FOOD CHEMISTRY
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2024
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IF 8.5
Yuting Guan,Siyu Wang,Guanghua Lei,Zikang Hu,Hengye Chen,Huiwen Gu,Xiaoli Yin,Yuanbin She,Wanjun Long,Haiyan Fu
Enshi Yulu green tea (ESYL) is the most representative traditional steamed green tea in Enshi, Hubei. Different ESYL grades exhibit distinct flavors, tastes, and prices. In this study, a visual sensor based on 4-MPBA Au@AgNPs was developed for the rapid and accurate identification of ESYL grades. The recognition mechanism involved the binding of 4-MPBA Au@AgNPs with polyphenolic compounds in ESYL to form borate esters and the conversion of Ag + to Ag 0 , with the generated Ag 0 depositing on the surface of 4-MPBA Au@AgNPs. The results showed that the sensor can amplify the color differences of different grades of ESYL. The visual results were also validated by the partial least squares discriminant analysis model, demonstrating an enhancement in recognition accuracy from 68.2 % to 95.5 % compared to the original extraction solution. The colorimetric sensor developed in this study is expected to provide a new approach for traceability research of other foods.
研究领域:
食品科学
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分析化学
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纳米技术
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Xiaojie Shi,Huimin Liu,Mei Zhang,Fengzhen Yang,Jiansen Li,Yemin Guo,Xia Sun
An ultrasensitive aptasensor based on luminol-hydrogen peroxide (H 2 O 2 ) electrochemiluminescence (ECL) system was proposed for determination of profenofos. AuNPs decorated with MWCNTs ( [email protected] ) were used to provide a favorable microenvironment for luminol loading and improve the ECL signal due to their good biological activity, excellent electrical conductivity and high specific surface area. Gold and silver core-shell nanoparticles ( [email protected] ) could act as effective catalyzer to accelerate H 2 O 2 decomposition to produce various intermediate reactive oxygen species for signal amplification and thus increased the ECL signal again. Under optimal conditions, the proposed ECL aptasensor obtained an extremely low detection limit of 5.32 fg/mL (S/N = 3) with a good detection range from 100 fg/mL to 1 μg/mL. Moreover, the proposed aptasensor had excellent specificity, outstanding repeatability and favorable stability. Finally, the proposed ECL aptasensor was used for the detection of profenofos in real samples and the recoveries ranged from 94% to 102%. This strategy could provide a good reference for developing effective aptasensors for detection of other small molecules and toxins.
研究领域:
分析化学
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环境科学
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纳米技术
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DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2020
·Vol. 101
·期 9
·3595-3604
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IF 2.614
Ting-tiao Pan,Wang Guo,Ping Lu,Deyu Hu
BACKGROUND Pesticide residues in agricultural products and foods pose a serious threat to human health, and therefore a simple, rapid and direct method is urgently needed for pesticide residue detection. In addition to realizing the detection of acetamiprid in cabbage extract solution, the main target of this study was to establish an in situ surface-enhanced Raman scattering (SERS) method, which could directly detect acetamiprid residue on cabbage leaf without the need for extraction. Acetamiprid was first used to contaminate the surface of fresh cabbage leaf, and then bimetallic silver-coated gold nanoparticles (Au@AgNPs) were added on the contaminated spots and dried for SERS measurement. RESULTS Results suggested that acetamiprid can be detected in cabbage extract and on cabbage leaf surface in situ using the SERS method based on the Au@AgNPs substrate. The limit of detection was 0.08 μg mL −1 in cabbage extract and 0.14 mg kg −1 on cabbage leaf, the recovery ranged from 80.5% to 105.5% and the relative standard deviation was in the range 4.37–10.63%. CONCLUSIONS The proposed SERS method provides an in situ , nondestructive and rapid way to detect acetamiprid residue on the surface of fruits and vegetables, which could serve as an auxiliary approach for early screening of contaminated produce in field or on site in the future. © 2020 Society of Chemical Industry
研究领域:
分析化学
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食品科学
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环境科学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Haiyun Zhai,Haihang Wang,Shiqiao Wang,Zuanguang Chen,Shumei Wang,Qing Zhou,Yufang Pan
A novel Au-Ag nanoparticles (NPs) on multi-walled carbon nanotubes/sulfonated graphene sheets modified glassy carbon electrode (Au-AgNPs/MWNTs-SGSs/GCE) was prepared to determine mangiferin (MIN) and icariin (IIN) by electrochemical methods Scanning electron microscopy and energy-dispersive spectroscopy showed that Au-AgNPs were electrodeposited on drape and tubular structure of MWNTs-SGSs/GCE successfully. The modified electrode had high electroactivities against both MIN and IIN. The anodic peak currents of MIN and IIN on the GCE modified by Au-AgNPs/MWNTs-SGSs were much higher than those on the bare GCE. Differential pulse voltammetry showed a wide detection range of 0.05 ∼ 500.0 μM for MIN and 0.05 ∼ 100.0 μM for IIN, with low detection limits (0.017 μM both) as well as high sensitivity, selectivity and repeatability. Au-AgNPs/MWNTs-SGSs/GCE was successfully applied to simultaneously detect MIN and IIN in Rhizoma anemarrhenae and to independently determine MIN in Artemisia capillaris Herba and IIN in the leaves of Epimedium macranthum .
