ANALYTICA CHIMICA ACTA
·
2012
·
IF 4.555
Dongyue Li,Jing Li,Xiaofang Jia,Yanchao Han,Erkang Wang
A simple, rapid and sensitive sensing platform for the detection of As(III) has been fabricated in neutral media based on the mercaptoethylamine modified Au electrode. A wide detection range of 0.2–300 μg L −1 and a low detection limit of 0.02 μg L −1 were obtained with a preconcentration time of 100 s under optimal conditions. Compared with previous studies, this work shows obvious advantages that it not only suppresses the Cu(II) interference, but also can detect the As(III) in natural water samples at the original pH avoiding high concentration acidic media. Moreover, the practical application of the proposed method was verified in the lake water sample determination.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Huan He,Pan Li,Xianghu Tang,Dongyue Lin,Anjian Xie,Yuhua Shen,Liangbao Yang
In this paper, we developed cysteamine-modified surface-enhanced Raman scattering (SERS) substrate for detecting detect trace amount of acidic pigment that shows weak affinity with gold nanoparticles (Au NPs). To realize sensitive and reproducible detection of pigment with weak affinity, the SERS substrate was prepared by attaching cysteamine (CA) to the Au NPs, the acidic pigment molecule could rapidly reached to the surface of Au NPs because of the formation of multi‑hydrogen-bond and electrostatic interaction between the pigment and CA molecule. The proposed method allowed us to detect five kinds of acidic pigment with a limit of 1.0 ppm, which is below the strictest safety limit. Compared with the previous methods, the advantages of the present substrate were its simple substrate preparation, high reproducibility and good universality. Furthermore, the reliable and enough accurate results had been obtained by using of the proposed substrates in the assay of trace pigment in real samples.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2025
·
IF 8
Nisar Hussain,Yuzhu Li,Ning Li,Abid Hussain,Manzoor Hussain,Mengke Su,Honglin Liu
Surface-enhanced Raman scattering (SERS) is an emerging swift and nondestructive detecting method, offering a unique structural signature of analytes down to ultrasensitive levels. Herein, we present a novel SERS-based core-shell nanostructure with optimized silver shell thicknesses, capped with 2-mercaptoethylamine (2-MCE), to simultaneously detect multiple agrochemical residues in fruit samples. Compared to unmodified Au@AgNPs, the modified Au@Ag@2-MCENPs integrated with SERS exhibited improved sensitivity and stability, exhibiting a strong relationship between the SERS intensities and pesticide concentrations in the fruit samples, with LODs of 0.006 and 0.008 ppm for thiacloprid and 0.007 and 0.009 ppm for oxamyl in pear and apple fruit samples, respectively. Moreover, the method showed satisfactory recoveries ranging from 80 % to 106.5 % for thiacloprid and 81.8 % to 110.2 % for oxamyl in both fruit samples. Furthermore, this method presented rapid and simultaneous detection capabilities, significantly reducing analysis time compared to traditional methods, making it suitable for detecting other toxic chemical residues in agricultural products.
研究领域:
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 4
·2433-2443
·
IF 5.044
Zhou Yihang,Wang Kai,Hu Dongbo
A previous study on consolidation of waterlogged archaeological wood (WAW) via surface initiated ARGET ATRP of the cell walls has shown its potential of maintaining the dimensional stability. But the defects lie in the unsuitable initiator immobilization methods and polymerization conditions, which impedes its application. Therefore, we are proposing a novel functionalization method for initiator immobilization in water or water/ethanol solution and an improved thermo-initiated ARGET ATRP system. First, mercaptoethylamine (MEA) was used to functionalize WAW with amino groups in water under circumneutral conditions. Then, quinone-based initiators reacted with those amino groups realizing its immobilization. Finally, by using less active reductants such as ascorbic acid 2-glucoside and glucose, monomer, catalyst, and reductant were able to permeate into the WAW samples at room temperature and polymerization was initiated by heating to 60 °C (for ascorbic acid 2-glucoside) or 80 °C (for glucose). Both satisfying uniformity and dimensional stability (77.0–85.1% ASE) can be achieved through the described approach. Moreover, the described functionalization methods may also provide reference for WAW consolidation material designs and applications in other lignocellulosic materials in the future.
研究领域:
考古学
·
高分子科学
·
文物保护科学
✓ 已验证
产品关联
DOI
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2021
·
IF 4.232
Yuan Yang,Xin Liu,Lin Luo,Wenjing Wei,Qiang Wang,Jiachao Zhang
The increasing usage of zinc oxide nanoparticles (ZnONPs) inevitably leads to their release into the environment. To understand their fate and toxicity in water systems, a reliable method for the quantitative analysis of ZnONPs in environmental waters is urgently needed to be established. In this study, a quantitative analytical method of ZnONPs in environmental waters was developed by cloud point extraction (CPE) combined inductively coupled plasma mass spectrometry (ICP-MS). To obtain high recoveries of ZnONPs, the CPE parameters including pH, surfactant concentration, salt concentration, bath temperature, and time were optimized. The results demonstrated that the addition of β-mercaptoethylamine could significantly reduce the interference of Zn2+ on the extraction of ZnONPs, while the CPE approach was not affected significantly by the typical environmental inorganic ion and ENMs (such as Au, TiO2, and Al2O3). The extraction method of ZnONPs with different diameters was also assessed, and satisfactory extraction efficiency was obtained. The results of ZnONP concentration in collected environmental water were in the range of - μg/L. And the recoveries of ZnONPs in different environmental waters were - at low concentration spiked levels (12.57-54.68 μg/L), demonstrating that it is efficient to extract trace ZnONPs from real environmental waters. This established method offered a reliable method for the quantitative determination of ZnONPs in environmental waters, which could further promote the study of the environmental behavior, fate, and toxicity of ZnONPs in an aqueous environment.
