FOOD CHEMISTRY
·
2025
·
IF 9.8
Jia Wu,Huimei Liang,Shulan Zeng,Shulin Zhao,Fanggui Ye
Pesticide residues pose significant risks to consumer health. Therefore, it is essential to develop convenient and practical detection methods. Nanozyme colorimetric sensing is widely used for pesticide detection. However, improving its sensitivity and selectivity remains a major challenge. In this study, a smartphone-assisted portable test swab fabricated using CuWO 4 as the extractant, combined with solid-phase extraction (SPE), was designed for the colorimetric detection of thiram (THR). Based on the specific binding between the Cu sites in CuWO 4 and THR, interference was eliminated after the SPE to improve selectivity. Moreover, the sensitivity improved after SPE enrichment. Additionally, THR enhanced the peroxidase-like activity of CuWO 4 , whereas tungsten as a co-catalyst further boosted the nanozyme activity, thereby improving the detection sensitivity (limit of detection: 19 nM). The experimental results demonstrate that this method exhibits high stability and good selectivity, with recoveries in real samples ranging from 90.8 % to 112.4 %.
研究领域:
分析化学
·
环境科学
·
食品科学
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 13
·2152
·
IF 5.719
Chunhong Zhang,Hao Ren,Xiangkui Jiang,Guangfeng Jia,Zhigang Pan,Yongchun Liu
An aggregation or assembly of Ag triangular nanoplates (Ag TNPs) can cause dramatic changes in their optical properties, which is widely used in applications in the field of sensing. The assembly forms of nanoparticles are crucial for obtaining sensitive sensing signals, but it is unknown what kind of assembly dominates the aggregated Ag TNPs in aqueous solutions. Herein, using thiram-induced Ag TNP aggregation as a model, six different assembly models were established, including three planar (side-by-side, side-to-tip, and tip-to-tip) assemblies and three tridimensional (plane-to-plane, plane-to-tip, and plane-to-side) assemblies. The corresponding optical properties were then investigated. Both theoretical and experimental findings indicate that three-dimensional assemblies, especially plane-to-plane assembly, dominate the Ag TNPs aggregation solution, causing a blue shift of the absorption spectrum. Analysis of charge distribution patterns in Ag TNPs indicates that such a blue shift is caused by the electrostatic repulsive force in plane-to-plane assembly. Thus, we propose a simple colorimetric method for thiram detection using Ag TNPs as an indicator. The method exhibits a selective and sensitive response to thiram with a limit of detection of 0.13 μM in the range of 0.2–0.5 μM, as well as excellent performance in real samples like wheat.Keywords:aggregation;Ag triangular nanoplates;LSPR;colorimetric detection;thiram
研究领域:
材料科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2023
·Vol. 99
·期 5
·1310-1317
·
IF 3.3
Xiaoyi Dai,Zhong Li,Xusheng Shao
Carbendazim (MBC) is a high-efficient and broad-spectrum fungicide, but excessive residues caused by its improper use have caused health toxicity and environmental pollution. It is an irresistible trend to find green, safe, accurate and controllable release technology of MBC. To achieve the purpose of safe and efficient use of MBC, photolabile protecting group was used to realize the controllable release. This study aimed to covalently link MBC and 6-nitropiperonyl alcohol (NP) to synthesize photocaged molecule NP-MBC. The photodegradation test showed that NP-MBC could effectively release MBC under ultraviolet light. The antifungal activity of NP-MBC showed significant difference against Rhizoctonia solani , Sclerotinia sclerotiorum and Fusarium graminearum before and after irradiation, and the effects on mycelial morphology are different. The hyphae morphology of R. solani and F. graminearum changed significantly, and mycelia were severely damaged. The hyphae surface of former was swollen and broken, and the latter was collapsed and shriveled after NP-MBC light treatment. NP-MBC could realize the light-controlled release of MBC, and the antifungal activity before and after irradiation was significantly different, which provides an effective way to release MBC.