研究领域:
分析化学
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药理学
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纳米材料科学
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DOI
高影响因子
FOOD CHEMISTRY
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2020
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IF 6.306
Abid Hussain,Da-Wen Sun,Hongbin Pu
Existing methods for contaminants detection in liquid milk are complex, requires chemicals and time-consuming experimental procedure. In this study, SERS based on bimetallic core shelled nanoparticles was employed for simultaneous and fast detection of thiram and dicyandiamide (DCD) in the milk. Spectra ranging from 400 to 1700 cm −1 were selected to examine thiram (0.5, 1, 2, 5 and 10 ppm) and DCD (20, 40, 80,160 and 320 ppm), by employing 28 nm gold cores and silver-shell thickness of 8 nm. A strong peak at 1379 cm −1 was ascribed to thiram with LOD of 0.21 ppm and R 2 of 0.9896, whereas a band at 929 cm −1 was associated with DCD, delivering LOD of 14.88 ppm and R 2 of 0.9956. The proposed method could achieve results within 34 min and this ecofriendly method can be further employed for simultaneous and rapid screening of other accidental contaminants in milk.
研究领域:
分析化学
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食品科学
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环境科学
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DOI
PubMed
高影响因子
Plasmonics
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2023
·Vol. 18
·期 4
·1541-1552
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IF 3
Gu Ciyong,Meng Delong,Yu Xiaolei,Li Lin,Zhao Zhimin
In this work, we have developed a highly sensitive surface enhanced Raman scattering (SERS) substrate consisting of gold (Au) and silver (Ag) nanoparticles (NPs) loaded on glass fiber filter paper (GFF) by a two-step process of magnetron sputtering and sessile drop method. To test the SERS properties of the substrate, crystal violet (CV) was selected as the Raman probes. The influence of the amounts of NPs on the SERS signals was studied using field-emission scanning electron microscopy and theoretical methods. It is demonstrated that the hybrid structure of optimal GFF/Au/AgNPs has a much stronger SERS enhancement than that of GFF substrate coated only with AuNPs, which can provide a SERS enhancement factor (EF) of 3.52 × 10 8 , and the limit of detection is down to 10 −14 M for CV. Moreover, the Raman signal of the CV on the GFF/Au/Ag substrate presented good homogeneity, reproducibility and stability, also reproduce the SERS spectra after 15 days. Furthermore, the GFF/Au/AgNPs substrate was applied for the rapid on-site testing and identification of malachite green (MG) residual on contaminated fish scale, and the limit of detection was approximately 10 −7 M. Flexible GFF substrate with Au/Ag bimetallic hybrid structure has great potential in rapid sampling of hazardous ingredients on real samples and in SERS applications.
研究领域:
分析化学
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材料科学
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食品安全
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2026
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IF 5.2
Liqian Niu,Xian Wang,Xinxin Liu,Xin Guan,Xinyu Fan,Xin Liu,Shiyue Niu,Shuyun Bi
A novel UiO-66/Leu/Au@AgNPs SERS substrate was fabricated for chlorthiamid detection. • A low LOD of 1.95 × 10 −9 mol L −1 and wide linear range were obtained for chlorthiamid. • The sensor showed good stability, repeatability, and high anti-interference ability. • Good recoveries in real samples confirmed its practical use in food safety analysis. A novel surface enhanced Raman scattering (SERS) substrate, UiO-66/Leu/Au@AgNPs, was fabricated by assembling gold@silver core-shell nanoparticles (Au@AgNPs) with leucine (Leu) and the zirconium-based metal-organic framework (MOF) (UiO-66). Various techniques including SEM, TEM, HAADF-STEM, XRD, XPS, FT-IR, TGA, UV–Vis, and Zeta potential were employed to fully characterize the substrate of UiO-66/Leu/Au@AgNPs. The substrate of UiO-66/Leu/Au@AgNPs achieved remarkable Raman signal amplification for chlorthiamid. Both electromagnetic enhancement (EM) and chemical enhancement (CM) mechanisms significantly boosted the distinct and reproducible Raman signal of chlorthiamid. The determination of chlorthiamide was not interfered by fourteen types of pesticides and several common metal ions, demonstrating the good selectivity of this method. The linear regression equation was expressed as I SERS = 128.08 c + 288,613.27 ( R 2 = 0.9982), The linear range spanned three orders of magnitude (from 3 × 10 −9 to 1 × 10 −6 mol L −1 ). A low limit of detection (LOD) of 1.95 × 10 −9 mol L −1 was obtained. The proposed method was further utilized for the determination of chlorthiamid in real samples, giving recoveries between 96.4% and 105% ( n = 5). Download: Download high-res image (118KB) Download: Download full-size image