研究领域:
环境科学
·
分析化学
·
纳米技术
·
水质
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Xuan He,Xin Xie,Juan Xiang,Minghui Yang
Chemical recycling is a promising approach to reduce plastic pollution. Timely and accurate size analysis of produced nanoplastics is necessary to monitor the process and assess the quality of chemical recycling. In this work, a sandwich-type microelectrode sensor was developed for the size assessment of nanoplastics. β-Mercaptoethylamine was modified on the microelectrode to enhance its surface positive charge density. Polystyrene (PS) nanoplastics were captured on the sensor through electrostatic interactions. Ferrocene was used as an electrochemical beacon and attached to PS via hydrophobic interactions. The results show a nonlinear dependence of the sensor’s current response on the PS particle size. The size resolving ability of the microelectrode is mainly attributed to the small size of the electrode and the resulting attenuation of the electric field strength. For mixed samples with different particle sizes, this method can provide accurate average particle sizes. Through an effective pretreatment process, the method can be applied to PS nanoplastics with different surface properties, ensuring its application in evaluating different chemical recycling methods.
研究领域:
环境科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 9
·1-8
·
IF 5.479
Gao Wanru,Li Pao,Qin Si,Huang Zhao,Cao Yanan,Liu Xia
A method is reported for in-situ detection of the antibiotic tetracycline (TC). It is based on a combination of extraction of TC by magnetic molecularly imprinted polymers nanoparticles (MMIPs NPs) and detection by surface plasmon resonance (SPR). The TC-captured MMIPs NPs were flowed over the surface of the SPR chip that was modified with mercaptoethylamine. The SPR signal undergoes a strong increase through the use of MMIPs NPs. It increases linearly in the 5.0–100 pg·mL −1 TC concentration range, and the detection limit is as low as 1.0 pg·mL −1 (at S/N = 3). This method shows selectivity to TC compared with structurally analogues. In order to demonstrate the power of the method, it was applied to the analysis of milk spiked with TC. These results were validated by comparing them to those of an enzyme-linked immunoassay. The average recovery is in the range of 95.7–104.6%.
Schematic representation of a surface plasmon resonance assay for the sensitive determination of tetracycline in milk using the magnetic molecularly imprinted polymers nanoparticles that can extract tetracycline and amplify the SPR signal.
研究领域:
分析化学
·
纳米技术
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2012
·Vol. 1
·期 7
·2558-2566
·
IF 0
Essy Kouadio Fodjo,Da-Wei Li,Niamien Paulin Marius,Trokourey Albert,Yi-Tao Long
AgxMoyOz (Ag/α-MoO3, Ag/h-MoO3, Ag/β-MoO3, Ag2Mo2O7, and Ag2MoO4) nanomaterials are synthesized at relatively low temperature (80 °C) and with a short hydrothermal treatment time (3 h) using glucose (Glc) as a catalyst. Contrary to previous studies, it is possible to synthesize one of the AgxMoyOz binaries at 80 °C by altering the pH of the reaction media in the presence of glucose. In addition, further experiments indicate that Ag/h-MoO3, Ag2Mo2O7 and Ag/β-MoO3 can be converted to Ag/α-MoO3 which can also be synthesized from a reaction involving ammonium heptamolybdate tetrahydrate and AgNO3 at room temperature using cysteamine in both methods. Characterization with UV-Vis, XRD and Raman spectroscopy reveals high purity of as-synthesized product. These synthesized products are finally used to fabricate SERS substrates by coating a silicon wafer with a mixture of silver nanoparticles (Ag NPs) and AgxMoyOz (Si@Ag/AgxMoyOz). The results show a good sensitivity and stability. In addition, it is also found that the SERS activity of Si@Ag/AgxMoyOz is higher than that of Si@Ag.
研究领域:
材料科学
·
纳米技术
·
表面增强拉曼光谱
·
化学合成
✓ 已验证
产品关联
DOI
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 16
·8399-8406
·
IF 3.269
Longgang Wang,Qinghua Yang,Yanshuai Cui,Dawei Gao,Jianxin Kang,Haotian Sun,Linlin Zhu,Shengfu Chen
The development of stable and biocompatible gold nanoparticles has been drawing great interest. Dendrimers could be used as templates to entrap gold nanoparticles. Herein, dendrimer templates were prepared by the modification of generation 5 polyamidoamine (G5 PAMAM) dendrimers with maleic anhydride and cysteamine. Then modified dendrimer-encapsulated gold nanoparticles (Au-G5MC NPs) were formed by incubation of the templates with chloroauric acid and reduction with sodium borohydride. The resulting Au-G5MC NPs showed high stability, biocompatibility, and catalytic efficiency in water, which is ascribed to the single zwitterionic layer composed of amine and carboxyl groups. The single zwitterionic layer was shown to provide the Au-G5MC NPs with excellent stability in both phosphate-buffered saline and fibrinogen solutions. The mixed solution of Au-G5MC NPs with fibrinogen remained stable within 24 h, while the mixed solution of G5 PAMAM dendrimer-entrapped gold nanoparticles (Au-G5 NPs) with fibrinogen formed obvious aggregates immediately. Au-G5MC NPs displayed little cytotoxicity (>90% cell viability) against HeLa cells up to 100 μg mL−1, while Au-G5 NPs showed obvious cytotoxicity (60% cell viability). In addition, Au-G5MC NPs displayed high catalytic efficiency for the reduction reaction of 4-nitrophenol (4-NP) in water. This method can be used to prepare a variety of highly stable, biocompatible, and efficient dendrimer-encapsulated catalysts.
研究领域:
纳米技术
·
材料科学
·
催化
·
生物医学工程
✓ 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）