研究领域:
植物保护
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环境科学
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产品关联
DOI
PubMed
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2022
·Vol. 75
·期 5
·345-352
·
IF 1.224
Yuzheng Shi,Xicheng Xie,Lumei Wang,Linzheng Wang,Lingyun Li,Zhiyu Yan,Guoqing Shen,Yuzheng Shi,Xicheng Xie,Lumei Wang,Linzheng Wang,Lingyun Li,Zhiyu Yan,Guoqing Shen
This paper describes a fluorometric assay for the determination of carbendazim (CBZ) in aqueous samples based on an unmodified CBZ-specific aptamer and the fluorescent intercalator SYBR Green I (SG-I). The CBZ aptamer has double-stranded parts and G-quadruplex spatial structures, which can be recognized by SG-I. It leads to strong fluorescent emission of SG-I. In the presence of CBZ, the aptamer will bind to CBZ to form stable compounds due to its specific affinity. This will induce the conformational change of the aptamer. SG-I will then detach from the aptamer, leading to the decrease of its fluorescence. Therefore, the concentration of CBZ is determined through the changes in fluorescence of the system. This fluorometric biosensor for CBZ detection is constructed with a linear range from 3.58 to 230 nM with a limit of detection (LOD) of 3.58 nM. With great sensitivity and selectivity, this assay is efficient and convenient with a < 40 min operation time. Meanwhile, the average recovery of CBZ is 99.87–101.77% in the application of actual water samples with relative standard deviations (RSD) ranging from 1.97 to 2.63%.
研究领域:
分析化学
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环境科学
·
生物技术
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Waseem Hayat,Yongqing Zhang,Ze-hua Liu,Xiaodong Du
The high leachability and solubility of methomyl (MET; C 5 H 10 N 2 O 2 S) result in water pollution; while, the polluted water channels can be depolluted by environmentally-friendly and highly-effective degradation technique. Therefore, MET degradation in water by peroxydisulfate (PDS) oxidation was investigated in this study employing the two most naturally-abundant iron species i.e. pyrite (PyR) and zero-valent iron (ZVI) as activators for PDS activation. The experiments were conducted at different activators’ dosage, pollutant concentration, oxidant concentration, initial pH and initial temperature for comparative assessment of degradation-efficiencies of PyR/PDS and ZVI/PDS systems. Using 0.25 g/L PyR/ZVI and 1.0 mmol/L PDS, PyR/PDS and ZVI/PDS systems respectively led to 98.8 % and 97.5 % degradation of 20.0 mg/L MET in 20 min, which became rapid by increasing the activators’ dosage and oxidant concentration in both systems. Further, the degradation has been more than 90.0 % at initial pH 3.0 to 11.0, which slowed with increasing the MET concentration in two systems. The free-radicals quenching analysis showed that degradation by PyR/PDS system was mainly executed by sulfate (SO 4 •− ) and hydroxyl ( • OH) radicals; while, SO 4 •− and super oxide radical anion (O 2 •− ) were dominant during degradation by ZVI/PDS system. PyR/PDS system had low stability and applicability, which supports the employment of ZVI/PDS system for efficient degradation of MET in water.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Shuang Gao,Xiaoming Li,Jingyu Jiang,Lixia Zhao,Ying Fu,Fei Ye
Thiophanate methyl/hydroxypropyl-beta-cyclodextrin (TM/HP β CD) inclusion complex nanofibers were prepared using electrospinning. The FT-IR, 1H NMR and XRD spectra manifested that TM entered the cavity of HP β CD, which confirmed the formation of the TM/HP β CD inclusion complex. The TGA results indicated that the thermostability of the TM/HP β CD nanofibers was higher than that of the original TM, and the phase-solubility test demonstrated that the inclusion of HP β CD promoted the water solubility of TM. The morphology analysis proved that beadless and homogeneous nanofibers were successfully elesctrospun. Moreover, the dissolution behavior demonstrated the fast-dissolving character of the TM/HP β CD nanofibers. Molecular modeling showed the effective binding of host and guest molecules. In addition, the TM/HP β CD nanofibers showed better antifungal activity than the original TM. In brief, the fabrication of inclusion complex nanofibers could enhance the dissolvability in water, thermostability and fungicidal activity of TM, which exhibited potential in reducing the environmental damage caused by TM and offered an environmentally safe process for the application of TM.