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DOI
高影响因子
Food Chemistry-X
·
2022
·
IF 6.443
Meiting Guo,Fang Wang,Wang Guo,Run Tian,Tingtiao Pan,Ping Lu
Pymetrozine is widely used in agriculture to control pests, and its residue may pose a threat to humans. In this study, the adsorption behavior of pymetrozine on Au@AgNPs surfaces in different solutions was investigated by calculation of ACD/Labs, density functional theory, UV–vis spectra, zeta potential and surface-enhanced Raman scattering. Then, a SERS method for detection of pymetrozine residues in apples was established based on the adsorption study. The results showed that pymetrozine was adsorbed on Au@AgNPs surface in different forms in various solutions and high SERS sensitivity of pymetrozine was obtained by the synergistic effect of pymetrozine, Au@AgNPs and NaOH. A simple SERS method has been established to detect pymetrozine in apples with a LOD of 0.038 mg/kg, linear range of 0.05–1.00 mg/kg, recovery of 71.93–117.49 % and RSD low than 11.70 %. This study provides a reference for rapid detection of pymetrozine in agricultural products.
研究领域:
分析化学
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食品安全
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纳米材料
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农药残留检测
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表面增强拉曼光谱技术
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DOI
高影响因子
ANALYTICAL CHEMISTRY
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2023
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IF 7.4
Huasheng Lai,Gongke Li,Zhuomin Zhang
Improving the speediness of complex sample analysis has attracted much research interest in analytical science. In this work, an enrichment-sensing all-in-one strategy was presented for rapid surface-enhanced Raman spectroscopy (SERS) analysis of purine components by using the La(OH)3-Au@AgNPs nanocomposite. Two-dimensional (2D) La(OH)3 nanosheets with nanothickness and accessible active sites not only acted as efficient media for the rapid enrichment of analytes but also provided flat planes for the intensive decoration of Au@AgNPs nanoparticles to amplify the SERS signals of adsorbed analytes. The nanocomposite could realize the rapid enrichment-sensing of purine components in 1 min, including mercaptopurine, thioguanine, adenine, and purine. Subsequently, the surface adsorption behaviors were explored by density functional theory and the enhancement mechanisms were simulated by the finite-difference time-domain method. Moreover, the nanocomposite also exhibited good SERS performances with relative standard deviations (RSDs) of uniformity less than 6.5% (n = 23), RSDs of batch-to-batch stability less than 7.3% (n = 9), and long-term stability over 9 weeks with RSDs within 6.6%. Finally, the enrichment-sensing strategy was applied for the rapid SERS analysis of two projects: mercaptopurine in tablets and adenine in beers with detection limits of 6.0 and 0.76 μg/L and spiked recoveries of 90.9–100 and 84.2–101%, respectively. Benefiting from the high-performance enrichment medium and closely packed plasmonic nanoparticles, the enrichment-sensing all-in-one strategy possesses great potential for rapid on-site detection in food safety and pharmaceutical analysis.
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PubMed
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 9
·1-14
·
IF 5.7
Mo Guichun,Qin Dongmiao,Wu Yusheng,Luo Zhi,Mo Keting,Deng Biyang
Abstract A new electrochemiluminescence (ECL) cytosensor is proposed for the simultaneous determination of phosphatidylserine (PS) and epidermal growth factor receptor (EGFR) based on the ECL signals of metal-organic framework-5 (MOF-5) loaded CdS quantum dots and N-(aminobutyl)-N-(ethylisoluminol)-polyethylenimine capped Au and Ag nanoparticles. Apoptosis promotes the exposure of PS and reduces the expression of EGFR in cell membranes. Two spatially resolved areas on dual-disk glassy carbon electrodes were designed to eliminate the interference from different ECL probes. Using HepG2 cells treated with resveratrol to induce apoptosis, the cytosensor exhibited high sensitivity, simplicity, and high reproducibility, demonstrating its potential in drug screening and rapid apoptotic cell detection. The strategy reported provides a promising platform for the highly sensitive cytosensing and convenient screening of clinically relevant anticancer drugs. Graphical Abstract
研究领域:
分析化学
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生物医学工程
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生物传感器
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癌症研究
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DOI
PubMed
高影响因子
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