth (EAB)reached 7.36 GHz. The excellent microwave absorption performance was attributed to conduction loss, dipole polarization, interface polarization, magnetic loss and balanced impedance matching.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 16
·12237-12247
·
IF 3.84
Zifei Wang,Zhipeng Wang,Hui Zhang,Xuemin Duan,Jingkun Xu,Yangping Wen
A novel and simple strategy to prevent swelling, disintegration, cracking and peeling-off of poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) film in water was developed. This strategy was based on the film of a conducting polymer, poly(acrylic acid modified EDOT-co-EDOT):PSS (poly(EDOT-co-EDOT-AA):PSS). The film had high soaking stability, good adhesive ability, and high flexibility, which are crucial to maintaining long-term electrode stability in water of the PEDOT:PSS film. The most widely studied novel carbon nanomaterial, graphene, and a unique and versatile clay nanomaterial, halloysite, were introduced into poly(EDOT-co-EDOT-AA):PSS aqueous dispersion to prepare organic polymer–inorganic nanocomposites. Use of poly(EDOT-co-EDOT-AA):PSS film and its composite films as electrode coatings enabled long-term high performance of the film electrodes and provided high electrode stability and high adhesive ability. The structure, optical, flexibility, conductivity properties and morphology of poly(EDOT-co-EDOT-AA):PSS and its composites were systematically investigated. The performance of poly(EDOT-co-EDOT-AA):PSS film and its composite films, and their electrodes in sensing applications was also evaluated. The as-prepared electrochemical electrodes displayed high electrocatalytic activity in the detection of epinephrine, tryptophan, maleic hydrazide, and vitamin B6, as well as high sensing stability. The results indicated that poly(EDOT-co-EDOT-AA):PSS and its composites had potential applications for various electrode coatings.
研究领域:
材料科学
·
生物医学工程
·
电化学
✓ 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）