研究领域:
农业科学
·
材料科学
✓ 已验证
DOI
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Shunqian Zhuang,Jun Cheng,Songting Chen,Yuliang Li,Dazhi Ding,Zhilong Yu,Yunfei Xie
Lotus leaf is a super-hydrophobic material found in nature. Drawing inspiration from the micro-nano structure of lotus leaf surface, a hybrid surface-enhanced Raman spectroscopy (SERS) substrate owning both hydrophobic and hydrophilic properties was developed. The biomimetic part, which was fabricated by replicating the surface structure of lotus leaf using polydimethylsiloxane, exhibited a hydrophobic surface with a contact angle of 150.3°. Meanwhile, silver nanoparticles-coated filter paper was assembled on the top of the biomimetic part to render hydrophilic regions for SERS detection. Silver nanoparticles on the surface of filter paper owned a size of approximately 70–80 nm with an interval of about 5–10 nm. The hydrophobic/hydrophobic hybrid regions on the substrate significantly enhanced Raman signals of rhodamine 6g with mitigated coffee ring effects, showing a limit of detection low to 10 −10 M. Notably, the limit of detection of this technique for thiram on apple surface reached 0.5 ng/cm 2 , which was lower than the reported methods. The prepared substrate displayed exceptional uniformity and stability, with an RSD value of 7.21% calculated based upon 30 randomly selected Raman signals, and experienced a decrease in signal by only 29.7% after 30-d storage. This biomimetic substrate can be utilized for batch detection of pesticide residues on fresh produce with high sensitivity, thereby owning great potential for application as a rapid detection tool for food safety.
研究领域:
分析化学
·
食品安全
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Toxics
·
2023
·Vol. 11
·期 4
·326
·
IF 4.6
Xiaoran Ma,Xin Chen,Haonan Hou,Donghui Liu,Xueke Liu,Peng Wang,Zhiqiang Zhou
As two commonly used fungicides, carbendazim and tebuconazole are widely found in the environment and in foods. Studies have reported that these fungicides can induce hepatic oxidative stress and other health risks. Nevertheless, the influences of exposure to carbendazim and tebuconazole at their acceptable daily intake (ADI) doses on hepatic oxidative stress, and the residual distributions in mice remain unclear. To fill these gaps, ICR (CD-1) mice were exposed to carbendazim and tebuconazole at their ADI doses by oral administration for 4 weeks in this study. The results showed that tebuconazole accumulated primarily in the epididymal fat of mice (16.84 μg/kg), whereas no significant residues of carbendazim in the tissues were observed. In addition, exposure to ADI doses of tebuconazole significantly reduced liver coefficients and induced hepatic oxidative stress in mice, including elevating the levels of glutathione and malonaldehyde. However, no significant impacts were observed on the hepatic redox homeostasis in mice after exposure to carbendazim at its ADI dose. The results could be helpful for understanding the exposure risks of carbendazim and tebuconazole in terms of low doses and long term.Keywords:carbendazim;tebuconazole;residue;oxidative stress;acceptable daily intake
研究领域:
毒理学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2016
·
IF 2.857
Chuanzhou Liang,Junxing Huang,Xu Zhang
The adsorption coefficient of racemic metalaxyl onto an agriculture soil was small and nonenantioselective. Biotransformation was the predominant pathway for the elimination of R-metalaxyl, while abiotic and biotransformation made a comparable contribution to the degradation of S-metalaxyl. Metalaxyl acid was the main transformation intermediate. The enantiomer fraction of metalaxyl decreased with an increase in its initial spike concentration or the presence of the co-constituents in metalaxyl commercial products. Under simulated solar irradiation, the presence of TiO2 promoted the overall transformation kinetics through enhanced biotransformation and extra photoinduced chemical reactions. The promotion was enantioselective and thereafter changed the enantiomer fraction. The results obtained in this study showed that some achiral parameters, although they have no direct impact on enantioselective reactions with enantiomers, can significantly affect the enantioselective transformation of racemic metalaxyl. Thus, our results indicate that the contribution of chemical interactions on the enantioselective transformation of chiral pesticides may be underestimated.
