FOOD CHEMISTRY
·
2024
·
IF 8.5
Nisar Hussain,Yuzhu Li,Cheng Qu,Ning Li,Honglin Liu
Simultaneous assessment of agrochemical residues in agricultural entities is crucial for ensuring food safety and protecting consumer health. A highly sensitive and stable thioglycolic acid (TGA) based surface modified coreshell nanorod (Au@Ag@TGANR) arrays were developed for simultaneous fungicide detection in peach samples. The developed Au@Ag@TGANRs exhibited superior surface enhance Raman scattering (SERS) performance, enabling the simultaneous examination of ziram (ZIR) and thiabendazole (TBZ) residues in peach samples with detection limits as low as 0.003 and 0.028 ppm and high R 2 values of 0.996 and 0.995, for ZIR and TBZ, respectively. Good recoveries of 86.2 to 108.6 % and 80.2 to 105.7 % were also achieved for peach samples, highlighting the effectiveness of the established protocol for accurate and reliable detection of pesticides in fruits. These results suggest that the proposed method could be a valuable addition to current food safety protocols, with potential application in investigating toxic residues in agricultural entities.
研究领域:
食品安全
·
分析化学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Yu Han,Xiaohui Fang,Zhoutao Sun,Chen Kang,Lei Zha,Xinping Zhang
Surface-enhanced Raman scattering (SERS) is a rapid and nondestructive spectroscopic method for trace detection. The enhancement based on both electromagnetic and chemical mechanism requires the molecules to be in close contact with the SERS-active material. Therefore, it is difficult to detect trace amounts of molecules in liquid directly. In this paper, graphene oxide (GO) and Ag nanoparticles (AgNPs) are uniformly modified on the inner wall of the capillary. GO can provide chemical enhancement by adsorbing the analyte onto its flat surface and producing efficient charge transfer resonance with the analyte. AgNPs can provide strong localized surface plasmon resonance for electromagnetic enhancement, while capillary can shorten the molecular enrichment time and provide long light–analyte interaction length. The synergism of GO, AgNPs, and capillary makes the optofluidic platform have the ability of ultrasensitive and real-time detection. The detection limit of Rhodamine 6G and thiram is as low as 10–12 and 10–10 M, respectively, and the enhancement factor is as high as 0.9 × 1010 and 108, which indicates that the SERS-active capillaries have great potentials in real-time ultratrace detection of water environment pollutants.
研究领域:
材料科学
·
分析化学
·
环境科学
·
光学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Jing Tang,Huimin Sun,Xiuting Li,Fangchu Liang,Tao Jiang
Breaking the limitation of smooth silver nanowires (Ag NWs) in forming sufficient “hot spots” is a crucial step to push them into practical surface enhancement Raman scattering (SERS)-based detection. Herein, Ag NWs with various etched configurations were developed by utilizing different amounts of aqua regia as etchant at room temperature . Compared with the smooth Ag NWs, more electromagnetic “hot spots” were enabled by the etched one, which exhibited better sensitivity and uniformity in SERS signals. The limit of detection (LOD) for 2-naphthalenethiol (2-NAT) obtained from the optimized substrate could reach 8.3 × 10 −10 mol/L and the relative standard deviation (RSD) was 6.8%. The maximum enhancement factor (EF) value obtained as 3.34 × 10 6 was even three times higher than that of the smooth one. Finally, an ultra-sensitive detection of thiram with a lowest detectable concentration of 4 × 10 −8 mol/L was facilitated by the optimal etched Ag NWs.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Qianji Li,Zejia Hao,Chenchen Zhang,Shanhong Ni,Ping Jiang,Pengfei Fan,Lei Li
In this article, a dual-signal sensor for the fluorescence and colorimetric detection of glyphosate (Gly) is developed based on DNAzyme-mediated click chemistry and DNAzyme-regulated CeO2 peroxidase-like activity. DNAzyme can bind to Cu+, triggering a click chemistry reaction between 3-Azido-7-hydroxycoumarin (AHC) and 3-ethyn-1-ol (BOL), thus generating a strong fluorescence signal at 475 nm. Due to the strong coordination between Gly and Cu2+, the amount of reduced Cu+ decreases, resulting in a weakening of the fluorescence. In addition, Gly can inhibit the catalytic site of CeO2 enzyme activity, while DNAzyme, which does not participate in the click chemistry reaction, can be adsorbed by CeO2, further inhibiting the enzyme activity and reducing the oxidation color change of 3,3′,5,5′-tetramethylbenzidine (TMB). The fluorescence detection limit of this dual-mode sensing platform is 0.15 μg/mL, and the colorimetric detection limit is 0.19 μg/mL. This method has been successfully applied to the detection of Gly in tap water and soybeans, which has a promising application in pesticide residue detection.