研究领域:
环境科学
·
农业科学
✓ 已验证
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Tao Wang,Shuang Zhang,Dongling Wu,Maohua Li,Yalan He,Yunpeng Shen
The polyol reduction method has performed well in Ag nanocube (AgNC) synthesis but is hindered by high-temperature requirements, impacting environmental sustainability and economy. Using polyethylene glycol (PEG)/deionized water as a solvent mitigates these issues, by leveraging PEG’s high solubility, bio-compatibility, low cost, and redox properties. The synthesis conditions were optimized, resulting in relatively uniform AgNC. The synthetic AgNC were loaded on porous, cheap, flexible and biocompatible filter paper (FP) by a simple self-assembly, and the formed flexible substrate (AgNC@FP) was used for surface-enhanced Raman scattering (SERS) detection. The AgNC@FP substrate had a high enhancement factor (EF) of 9.8 × 10 7 , with a detection limit of Rhodamine 6G (R6G) of 5.2 × 10 -12 M. Meanwhile, the substrate showed good reproducibility and stability, with a relative standard deviation (RSD) of 5.9 % and a decrease in Raman signal strength of only 25 % after 30 days. Furthermore, the direct sampling of apples and pears from their surface thereby enables the rapid identification of ultra-low thiram residue concentrations, with a sensitivity of 8.3 × 10 -7 M. The high SERS enhancement factor and sensitivity were attributed to the result of the high hot spot density generated by the FP surface, excellent uniformity and superior sample collection efficiency. It can therefore be concluded that this flexible AgNC@FP substrate, which is manufactured at a low cost and allows for label-free SERS detection, represents a promising SERS platform for analytical and biosensing applications.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xu Zhao,Deshuai Kong,Rui Jin,Hongxia Li,Xu Yan,Fangmeng Liu,Peng Sun,Yuan Gao,Geyu Lu
The rapid and on-site monitoring of thiram is of great significance because the residue of thiram in agriculture has caused great contamination in environment and food, as well as threaten to the human health. Herein, we constructed a fluorometric strategy for on-site monitoring thiram via the aggregation-induced emission enhancement (AIEE) effect of glutathione-capped gold nanoclusters (GSH-AuNCs). The dissociated Ag + ions can effectively enhance the fluorescent emission intensity of GSH-AuNCs at 570 nm owing to the AIEE phenomenon. Upon the addition of thiram, the fluorescence enhancement effect was weakened due to the strong coordinative interaction between Ag + and thiram. By monitoring the signal change, the thiram residues were quantitatively analyzed with the detection limit of 0.05 μg mL −1 . Notably, a home-made electronic-eye (E-eye) system, containing of a test-strip and a smartphone, was constructed as a portable platform to recognize and quantitatively analyze thiram in 10 min on the basis of captured fluorescence signals from a test strip with immobilized probe by direct photographing, which provides a direct quantitative tool to identify pesticide. Taking advantage of user-friendliness, portability and simplicity, the E-eye system are expected to fulfill the demand for quantitative on-site testing of pesticide especially in resource-limited areas.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Jian Zhu,Shuang Zhang,Guo-jun Weng,Jian-jun Li,Jun-wu Zhao
By using gold nanorods with silver coating as the sacrificial templates, we prepared spiky yolk-shell AuAg bimetallic nanorods with uniform interior gap via galvanic replacement reaction. The length and number of Au tips of the spiky yolk-shell AuAg nanorods can be tuned simultaneously by altering HAuCl 4 volume. The influence of HAuCl 4 volume and the sliver layer thickness on the SERS activity of spiky yolk-shell AuAg nanorods are studied. When the sliver layer is thin, the interior gap has not been shielded completely and the outer shell has obvious tips, thus the surface-enhanced Raman scattering (SERS) activity has the strongest enhancement with an enhancement factor (EF) of 4.9 × 10 5 . The spiky yolk-shell AuAg nanorods with the strongest SERS activity are used as SERS substrates to detect thiram. The results demonstrate that the SERS intensity increases linearly with the logarithmic concentration of thiram in the range of 10 −3 M to 10 −7 M. The detection limit is as low as 97 nM, which is lower than the maximum pesticide residue limit (29 µM) in fruits stipulated by the US Environmental Protection Agency (EPA). Therefore, the spiky yolk-shell AuAg bimetallic nanorods have important practical application value in pesticide detection.
研究领域:
材料科学
·
分析化学
·
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）