研究领域:
分析化学
·
生物传感器
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Lijun Wei,Weimin Gan,Mengdie Cai,Hongping Cai,Guowen Zhang,Xianglei Cheng
In this study, S -methyl derivatives of dithiocarbamates (DTCs) were shown to significantly enhance chemiluminescence (CL) between Ce(IV) and efficient and environmentally friendly nitrogen-doped carbon dots (NCDs). Based on the elucidation of the CL mechanisms, an innovative approach involving high-performance liquid chromatography coupled with N-CDs and CL detection (HPLC-CDCL) was proposed. The developed method was successfully applied to the highly sensitive detection of three DTC fungicides (dimethyl dithiocarbamate, ethylene bisdithiocarbamate, and propylene bisdithiocarbamate) in tea. The recovery of the established method ranged 70.51–116.45%, with relative standard deviations (RSD) of <9.40%. The limit of detection (S/N = 3 ) was as low as 0.19 μg/L (as CS 2 ), which is superior to the previous methods and comparable to UPLC-tandem mass spectrometry (MS/MS). Moreover, the proposed approach does not require solid-phase extraction and offers excellent selectivity. This study proposes a novel method for the detection of DTCs in the food safety and environmental fields.
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 7
·1-8
·
IF 2.101
Wu Hua,Zhang Yu,Lu Min,Liu Wenyan,Xu Jian,Yu William W.
Abstract With tunable emission wavelength, high photoluminescence quantum yield, and broad absorption, colloidal quantum dots are attractive for the application in optical fiber as dopants. However, most of the quantum dots have a large overlap between their absorption and photoluminescence spectra, resulting in reabsorption loss which hinders the realization of long-distance waveguides. Therefore, ZnCuInS/ZnSe/ZnS quantum dots with large Stokes shift were proposed to fabricate a liquid-core optical fiber in this work. In this work, ZnCuInS/ZnSe/ZnS QDs with an average size of 3.3 nm were synthesized and the optical properties of the QD-filled fiber were also investigated as a function of fiber length and doping concentration. Compared to the control sample filled with CdSe/CdS/ZnS quantum dots, the ZnCuInS/ZnSe/ZnS quantum dot-based waveguides showed reduced reabsorption and enhanced signal propagation, which demonstrates great potential of large Stokes-shift quantum dots in optical waveguide devices. Graphical Abstract A reduced reabsorption and enhanced propagation of ZnCuInS/ZnSe/ZnS QDs-doped liquid-core optical fiber was achieved due to the large Stokes shift.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 11
·1-9
·
IF 5.833
Chen Shuqin,Huang Mengna,Huang Mianli,Feng Liang
A strategy based on CsPbBr 3 quantum dots (QDs) is described for the determination of ziram pesticide. A facile and inert gas-free method was used for the synthesis of CsPbBr 3 QDs. The obtained CsPbBr 3 QDs displayed turn-off fluorescence behavior for ziram. The fluorescence intensity of the CsPbBr 3 QDs ( E x / E m = 365/516 nm) was inversely proportional to the concentration of ziram (0.10 to 50.0 ppm) with a detection limit of 0.086 ppm. Notably, satisfactory recoveries (100 ± 0.25 to 107 ± 5.72%) were obtained in spiked fruit samples, which demonstrated that this method is capable of detecting ziram in real samples. In addition, the mechanism for the detection of ziram was investigated in detail. According to the results, this mechanism can be tentatively explained by fluorescence quenching originating from the increased surface defects and the structural changes of the CsPbBr 3 QDs. The detection ability of this strategy shows promising applicability in food safety. Graphical abstract
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2023
·
IF 6.1
Yan Guo,Xiaojiao Zheng,Xin Wang,Zhuoting Zhang,Shu Qin,Xiaowen Wang,Xu Jing
A simple, green extraction method of dithiocarbamate (DTC) pesticides in food samples was developed using adhesive tapes and a green deep eutectic solvent (DES). A rapid and convenient determination and distinction method of DTC pesticides was established using tyrosinase inhibition assay. First, DTC pesticides were extracted by pasting and peeling off the adhesive tape, then eluted by the DES synthesized from xylitol and ethylene glycol . Second, determination of DTC pesticides was conducted by inhibiting the activity of tyrosinase which can catalyze the oxidation of catechol . Less colored products were generated in the reaction system (tyrosinase, catechol, and 4-aminoantipyrine), leading to weak absorbance. In addition, different DTC pesticides (ziram, propineb , zineb , mancozeb , thiram , metiram, and ferbam) were successfully distinguished by sensor arrays (tyrosinase, phenolic compounds , and 4-aminoantipyrine) through principal component analysis. The limit of detection was found to be 0.2 μg kg −1 , and the limit of quantification was 0.6 μg kg −1 . The recoveries ranging from 89.4% to 103.8% were obtained in vegetable, fruit, and cereal, with a relative standard deviation of less than 4.2%. The method is simple, rapid, and convenient and shows good application prospects in the determination of pesticides in a variety of food samples.
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 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）